@ARTICLE
Lumet, E., Jaravel, T., Rochoux, M., Vermorel, O. and Lacroix, S. (2024) Assessing the Internal Variability of Large-Eddy Simulations for Microscale Pollutant Dispersion Prediction in an Idealized Urban Environment, Boundary-Layer Meteorology, 190 (9) , doi: 10.1007/s10546-023-00853-7
[bibtex]
@ARTICLE{AR-CMGC-24-7,
author = {Lumet, E. and Jaravel, T. and Rochoux, M. and Vermorel, O. and Lacroix, S. },
title = {Assessing the Internal Variability of Large-Eddy Simulations for Microscale Pollutant Dispersion Prediction in an Idealized Urban Environment},
year = {2024},
number = {9},
volume = {190},
doi = {10.1007/s10546-023-00853-7},
journal = {Boundary-Layer Meteorology}}
de Nardi, L., Douasbin, Q., Vermorel, O. and Poinsot, T. (2024) Infinitely Fast Heterogeneous Catalysis Model for Premixed Hydrogen Flame-Wall Interaction, Combustion and Flame, 261, pp. Article number 113328, doi: 10.1016/j.combustflame.2024.113328
[bibtex]
@ARTICLE{AR-CFD-24-9,
author = {de Nardi, L. and Douasbin, Q. and Vermorel, O. and Poinsot, T. },
title = {Infinitely Fast Heterogeneous Catalysis Model for Premixed Hydrogen Flame-Wall Interaction},
year = {2024},
volume = {261},
pages = {Article number 113328},
doi = {10.1016/j.combustflame.2024.113328},
journal = {Combustion and Flame}}
Vanbersel, B., Meziat-Ramirez, F., Mohanamuraly, P., Staffelbach, G., Jaravel, T., Douasbin, Q., Dounia, O. and Vermorel, O. (2024) A Systematic Adaptive Mesh Refinement Method for Large Eddy Simulation of Turbulent Flame Propagation, Flow Turbulence and Combustion, doi: 10.1007/s10494-024-00534-6
[bibtex]
@ARTICLE{AR-CFD-24-25,
author = {Vanbersel, B. and Meziat-Ramirez, F. and Mohanamuraly, P. and Staffelbach, G. and Jaravel, T. and Douasbin, Q. and Dounia, O. and Vermorel, O. },
title = {A Systematic Adaptive Mesh Refinement Method for Large Eddy Simulation of Turbulent Flame Propagation},
year = {2024},
doi = {10.1007/s10494-024-00534-6},
journal = {Flow Turbulence and Combustion}}
Barleon, N., Cheng, L., Cuenot, B., Vermorel, O. and Bourdon, A. (2023) Investigation of the impact of NRP discharge frequency on the ignition of a lean methane-air mixture using fully coupled plasma-combustion numerical simulations, Proceedings of the Combustion Institute, 39 (4) , pp. 5521-5530, doi: 10.1016/j.proci.2022.07.046
[bibtex]
@ARTICLE{AR-CFD-23-88,
author = {Barleon, N. and Cheng, L. and Cuenot, B. and Vermorel, O. and Bourdon, A. },
title = {Investigation of the impact of NRP discharge frequency on the ignition of a lean methane-air mixture using fully coupled plasma-combustion numerical simulations},
year = {2023},
number = {4},
volume = {39},
pages = {5521-5530},
doi = {10.1016/j.proci.2022.07.046},
journal = {Proceedings of the Combustion Institute},
abstract = {The ignition of an atmospheric pressure laminar premixed methane/air mixture by Nanosecond Repetitively Pulsed (NRP) discharges in a pin-pin configuration is studied using fully coupled plasma-combustion numerical simulations. These simulations are performed using the AVIP code specifically developed for low temperature plasma modeling and coupled to the combustion code AVBP. A reduced chemical scheme for plasma-assisted combustion previously derived and validated is used to investigate the effect of the frequency of NRP discharges and the benefits of their chemical enhancement. It is observed that the induced shock wave produced by strong discharges is of major importance for ignition and can lead to quenching of the ignition kernels through strong induced recirculation of gases. Increasing the frequency of the discharges reduces this effect by depositing less energy at each discharge and accumulating energy more homogeneously between the electrodes, leading to a faster and more stable ignition. The minimum energy necessary to ignite decreases with increasing frequency and at the highest studied frequency (100 kHz) ignition has been achieved with 30% less energy than with a single-pulse discharge.},
keywords = {NRP Discharge, Plasma-assisted combustion, Ignition, Detailed simulations}}
Villafana, W., Cuenot, B. and Vermorel, O. (2023) 3D particle-in-cell study of the electron drift instability in a Hall Thruster using unstructured grids, Physics of Plasmas, 30 (3) , pp. Article number 033503, doi: 10.1063/5.0133963
[bibtex]
@ARTICLE{AR-CFD-23-62,
author = {Villafana, W. and Cuenot, B. and Vermorel, O. },
title = {3D particle-in-cell study of the electron drift instability in a Hall Thruster using unstructured grids},
year = {2023},
number = {3},
volume = {30},
pages = {Article number 033503},
doi = {10.1063/5.0133963},
journal = {Physics of Plasmas}}
Barleon, N., Cheng, L., Cuenot, B. and Vermorel, O. (2023) A phenomenological model for plasma-assisted combustion with NRP discharges in methane-air mixtures: PACMIND, Combustion and Flame, 253, pp. Article number 112794, doi: 10.1016/j.combustflame.2023.112794
[bibtex]
@ARTICLE{AR-CFD-23-76,
author = {Barleon, N. and Cheng, L. and Cuenot, B. and Vermorel, O. },
title = {A phenomenological model for plasma-assisted combustion with NRP discharges in methane-air mixtures: PACMIND},
year = {2023},
volume = {253},
pages = {Article number 112794},
doi = {10.1016/j.combustflame.2023.112794},
journal = {Combustion and Flame}}
Barleon, N., Cuenot, B. and Vermorel, O. (2023) Large-Eddy Simulation of swirled flame stabilisation using NRP discharges at atmospheric pressure, Applications in Energy and Combustion Science, 15, pp. Article number 100163, doi: 10.1016/j.jaecs.2023.100163
[bibtex]
@ARTICLE{AR-CFD-23-84,
author = {Barleon, N. and Cuenot, B. and Vermorel, O. },
title = {Large-Eddy Simulation of swirled flame stabilisation using NRP discharges at atmospheric pressure},
year = {2023},
volume = {15},
pages = {Article number 100163},
doi = {10.1016/j.jaecs.2023.100163},
journal = {Applications in Energy and Combustion Science}}
Cheng, L., Barleon, N., Vermorel, O., Cuenot, B. and Bourdon, A. (2022) AVIP: a low temperature plasma code, pp. arXiv e-print 2201.01291
[bibtex]
[url] [pdf]
@ARTICLE{AR-CFD-22-6,
author = {Cheng, L. and Barleon, N. and Vermorel, O. and Cuenot, B. and Bourdon, A. },
title = {AVIP: a low temperature plasma code},
year = {2022},
pages = {arXiv e-print 2201.01291},
abstract = {A new unstructured, massively parallel code dedicated to low temperature plasmas, AVIP, is presented to simulate plasma discharges in interaction with combustion. The plasma species are modeled in a drift-diffusion formulation and the Poisson equation is solved consistently with the charged species. Plasma discharges introduce stiff source terms on the reactive Navier-Stokes equations and Riemann solvers, more robust than the schemes available in AVBP, have been implemented in AVIP and reported back in AVBP to solve the reactive Navier-Stokes equations. The validation of all the numerical schemes is carried out in this paper where numerous validation cases are presented for the plasma drift-diffusions equations and the reactive Navier-Stokes equations},
pdf = {https://cerfacs.fr/wp-content/uploads/2022/01/CFD_papier_AVIP_arxiv_Barleon.pdf},
url = {https://arxiv.org/abs/2201.01291}}
Cheng, L., Barleon, N., Cuenot, B., Vermorel, O. and Bourdon, A. (2022) Plasma assisted combustion of methane-air mixtures: Validation and reduction, Combustion and Flame, 240 (111990) , doi: 10.1016/j.combustflame.2022.111990
[bibtex]
[url]
@ARTICLE{AR-CFD-22-26,
author = {Cheng, L. and Barleon, N. and Cuenot, B. and Vermorel, O. and Bourdon, A. },
title = {Plasma assisted combustion of methane-air mixtures: Validation and reduction},
year = {2022},
number = {111990},
volume = {240},
doi = {10.1016/j.combustflame.2022.111990},
journal = {Combustion and Flame},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0010218022000098}}
Dounia, O., Jaravel, T. and Vermorel, O. (2022) On the controlling parameters of the thermal decomposition of inhibiting particles: A theoretical and numerical study, Combustion and Flame, 240, pp. 111991, doi: 10.1016/j.combustflame.2022.111991
[bibtex]
@ARTICLE{AR-CFD-22-72,
author = {Dounia, O. and Jaravel, T. and Vermorel, O. },
title = {On the controlling parameters of the thermal decomposition of inhibiting particles: A theoretical and numerical study},
year = {2022},
volume = {240},
pages = {111991},
doi = {10.1016/j.combustflame.2022.111991},
journal = {Combustion and Flame}}
Jaravel, T., Dounia, O., Malé, Q. and Vermorel, O. (2021) Deflagration to detonation transition in fast flames and tracking with chemical explosive mode analysis, Proceedings of the Combustion Institute, 38 (3) , pp. 3529-3536, doi: 10.1016/j.proci.2020.09.020
[bibtex]
[url]
@ARTICLE{AR-CFD-21-3,
author = {Jaravel, T. and Dounia, O. and Malé, Q. and Vermorel, O. },
title = {Deflagration to detonation transition in fast flames and tracking with chemical explosive mode analysis},
year = {2021},
number = {3},
volume = {38},
pages = {3529-3536},
doi = {10.1016/j.proci.2020.09.020},
journal = {Proceedings of the Combustion Institute},
abstract = {In the context of vapour cloud explosion, the flame acceleration process can lead to conditions promoting deflagration to detonation transition (DDT), potentially leading to increased damages in accidental scenarios. This study focuses on this phenomenon by performing simulations of detonation reinitiation for fast flames in the Chapman-Jouguet deflagration regime. It is obtained experimentally by the attenuation of an incident detonation by an array of obstacles. A primary objective of the paper is to demonstrate the ability of the numerical model to reproduce the major experimental trends, namely the variation of the reinitiation propensity for different initial pressures and blockage ratios (BRs). Chemical explosive mode analysis (CEMA) is also adapted to the context of this study, in order to identify locally the propagation regime and to provide insights on the reinitiation mechanism. An \textit{a priori} validation of the CEMA methodology is first performed on relevant canonical one-dimensional configurations. Subsequently, ensembles of five realizations are computed at different initial pressures and BRs and compared to experimental data. They are shown to reproduce the major observed trends in terms of detonation reinitiation length with respect to the operating conditions, with significant variability from one realization to another. In addition, the reinitiation mechanism is also found to be consistent with experimental observations and a previous numerical study of the same configuration. The CEMA methodology adapted to this context is able to identify locally the different propagation regimes, and to track the highly reactive zones that coherently couple with transverse pressure perturbations, leading to the formation of a strongly reacting kernel which eventually triggers the detonation reinitiation. },
keywords = {Fast flame, detonation, deflagration to detonation transition, chemical explosive mode analysis},
url = {https://www.sciencedirect.com/science/article/abs/pii/S1540748920306817}}
Dounia, O., Vermorel, O., Jaravel, T. and Poinsot, T. (2021) Time scale analysis of the homogeneous inhibition/suppression of premixed flames by alkali metals, Proceedings of the Combustion Institute, 38 (2) , pp. 2371-2378, doi: 10.1016/j.proci.2020.06.030
[bibtex]
[url]
@ARTICLE{AR-CFD-21-4,
author = {Dounia, O. and Vermorel, O. and Jaravel, T. and Poinsot, T. },
title = {Time scale analysis of the homogeneous inhibition/suppression of premixed flames by alkali metals},
year = {2021},
number = {2},
volume = {38},
pages = {2371-2378},
doi = {10.1016/j.proci.2020.06.030},
journal = {Proceedings of the Combustion Institute},
abstract = {A time scale analysis of the homogeneous flame inhibition problem is carried out to identify the main parameters controlling the gas phase chemical interaction of the alkali metal inhibitors with the flame chemistry. First, submodels for the interaction of alkali metals with the flame are analyzed to show that a simplified 2-step inhibition cycle can capture the essential features of this interaction. Second, it is shown that this cycle is auto-catalytic, which explains the high efficiency of alkali metals in inhibiting flames even at low concentrations. Third, the time scales associated to this inhibition cycle are linked to the free flame termination time scale via a non-dimensional parameter characterizing the efficiency of an inhibitor at promoting radical scavenging. It is shown that this parameter accounts for the main trends observed in the literature and can also be used to provide estimates for the chemical flame suppression limit.
},
keywords = {homogeneous flame inhibition, alkali metals, laminar flames},
url = {https://www.sciencedirect.com/science/article/abs/pii/S1540748920300560}}
Malé, Q., Vermorel, O., Ravet, F. and Poinsot, T. (2021) Jet Ignition Prediction in a Zero-Dimensional Pre-Chamber Engine Model, International Journal of Engine Research, pp. 14680874211015002, doi: 10.1177/14680874211015002
[bibtex]
[url]
@ARTICLE{AR-CFD-21-61,
author = {Malé, Q. and Vermorel, O. and Ravet, F. and Poinsot, T. },
title = {Jet Ignition Prediction in a Zero-Dimensional Pre-Chamber Engine Model},
year = {2021},
pages = {14680874211015002},
doi = {10.1177/14680874211015002},
journal = {International Journal of Engine Research},
abstract = {This paper presents a multi-chamber, multi-zone engine model to predict the ignition
of a lean main chamber by a pre-chamber. The two chambers are connected by
small cylindrical holes: the flame is ignited in the pre-chamber, hot gases propagate
through the holes and ignite the main chamber through Turbulent Jet Ignition (TJI).
The model original features are: i) separate balance equations for the pre- and main
chambers, ii) a specific model for temperature and composition evolution in the
holes and iii) a DNS-based model 1 to predict the ignition of the main chamber
fresh gases by the burnt gases turbulent jets exiting the holes. Chemical reactions
during TJI are the result of two competing mixing processes: (1) the hot jet gases
mix with the fresh main chamber to produce heated zones and (2) at the same time,
these hot gases cool down. (1) increases combustion and leads to ignition while (2)
decreases it and can prevent ignition. The overall outcome (ignition or failure) is
too complex to be modelled simply and the present model relies on recent DNSs of
TJI1 which provided a method to predict the occurrence of ignition. Incorporating
this DNS information into the engine model allows to predicts whether ignition will
occur or not, an information which is not accessible otherwise using simple models.
The resulting approach is tested on multiple cases to predict ignition limits for very
lean cases, e↵ects of H2 injection into the pre-chamber and optimum size for the
holes connecting the two chambers as a function of equivalence ratio.},
keywords = {turbulent jet ignition, pre-chamber ignition, internal combustion engine, multi-zone engine model},
url = {https://doi.org/10.1177/14680874211015002}}
Villafana, W., Petronio, F., Denig, A., Jimenez, J.M., Eremin, D., Garrigues, L., Taccogna, F., Alvarez Laguna, A., Boeuf, J.P., Bourdon, A., Chabert, P., Charoy, T., Cuenot, B., Hara, K., Pechereau, F., Smolyakov, A., Sydorenko, D., Tavant, A. and Vermorel, O. (2021) 2D radial-azimuthal particle-in-cell benchmark for E x B discharges, Plasma Sources Science and Technology, 30 (7) , pp. 075002, doi: 10.1088/1361-6595/ac0a4a
[bibtex]
[url]
@ARTICLE{AR-CFD-21-73,
author = {Villafana, W. and Petronio, F. and Denig, A. and Jimenez, J.M. and Eremin, D. and Garrigues, L. and Taccogna, F. and Alvarez Laguna, A. and Boeuf, J.P. and Bourdon, A. and Chabert, P. and Charoy, T. and Cuenot, B. and Hara, K. and Pechereau, F. and Smolyakov, A. and Sydorenko, D. and Tavant, A. and Vermorel, O. },
title = {2D radial-azimuthal particle-in-cell benchmark for E x B discharges},
year = {2021},
number = {7},
volume = {30},
pages = {075002},
doi = {10.1088/1361-6595/ac0a4a},
journal = {Plasma Sources Science and Technology},
abstract = {In this paper we propose a representative simulation test-case of E x B discharges accounting for plasma wall interactions with the presence of both the Electron Cyclotron Drift Instability (ECDI) and the Modified-Two-Stream-Instability(MTSI). Six independently developed Particle-In-Cell (PIC) codes have simulated this benchmark case, with the same specified conditions. The characteristics of the different codes and computing times are given. Results show that both instabilities were captured in a similar fashion and good agreement between the different PIC codes is reported as main plasma parameters were closely related within a 5% interval.The number of macroparticles per cell was also varied and statistical convergence was reached. Detailed outputs are given in the supplementary data, to be used by other similar groups in the perspective of code verification.},
keywords = {benchmark, modified two-stream instability, electron cycloton drift instability, plasma-wall interactions, ExB discharges, particle-in-cell},
url = {https://iopscience.iop.org/article/10.1088/1361-6595/ac0a4a}}
Joncquières, V., Vermorel, O. and Cuenot, B. (2020) A fluid formalism for low-temperature plasma flows dedicated to space propulsion in an unstructured High Performance Computing solver, Plasma Sources Science and Technology, 29 (9) , pp. 095005, doi: 10.1088/1361-6595/ab62d8
[bibtex]
[url]
@ARTICLE{AR-CFD-20-41,
author = {Joncquières, V. and Vermorel, O. and Cuenot, B. },
title = {A fluid formalism for low-temperature plasma flows dedicated to space propulsion in an unstructured High Performance Computing solver},
year = {2020},
number = {9},
volume = {29},
pages = {095005},
doi = {10.1088/1361-6595/ab62d8},
journal = {Plasma Sources Science and Technology},
abstract = {With the increased interest in electric propulsion for space applications,
a wide variety of electric thrusters have emerged. For many years, Hall e ect thrusters
have been the selected technology to sustain observation and telecommunication satel-
lites thanks to their advantageous service lifetime, their high speci c impulse and high
power to thrust ratio. Despite several studies on the topic, the Hall thruster electric
discharge remains still poorly understood. With the increase of available computing
resources, numerical simulation becomes an interesting tool in order to explain some
complex plasma phenomena. In this paper, a
uid model for plasma
ows is presented
for the numerical simulation of space thrusters. Fluid solvers often exhibit strong hy-
potheses on electron dynamics via the drift-di usion approximation. Some of them use
a quasi-neutral assumption for the electric eld which is not adapted near walls due
to the presence of sheaths. In the present model, all these simpli cations are removed
and the full set of plasma equations is considered for the simulation of low-temperature
plasma
ows inside a Hall thruster chamber. This model is implemented in the un-
structured industrial solver AVIP, ecient on large clusters and adapted to complex
geometries. Electrical sheaths are taken into account as well as magnetic eld and
majors collision processes. A particular attention is paid on a precise expression of the
di erent source terms for elastic an inelastic processes. The whole system of equations
with adapted boundary conditions is challenged with a simulation of a realistic 2D
r-z Hall thruster con guration. The full-
uid simulation exhibits a correct behavior
of plasma characteristics inside a Hall e ect thruster. Comparisons with results from
the literature exhibit a good ability of AVIP to model the plasma inside the ionization
chamber. Finally a speci c attention was brought to the analysis of the thruster per-
formances.},
keywords = {Hall effect thruster, 10-moment fluid model, 2D r-z simulation, unstructured formalism, AVIP},
url = {https://iopscience.iop.org/article/10.1088/1361-6595/ab62d8/meta}}
Rochette, B., Riber, E., Vermorel, O. and Cuenot, B. (2020) A generic and self-adapting method for flame detection and thickening in the Thickened Flame model, Combustion and Flame, 212 (February 2020) , pp. 448-458, doi: 10.1016/j.combustflame.2019.11.015
[bibtex]
@ARTICLE{AR-CFD-20-22,
author = {Rochette, B. and Riber, E. and Vermorel, O. and Cuenot, B. },
title = {A generic and self-adapting method for flame detection and thickening in the Thickened Flame model},
year = {2020},
number = {February 2020},
volume = {212},
pages = {448-458},
doi = {10.1016/j.combustflame.2019.11.015},
journal = {Combustion and Flame},
abstract = {A generic and self-adapting method for flame front detection and thickening is presented. This approach relies solely on geometric considerations and unlike previous thickening methods does not need any parameterization nor preliminary calibration. The detection process is based on the analysis of the curvature of a test function, associating a bell-curve shape to a flame front. Once the front is located, the front thickness is also evaluated from the test function, allowing (1) a thickening restricted to under-resolved flame regions, (2) a self-adapting thickening of the front. The thickening process is finally applied to the detected front, over a normal-to-the-flame distance, using a Lagrangian point-localization algorithm. The method was developed and implemented in an unstructured and massively parallel environment and is therefore directly usable for the computation of complex configurations. Three test cases are presented to validate the methodology, ranging from a
one-dimensional laminar premixed flame to the VOLVO turbulent premixed flame.},
keywords = {COMBUSTION}}
Malé, Q., Vermorel, O., Ravet, F. and Poinsot, T. (2020) Direct numerical simulations and models for hot burnt gases jet ignition Author links open overlay panel, Combustion and Flame, 223, pp. 407-422, doi: 10.1016/j.combustflame.2020.09.017
[bibtex]
@ARTICLE{AR-CFD-20-126,
author = {Malé, Q. and Vermorel, O. and Ravet, F. and Poinsot, T. },
title = {Direct numerical simulations and models for hot burnt gases jet ignition Author links open overlay panel},
year = {2020},
volume = {223},
pages = {407-422},
doi = {10.1016/j.combustflame.2020.09.017},
journal = {Combustion and Flame},
abstract = {This work uses multiple three-dimensional Direct Numerical Simulations (DNSs) to i) investigate the ignition process of a cold lean premixed mixture at atmospheric conditions by a jet of hot burnt gases that may be cooled before injection ii) evaluate models able to predict the outcome of such a scenario in terms of ignition. Understanding and being able to model ignition of cold premixed mixtures by hot burnt gases is essential to design systems like engines (to ensure ignition) and flameproof enclosures (to prevent ignition). Limited work has focused on the combined effects of the jet injection speed and temperature on ignition. This is difficult to do by using experiments only and DNS is a natural approach to gain knowledge on that point. By varying the hot jet injection speed and temperature, the three-dimensional, kinetically detailed, DNSs allow a parametric study of the impact of these parameters on the ignition process and provide data to build and test models. Simulations prove that jet injection speed and temperature (usually less than the adiabatic flame temperature because of cooling effects through the injection hole) directly govern ignition. Chemical Explosive Mode Analysis (CEMA) is used to characterize the reacting flow structure which is strongly impacted by the jet injection speed. Based on the DNSs conclusions, a zero-dimensional Lagrangian model where a small element of the jet burnt gases mixes at a certain rate with the fresh gases while it potentially ignites is found to be a good candidate to predict the outcome of an ignition sequence (success or failure).},
keywords = {Turbulent jet ignition, Pre-chamber ignition,Internal combustion engine,Flameproof enclosure}}
Collin-Bastiani, F., Vermorel, O., Lacour, C., Lecordier, B. and Cuenot, B. (2019) DNS of spark ignition using Analytically Reduced Chemistry including plasma kinetics, Proceedings of the Combustion Institute, 37 (4) , pp. 5057-5064, doi: 10.1016/j.proci.2018.07.008
[bibtex]
[url]
@ARTICLE{AR-CFD-19-26,
author = {Collin-Bastiani, F. and Vermorel, O. and Lacour, C. and Lecordier, B. and Cuenot, B. },
title = {DNS of spark ignition using Analytically Reduced Chemistry including plasma kinetics},
year = {2019},
number = {4},
volume = {37},
pages = {5057-5064},
doi = {10.1016/j.proci.2018.07.008},
journal = {Proceedings of the Combustion Institute},
abstract = {In order to guarantee good re-ignition capacities in case of engine failure during flight, it is of prime interest for engine manufacturers to understand the physics of ignition from the spark discharge to the full burner lightning. During the ignition process, a spark plug delivers a very short and powerful electrical discharge to the mixture. A plasma is first created before a flame kernel propagates. The present work focuses on this still misunderstood first instants of ignition, i.e., from the sparking to the flame kernel formation. 3D Direct Numerical Simulations of propane-air ignition sequences induced by an electric discharge are performed on a simple anode-cathode set-up. An Analytically Reduced Chemistry (ARC) including 34 transported species and 586 irreversible reactions is used to describe the coupled combustion and plasma kinetics. The effect of plasma chemistry on the temperature field is found to be non-negligible up to a few microseconds after the spark due to endothermic dissociation and ionization reactions. However, its impact on the subsequent flame kernel development appears to be weak in the studied configuration. This tends to indicate that plasma chemistry does not play a key role in ignition and may be omitted in numerical simulations.},
keywords = {Spark ignition, Plasma kinetics, Analytically Reduced Chemistry},
url = {https://doi.org/10.1016/j.proci.2018.07.008}}
Dounia, O., Vermorel, O., Misdariis, A. and Poinsot, T. (2019) Influence of kinetics on DDT simulations, Combustion and Flame, 200 (february) , pp. 1-14, doi: 10.1016/j.combustflame.2018.11.009
[bibtex]
[url]
@ARTICLE{AR-CFD-19-44,
author = {Dounia, O. and Vermorel, O. and Misdariis, A. and Poinsot, T. },
title = {Influence of kinetics on DDT simulations},
year = {2019},
number = {february},
volume = {200},
pages = {1-14},
doi = {10.1016/j.combustflame.2018.11.009},
journal = {Combustion and Flame},
abstract = {Deflagration to Detonation Transition (DDT) is an intricate problem that has been tackled numerically, until recently, using single-step chemical schemes. These studies (summarized in Oran and Gamezo, 2007) [1] showed that DDT is triggered when a gradient of reactivity forms inside a pocket of unreacted material. However, recent numerical simulations of hydrogen/air explosions using detailed reaction mechanisms (Liberman et al., 2010; Ivanov et al., 2011) [2], [3] showed that detonation waves can emerge from the flame brush, unlike what was usually seen in the single-step simulations. The present work focuses on chemistry modeling and its impact on DDT. Using the idealized Hot Spot (HS) problem with constant temperature gradient, this study shows that, in the case of hydrogen/air mixtures, the multi-step chemical description is far more restrictive than the single-step model when it comes to the necessary conditions for a hot spot to lead to detonation. A gas explosion scenario in a confined and obstructed channel filled with an hydrogen/air mixture is then considered. In accordance with the HS analysis, the Zeldovich’s (1970) mechanism [4] is responsible for the detonation initiation in the single-step case, whereas another process, directly involving the deflagration front, initiated DDT in the complex chemistry case. In the latter, a shock focusing event leads to DDT in the flame brush through Pressure Pulse (PP) amplification.},
keywords = {DDT, Detailed chemistry, Flame acceleration, Detonation onset, DNS},
url = {https://doi.org/10.1016/j.combustflame.2018.11.009}}
Malé, Q., Staffelbach, G., Vermorel, O., Misdariis, A., Ravet, F. and Poinsot, T. (2019) Large Eddy Simulation of pre-chamber ignition in an internal combustion engine, Flow Turbulence and Combustion, 103 (2) , pp. 465–483, doi: 10.1007/s10494-019-00026-y
[bibtex]
@ARTICLE{AR-CFD-19-60,
author = {Malé, Q. and Staffelbach, G. and Vermorel, O. and Misdariis, A. and Ravet, F. and Poinsot, T. },
title = {Large Eddy Simulation of pre-chamber ignition in an internal combustion engine},
year = {2019},
number = {2},
volume = {103},
pages = {465–483},
doi = {10.1007/s10494-019-00026-y},
journal = {Flow Turbulence and Combustion},
abstract = {Using homogeneous lean mixtures is an efficient way to reduce fuel consumption and pollutant emissions in internal combustion engines. However, lean combustion requires breakthrough technologies to induce reliable ignition and fast combustion. One of these technologies uses pre-chamber to create multiple hot turbulent jets and provide ignition sites for the lean mixture. In this paper, the behaviour of a pre-chamber ignition system used to ignite the main chamber of a real engine is studied using large eddy simulation with direct integration of analytically reduced chemistry using the dynamic thickened flame model. The large eddy simulation allows to analyze the flow entering and leaving the pre-chamber, to measure the cooling and quenching effects introduced by the hot gas passages through the ducts connecting pre- and main chambers and to analyze the ignition and combustion sequences. For the case studied here, small amount of flame kernels are exhausted from the pre-chamb
er. Hot products penetrate the main chamber, disperse and mix with the fresh reactants and lead to ignition. The combustion in the main chamber starts in a distributed reaction mode before reaching a flamelet propagation mode.},
keywords = {Pre-chamber ignition, Turbulent jet ignition, Internal combustion engines, Large eddy simulation}}
Charoy, T., Boeuf, J.P., Carlsson, J., Chabert, P., Eremin, D., Garrigues, L., Hara, K., Kaganovich, I., Powis, T., Smolyakov, A., Sydorenko, D., Tavant, A., Vermorel, O. and Villafana, W. (2019) 2D axial-azimuthal Particle-In-Cell benchmark for low-temperature partially magnetized plasmas, Plasma Sources Science and Technology, 28 (10) , pp. paper 105010, doi: 10.1088/1361-6595/ab46c5
[bibtex]
[url]
@ARTICLE{AR-CFD-19-180,
author = {Charoy, T. and Boeuf, J.P. and Carlsson, J. and Chabert, P. and Eremin, D. and Garrigues, L. and Hara, K. and Kaganovich, I. and Powis, T. and Smolyakov, A. and Sydorenko, D. and Tavant, A. and Vermorel, O. and Villafana, W. },
title = {2D axial-azimuthal Particle-In-Cell benchmark for low-temperature partially magnetized plasmas},
year = {2019},
number = {10},
volume = {28},
pages = {paper 105010},
doi = {10.1088/1361-6595/ab46c5},
journal = {Plasma Sources Science and Technology},
abstract = {The increasing need to demonstrate the correctness of computer simulations has highlighted the importance of benchmarks. We define in this paper a representative simulation case to study low-temperature partially-magnetized plasmas. Seven independently developed particle-in-cell codes have simulated this benchmark case, with the same specified conditions. The characteristics of the codes used, such as implementation details or computing times and resources, are given. First, we compare at steady-state the time-averaged axial profiles of three main discharge parameters (axial electric field, ion density and electron temperature). We show that the results obtained exhibit a very good agreement within 5% between all the codes. As ${\boldsymbol{E}}\times {\boldsymbol{B}}$ discharges are known to cause instabilities propagating in the direction of electron drift, an analysis of these instabilities is then performed and a similar behaviour is retrieved between all the codes. A particular attention has been paid to the numerical convergence by varying the number of macroparticles per cell and we show that the chosen benchmark case displays a good convergence. Detailed outputs are given in the supplementary data, to be used by other similar codes in the perspective of code verification.},
keywords = {COMB},
url = {https://doi.org/10.1088/1361-6595/a}}
Rochette, B., Collin-Bastiani, F., Gicquel, L.Y.M., Vermorel, O., Veynante, D. and Poinsot, T. (2018) Influence of chemical schemes, numerical method and dynamic turbulent combustion modeling on LES of premixed turbulent flames., Combustion and Flame, 191 (May) , pp. 417-430
[bibtex]
[url]
@ARTICLE{AR-CFD-18-18,
author = {Rochette, B. and Collin-Bastiani, F. and Gicquel, L.Y.M. and Vermorel, O. and Veynante, D. and Poinsot, T. },
title = {Influence of chemical schemes, numerical method and dynamic turbulent combustion modeling on LES of premixed turbulent flames.},
year = {2018},
number = {May},
volume = {191},
pages = {417-430},
journal = {Combustion and Flame},
abstract = {This paper describes Large Eddy Simulations of a turbulent premixed flame
(the VOLVO rig) comparing Analytically Reduced Chemistry (ARC) with
globally reduced chemistry for propane-air combustion, a dynamic Thickened
Flame (TFLES) model with the usual non-dynamic TFLES model
and a high-order Taylor Galerkin numerical scheme with a low-order Lax-
Wendroff scheme. Comparisons with experimental data are presented for a
stable case in terms of velocity and temperature fields. They show that going
from two-step to ARC chemistry changes the flame stabilization zone. Compared
to the usual non-dynamic TFLES model, the dynamic formulation allows
to perform a parameter-free simulation. Finally, the order of accuracy of the
numerical method is also found to play an important role. As a result, the highorder
numerical method combined with the ARC chemistry and the dynamic
TFLES model provides the best comparison with the experimental data. Since
the VOLVO data base is used in various benchmarking exercices, this paper
suggests that these three elements (precise chemistry description, dynamic
parameter-free turbulent combustion model and high-order numerical methods)
play important roles and must be considered carefully in any LES approach.},
keywords = {COMB},
url = {https://doi.org/10.1016/j.combustflame.2018.01.016}}
de Laborderie, J., Duchaine, F., Gicquel, L.Y.M., Vermorel, O., Wang, G. and Moreau, S. (2018) Numerical analysis of a high-order unstructured overset grid method for compressible LES of turbomachinery, Journal of Computational Physics, 363 (June) , pp. 371–398, doi: 10.1016/j.jcp.2018.02.045
[bibtex]
[url]
@ARTICLE{AR-CFD-18-46,
author = {de Laborderie, J. and Duchaine, F. and Gicquel, L.Y.M. and Vermorel, O. and Wang, G. and Moreau, S. },
title = {Numerical analysis of a high-order unstructured overset grid method for compressible LES of turbomachinery},
year = {2018},
number = {June},
volume = {363},
pages = {371–398},
doi = {10.1016/j.jcp.2018.02.045},
journal = {Journal of Computational Physics},
abstract = {Large-Eddy Simulation (LES) is recognized as a promising method for high-fidelity flow predictions in turbomachinery applications. The presented approach consists of the coupling of several instances of the same LES unstructured solver through an overset grid method. A high-order interpolation, implemented within this coupling method, is introduced and evaluated on several test cases. It is shown to be third order accurate, to preserve the accuracy of various second and third order convective schemes and to ensure the continuity of diffusive fluxes and subgrid scale tensors even in detrimental interface configurations. In this analysis, three types of spurious waves generated at the interface are identified. They are significantly reduced by the high-order interpolation at the interface. The latter having the same cost as the original lower order method, the high-order overset grid method appears as a promising alternative to be used in all the applications.},
keywords = {comb},
url = {https://doi.org/10.1016/j.jcp.2018.02.045}}
Dounia, O., Vermorel, O. and Poinsot, T. (2018) Theoretical analysis and simulation of methane/air flame inhibition by sodium bicarbonate particles, Combustion and Flame, 193, pp. 397-416, doi: 10.1016/j.combustflame.2018.03.033
[bibtex]
@ARTICLE{AR-CFD-18-75,
author = {Dounia, O. and Vermorel, O. and Poinsot, T. },
title = {Theoretical analysis and simulation of methane/air flame inhibition by sodium bicarbonate particles},
year = {2018},
volume = {193},
pages = {397-416},
doi = {10.1016/j.combustflame.2018.03.033},
journal = {Combustion and Flame},
abstract = {The capacity of sodium bicarbonate (NaHCO3)s powder to chemically reduce flame speeds and mitigate the effects of accidental explosions is well established. The inhibition of premixed hydrocarbon/air flames by monodispersed (NaHCO3)s solid particles is investigated, here, using theory and numerical simulations. First, an analytical solution for the temperature history of a solid (NaHCO3)s particle crossing a flame shows that the size of the largest (NaHCO3)s particle which can decompose inside the flame front, and act on chemical reactions efficiently, strongly depends on the flame speed. For various fuels and a wide range of equivalence ratios, particles with a strong potential for flame inhibition are identified: hence a criterion, on the maximum particle size, for efficient inhibition is proposed. Thereafter, a one-dimensional methane/air flame traveling in a premixed gas loaded with sodium bicarbonate is simulated using a chemical mechanism based on GRI-Mech, extended to
include inhibition chemistry and reduced to 20 species with a DRGEP method. Inhibitor particle size and mass loading are varied to study the flame response to inhibition by (NaHCO3)s powders. Finally, two-dimensional simulations of a planar flame traveling in a flow with a non-uniform inhibitor mass loading distribution are analyzed. In the case of strong particle stratication, an acceleration of the flame is observed, instead of a mitigation. This fundamental mechanism may limit the actual potential of inhibition powders in real configurations.},
keywords = {DT, detonation, flame acceleration}}
Vermorel, O., Quillatre, P. and Poinsot, T. (2017) LES of explosions in venting chamber: a test case for premixed turbulent combustion models, Combustion and Flame, 183 (september) , pp. 207-223
[bibtex]
[url]
@ARTICLE{AR-CFD-17-91,
author = {Vermorel, O. and Quillatre, P. and Poinsot, T. },
title = {LES of explosions in venting chamber: a test case for premixed turbulent combustion models},
year = {2017},
number = {september},
volume = {183},
pages = {207-223},
journal = {Combustion and Flame},
abstract = {This paper presents a new experimental and Large Eddy Simulation (LES) database to study upscaling effects in vented gas explosions. The propagation of premixed flames in three setups of increasing size is investigated experimentally and numerically. The baseline model is the well-known laboratory-scale combustion chamber from Sydney (Kent et al. 2005, Masri et al. 2012); two exact replicas at scales 6 and 24.4 were set up by GexCon (Bergen, Norway). The volume ratio of the three setups varies from 1 to more than 10 000, a variation unseen in previous experiments, allowing the exploration of a large range of Reynolds and Damköhler numbers. LES of gaseous fully premixed flames have been performed on the three configurations, under different operating conditions, varying the number of obstacles in the chamber, their position and the type of fuel (hydrogen, propane and methane). Particular attention is paid to the influence of the turbulent combustion model on the results (overpressure, flame front speed) comparing two different algebraic sub-grid scale models, the closures of Colin et al. (2000) and Charlette et al. (2002), used in conjunction with a thickened flame approach. Mesh dependency is checked by performing a highly resolved LES on the small-scale case.
For a given scale and with a fixed model constant, LES results agree with experimental results, for all geometric arrangement of the obstacles and all fuels. However, when switching from small-scale cases to medium-scale or large-scale cases this conclusion does not hold, illustrating one of the main deficiencies of these algebraic models, namely the need for an a priori fitting of the model parameters.
Although this database was initially designed for safety studies, it is also a difficult test for turbulent combustion models.
},
keywords = {Gas explosion, Large Eddy Simulation, Turbulent combustion model, Efficiency function},
supplementaryMaterial = {https://cerfacs.fr/wp-content/uploads/2017/06/CFD_mmc1.mp4},
url = {https://hal.archives-ouvertes.fr/hal-01591941}}
Volpiani, PedroS., Schmitt, T., Vermorel, O., Quillatre, P. and Veynante, D. (2017) Large eddy simulation of explosion deflagrating flames using a dynamic wrinkling formulation, Combustion and Flame, 186 (december - Supplement C) , pp. 17-31, doi: 10.1016/j.combustflame.2017.07.022
[bibtex]
[url]
@ARTICLE{AR-CFD-17-254,
author = {Volpiani, PedroS. and Schmitt, T. and Vermorel, O. and Quillatre, P. and Veynante, D. },
title = {Large eddy simulation of explosion deflagrating flames using a dynamic wrinkling formulation},
year = {2017},
number = {december - Supplement C},
volume = {186},
pages = {17-31},
doi = {10.1016/j.combustflame.2017.07.022},
journal = {Combustion and Flame},
abstract = {Reliable predictions of flames propagating in a semi-confined environment are vital for safety reasons, once they are representative of accidental explosion configurations. Large eddy simulations of deflagrating flames are carried out using a dynamic flame wrinkling factor model. This model, validated from a posteriori analysis, is able to capture both laminar and turbulent flame regimes. At early stages of the flame development, a laminar flame propagates in a flow essentially at rest and the model parameter is close to zero, corresponding to a unity-wrinkling factor. Transition to turbulence occurs when the flame interacts with the flow motions generated by thermal expansion and obstacles. The model parameter and wrinkling factor take higher values at these stages. Three configurations investigated experimentally by Masri et al. 2012, corresponding to different scenarios of flame acceleration are simulated. The first case (OOBS) is characterized by a long laminar phase. In the second one (BBBS) the flame is the most turbulent and the highest overpressure is observed in the vessel. For the last case (BOOS), the flame front is relaminarized after crossing the first row of obstacles. In all configurations, large eddy simulations (LES) predict the flow dynamics and maximum overpressure with good accuracy.},
keywords = {Explosion ; Dynamic modeling ; Turbulent combustion ; Large eddy simulation ; Thickened flame model},
url = {http://www.sciencedirect.com/science/article/pii/S0010218017302675}}
Chaussonnet, G., Vermorel, O., Riber, E. and Cuenot, B. (2016) A new phenomenological model to predict drop size distribution in Large-Eddy Simulations of airblast atomizers, International Journal of Multiphase Flow, 80 (april 2016) , pp. 29-42, doi: 10.1016/j.ijmultiphaseflow.2015.10.014
[bibtex]
@ARTICLE{AR-CFD-16-26892,
author = {Chaussonnet, G. and Vermorel, O. and Riber, E. and Cuenot, B. },
title = {A new phenomenological model to predict drop size distribution in Large-Eddy Simulations of airblast atomizers},
year = {2016},
number = {april 2016},
volume = {80},
pages = {29-42},
doi = {10.1016/j.ijmultiphaseflow.2015.10.014},
journal = {International Journal of Multiphase Flow},
abstract = {A new atomization model for prefilming airblast atomizers is presented and applied in the Large-Eddy Simulation of an academic experiment. The model, named PAMELA, expresses the drop size Probability Density Function of the spray in the form of a Rosin–Rammler distribution whose parameters depend on flow conditions. A mechanism of liquid fragmentation is proposed where a Rayleigh–Taylor instability develops in the transverse direction. The wavelength of this instability (i) is assumed to be proportional to the Sauter Mean Diameter of the spray, and (ii) scales with a Weber number based on the atomizing edge thickness, providing a first link between flow conditions and the Rosin–Rammler parameters. The second link is found by introducing a second Weber number based on the thickness of the boundary layer developing on the prefilmer. A first comparison with academic experiments shows that the model assumptions are valid and allows to calibrate the model constants. PAMELA is then implemented in a LES solver to perform the numerical simulation of an academic airblast atomizer. The obtained drop size distribution and spatial structure of the spray are in good agreement with measurements, demonstrating the validity of the proposed approach in the context of LES, and that the proposed PAMELA model may now be used to describe the liquid spray in LES of industrial nozzles.}}
Misdariis, A., Vermorel, O. and Poinsot, T. (2015) A methodology based on reduced schemes to compute autoignition and propagation in internal combustion engines, Proceedings of the Combustion Institute, 35 (3) , pp. 3001-3008
[bibtex] [pdf]
@ARTICLE{AR-CFD-15-21269,
author = {Misdariis, A. and Vermorel, O. and Poinsot, T. },
title = {A methodology based on reduced schemes to compute autoignition and propagation in internal combustion engines},
year = {2015},
number = {3},
volume = {35},
pages = {3001-3008},
journal = {Proceedings of the Combustion Institute},
pdf = {https://cerfacs.fr/wp-content/uploads/2017/01/CFD_MISDARIIS_proci.pdf}}
Misdariis, A., Vermorel, O. and Poinsot, T. (2015) LES of knocking in engines using dual heat transfer and two-step reduced schemes, Combustion and Flame, 162 (11) , pp. 4304-4312, doi: 10.1016/j.combustflame.2015.07.023
[bibtex]
[url]
@ARTICLE{AR-CFD-15-27720,
author = {Misdariis, A. and Vermorel, O. and Poinsot, T. },
title = {LES of knocking in engines using dual heat transfer and two-step reduced schemes},
year = {2015},
number = {11},
volume = {162},
pages = {4304-4312},
doi = {10.1016/j.combustflame.2015.07.023},
journal = {Combustion and Flame},
abstract = {Large Eddy Simulation of knocking in piston engines requires high-fidelity physical models and numerical techniques. The need to capture temperature fields with high precision to predict autoignition is an additional critical constraint compared to existing LES in engines. The present work presents advances for LES of knocking in two fields: (1) a Conjugate Heat Transfer (CHT) technique is implemented to compute the flow within the engine over successive cycles with LES together with the temperature field within the cylinder head walls and the valves and (2) a reduced two-step scheme is used to predict both propagating premixed flames as well as autoignition times over a wide range of equivalence ratios, pressures and temperatures. The paper focuses on CHT which is critical for knocking because the gas temperature field is controlled by the wall temperature field and knocking is sensitive to small temperature changes. The CHT LES is compared to classical LES where the temperatures of the head and the valves are supposed to be homogeneous and imposed empirically. Results show that the skin temperature field (which is a result of the CHT LES while it is a user input for classical LES) is complex and controls knocking events. While the results of the CHT LES are obviously better because they suppress a large part of the empirical specification of the wall temperatures, this study also reveals a difficult and crucial element of the CHT approach: the description of exhaust valves cooling which are in contact with the engine head for part of the cycle and not in the rest of the cycle, leading to difficulties for heat transfer descriptions between valves and head. The CHT method is successfully applied to an engine studied at IFP Energies Nouvelles where knocking characteristics have been studied over a wide range of conditions.},
url = {http://www.sciencedirect.com/science/article/pii/S0010218015002242}}
Misdariis, A., Robert, A., Vermorel, O., Richard, S. and Poinsot, Th. (2014) Numerical methods and turbulence modeling for LES of piston engines: impact on flow motion and combustion, Oil and Gas Science and Technology-Revue IFP Energies nouvelles, 69 (1) , pp. 83 - 105
[bibtex]
@ARTICLE{AR-CFD-14-21268,
author = {Misdariis, A. and Robert, A. and Vermorel, O. and Richard, S. and Poinsot, Th. },
title = {Numerical methods and turbulence modeling for LES of piston engines: impact on flow motion and combustion},
year = {2014},
number = {1},
volume = {69},
pages = {83 - 105},
journal = {Oil and Gas Science and Technology-Revue IFP Energies nouvelles}}
Quillatre, P., Vermorel, O., Poinsot, Th. and Ricoux, P. (2013) Large Eddy Simulation of vented deflagration, Industrial and Engineering Chemistry Research, 52 (33) , pp. 11414 - 11423
[bibtex]
[url]
@ARTICLE{AR-CFD-13-21456,
author = {Quillatre, P. and Vermorel, O. and Poinsot, Th. and Ricoux, P. },
title = {Large Eddy Simulation of vented deflagration},
year = {2013},
number = {33},
volume = {52},
pages = {11414 - 11423},
journal = {Industrial and Engineering Chemistry Research},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_13_20.pdf}}
Granet, V., Vermorel, O., Lacour, C., Enaux, B., Dugué, V. and Poinsot, Th. (2012) Large Eddy Simulation and experimental study of cycle-to-cycle variations of stable and unstable operating points in a spark ignition engine, Combustion and Flame, 159 (4) , pp. 1562 - 1575
[bibtex]
@ARTICLE{AR-CFD-12-21008,
author = {Granet, V. and Vermorel, O. and Lacour, C. and Enaux, B. and Dugué, V. and Poinsot, Th. },
title = {Large Eddy Simulation and experimental study of cycle-to-cycle variations of stable and unstable operating points in a spark ignition engine},
year = {2012},
number = {4},
volume = {159},
pages = {1562 - 1575},
journal = {Combustion and Flame}}
Enaux, B., Granet, V., Vermorel, O., Lacour, C., Thobois, L., Dugué, V. and Poinsot, Th. (2011) Large Eddy Simulation of a motored single-cylinder piston engine: numerical strategies and validation, Flow Turbulence and Combustion, 86 (2) , pp. 153 - 177
[bibtex]
[url]
@ARTICLE{AR-CFD-11-20876,
author = {Enaux, B. and Granet, V. and Vermorel, O. and Lacour, C. and Thobois, L. and Dugué, V. and Poinsot, Th. },
title = {Large Eddy Simulation of a motored single-cylinder piston engine: numerical strategies and validation},
year = {2011},
number = {2},
volume = {86},
pages = {153 - 177},
journal = {Flow Turbulence and Combustion},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_10_31.pdf}}
Enaux, B., Granet, V., Vermorel, O., Lacour, C., Pera, C., Angelberger, C. and Poinsot, Th. (2011) LES study of cycle-to-cycle variations in a spark ignition engine, Proceedings of the Combustion Institute, 33 (2) , pp. 3115 - 3122
[bibtex]
@ARTICLE{AR-CFD-11-20877,
author = {Enaux, B. and Granet, V. and Vermorel, O. and Lacour, C. and Pera, C. and Angelberger, C. and Poinsot, Th. },
title = {LES study of cycle-to-cycle variations in a spark ignition engine},
year = {2011},
number = {2},
volume = {33},
pages = {3115 - 3122},
journal = {Proceedings of the Combustion Institute}}
Granet, V., Vermorel, O., Léonard, T., Gicquel, L.Y.M. and Poinsot, Th. (2010) Comparison of nonreflecting outlet boundary conditions for compressible solvers on unstructured grids, AIAA Journal, 48 (10) , pp. 2348 - 2364
[bibtex]
[url]
@ARTICLE{AR-CFD-10-21006,
author = {Granet, V. and Vermorel, O. and Léonard, T. and Gicquel, L.Y.M. and Poinsot, Th. },
title = {Comparison of nonreflecting outlet boundary conditions for compressible solvers on unstructured grids},
year = {2010},
number = {10},
volume = {48},
pages = {2348 - 2364},
journal = {AIAA Journal},
abstract = {This paper describes extensions and tests of characteristic methods for outlet boundary conditions in compressible solvers. Three methods based on the specification of ingoing waves using one- and multi-dimensional approximations are extended to unstructured grids. They are first compared for weak to strong vortices propagating on low to high speed mean flows through outlet sections. A major issue is to determine
the Mach number to be used in the specification of the transverse terms which must be taken into account in the ingoing wave amplitude specifications. For the vortex computations, results show that the averaged Mach number leads to better results than its local value. The boundary conditions are then tested in a more complex case: the flow around a turbine blade. A reference solution using a long distance between the blade trailing edge and the outlet plane is first computed: for this solution, outlet boundary conditions have almost no effect on the flow around the blade. The distance between the trailing edge and the outlet plane is then shortened and the various characteristic treatments are compared where intense vortices cross the outlet plane. Results confirm the conclusions obtained on the simple vortex test case.},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_10_2.pdf}}
Gourdain, N., Gicquel, L.Y.M., Montagnac, M., Vermorel, O., Gazaix, M., Staffelbach, G., Garcia, M., Boussuge, J.-F. and Poinsot, T. (2009) High performance parallel computing of flows in complex geometries - part 1: methods, Computational Science and Discovery, 2 (November) , pp. 015003
[bibtex]
[url]
@ARTICLE{AR-CFD-09-20992,
author = {Gourdain, N. and Gicquel, L.Y.M. and Montagnac, M. and Vermorel, O. and Gazaix, M. and Staffelbach, G. and Garcia, M. and Boussuge, J.-F. and Poinsot, T. },
title = {High performance parallel computing of flows in complex geometries - part 1: methods},
year = {2009},
number = {November},
volume = {2},
pages = {015003},
journal = {Computational Science and Discovery},
abstract = {Efficient numerical tools coupled with high-performance computers, have become a key element of the design process in the fields of energy supply and transportation.
However flow phenomena that occur in complex systems such as gas turbines and aircrafts are still not understood mainly because of the models that are needed. In fact, most computational
fluid dynamics (CFD) predictions as found today in industry focus on a reduced or simplified version of the real system (such as a periodic sector) and are usually solved with a steady-
state assumption. This paper shows how to overcome such barriers and how such a new challenge can be addressed by developing flow solvers running on high-end computing
platforms, using thousands of computing cores. Parallel strategies used by modern flow
solvers are discussed with particular emphases on mesh-partitioning, load balancing and
communication. Two examples are used to illustrate these concepts: a multi-block structured
code and an unstructured code. Parallel computing strategies used with both flow solvers are
detailed and compared. This comparison indicates that mesh-partitioning and load balancing
are more straightforward with unstructured grids than with multi-block structured meshes.
However, the mesh-partitioning stage can be challenging for unstructured grids, mainly due to
memory limitations of the newly developed massively parallel architectures. Finally, detailed
investigations show that the impact of mesh-partitioning on the numerical CFD solutions,
due to rounding errors and block splitting, may be of importance and should be accurately
addressed before qualifying massively parallel CFD tools for a routine industrial use},
url = {http://iopscience.iop.org/article/10.1088/1749-4699/2/1/015003/pdf}}
Gourdain, N., Gicquel, L.Y.M., Staffelbach, G., Vermorel, O., Duchaine, F., Boussuge, J.-F. and Poinsot, T. (2009) High performance parallel computing of flows in complex geometries - part 2: applications, Computational Science and Discovery, 2 (November) , pp. 015004
[bibtex]
[url]
@ARTICLE{AR-CFD-09-20993,
author = {Gourdain, N. and Gicquel, L.Y.M. and Staffelbach, G. and Vermorel, O. and Duchaine, F. and Boussuge, J.-F. and Poinsot, T. },
title = {High performance parallel computing of flows in complex geometries - part 2: applications},
year = {2009},
number = {November},
volume = {2},
pages = {015004},
journal = {Computational Science and Discovery},
abstract = {Present regulations in terms of pollutant emissions, noise and economical
constraints, require new approaches and designs in the fields of energy supply and
transportation. It is now well established that the next breakthrough will come from a
better understanding of unsteady flow effects and by considering the entire system and not
only isolated components. However, these aspects are still not well taken into account by
the numerical approaches or understood whatever the design stage considered. The main
challenge is essentially due to the computational requirements inferred by such complex
systems if it is to be simulated by use of supercomputers. This paper shows how new
challenges can be addressed by using parallel computing platforms for distinct elements of
a more complex systems as encountered in aeronautical applications. Based on numerical
simulations performed with modern aerodynamic and reactive flow solvers, this work
underlines the interest of high-performance computing for solving flow in complex industrial
configurations such as aircrafts, combustion chambers and turbomachines. Performance
indicators related to parallel computing efficiency are presented, showing that establishing
fair criterions is a difficult task for complex industrial applications. Examples of numerical
simulations performed in industrial systems are also described with a particular interest for
the computational time and the potential design improvements obtained with high-fidelity and
multi-physics computing methods. These simulations use either unsteady Reynolds-averaged
Navier–Stokes methods or large eddy simulation and deal with turbulent unsteady flows, such
as coupled flow phenomena (thermo-acoustic instabilities, buffet, etc). Some examples of the
difficulties with grid generation and data analysis are also presented when dealing with these
complex industrial applications.},
url = {http://iopscience.iop.org/article/10.1088/1749-4699/2/1/015004/pdf}}
Vermorel, O., Richard, S., Colin, O., Angelberger, C., Benkenida, A. and Veynante, D. (2009) Towards the understanding of cyclic variability in a spark ignited engine using multi-cycle les, Combustion and Flame, 156 (8) , pp. 1525 - 1541
[bibtex]
[url]
@ARTICLE{AR-CFD-09-21703,
author = {Vermorel, O. and Richard, S. and Colin, O. and Angelberger, C. and Benkenida, A. and Veynante, D. },
title = {Towards the understanding of cyclic variability in a spark ignited engine using multi-cycle les},
year = {2009},
number = {8},
volume = {156},
pages = {1525 - 1541},
journal = {Combustion and Flame},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_08_54.pdf}}
Senoner, J.-M., Garcia, M., Mendez, S., Staffelbach, G., Vermorel, O. and Poinsot, Th. (2008) The growth of rounding errors and the repetitivity of Large Eddy Simulation on parallel machines, AIAA Journal, 46 (7) , pp. 1773 - 1781
[bibtex]
[url]
@ARTICLE{AR-CFD-08-21598,
author = {Senoner, J.-M. and Garcia, M. and Mendez, S. and Staffelbach, G. and Vermorel, O. and Poinsot, Th. },
title = {The growth of rounding errors and the repetitivity of Large Eddy Simulation on parallel machines},
year = {2008},
number = {7},
volume = {46},
pages = {1773 - 1781},
journal = {AIAA Journal},
abstract = {This paper studies the growth rate of rounding errors in LES and shows that instantaneous flow fields produced by LES are partially controlled by these rounding errors and depend on multiple parameters: number of processors used for parallel simulation (even in an explicit code), changes in initial conditions (even of the order of machine accuracy), machine precision (simple, double or quadruple), etc. Using a fully developed turbulent channel flow and a laminar Poiseuille pipe flow as test cases, results show that only turbulent flows exhibit a high sensitivity to these parameters, leading to instantaneous flow fields which can be totally different after a few dozen flow-through times. Even though these results essentially confirm that LES reflects the true nature of turbulence, small perturbations of initial conditions growing rapidly in time, they highlight an often
overlooked challenge of LES in terms of validation and prediction of unsteady phenomena.},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_08_20.pdf}}
Dabireau, F., Cuenot, B., Vermorel, O. and Poinsot, Th. (2003) Interaction of H2/O2 flames with inert walls, Combustion and Flame, 135 (1-2) , pp. 123 - 133
[bibtex]
[url]
@ARTICLE{AR-CFD-03-20771,
author = {Dabireau, F. and Cuenot, B. and Vermorel, O. and Poinsot, Th. },
title = {Interaction of H2/O2 flames with inert walls},
year = {2003},
number = {1-2},
volume = {135},
pages = {123 - 133},
journal = {Combustion and Flame},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_02_94.pdf}}
Vermorel, O., Bédat, B., Simonin, O. and Poinsot, Th. (2003) Numerical study and modelling of turbulence modulation in a particle laden slab flow, Journal of Turbulence, 4 (025)
[bibtex]
[url]
@ARTICLE{AR-CFD-03-21700,
author = {Vermorel, O. and B´{e}dat, B. and Simonin, O. and Poinsot, Th. },
title = {Numerical study and modelling of turbulence modulation in a particle laden slab flow},
year = {2003},
number = {025},
volume = {4},
journal = {Journal of Turbulence},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_03_140.pdf}}
@CONFERENCE
Vanbersel, B., Meziat-Ramirez, F., Vermorel, O., Jaravel, T., Douasbin, Q. and Dounia, O. (2023) LES of Explosions and Adaptive Mesh Refinement, Journée de la combustion turbulente, Paris, 30 March. 2023
[bibtex]
@CONFERENCE{PR-CFD-23-42,
author = {Vanbersel, B. and Meziat-Ramirez, F. and Vermorel, O. and Jaravel, T. and Douasbin, Q. and Dounia, O. },
title = {LES of Explosions and Adaptive Mesh Refinement},
year = {2023},
booktitle = {Journée de la combustion turbulente, Paris, 30 March},
keywords = {presentation}}
Vanbersel, B., Meziat-Ramirez, F., Vermorel, O., Jaravel, T., Douasbin, Q. and Dounia, O. (2023) Large Eddy Simulations of a Hydrogen-Air Explosion in an Obstructed Chamber Using Adaptive Mesh Refinement, International Conference on Hydrogen Safety ICHS 2023, Quebec, September 19-21. 2023
[bibtex]
@CONFERENCE{PR-CFD-23-99,
author = {Vanbersel, B. and Meziat-Ramirez, F. and Vermorel, O. and Jaravel, T. and Douasbin, Q. and Dounia, O. },
title = {Large Eddy Simulations of a Hydrogen-Air Explosion in an Obstructed Chamber Using Adaptive Mesh Refinement},
year = {2023},
booktitle = {International Conference on Hydrogen Safety ICHS 2023, Quebec, September 19-21},
keywords = {Paper and Presentation}}
Vanbersel, B., Meziat-Ramirez, F., Dounia, O., Douasbin, Q., Jaravel, T. and Vermorel, O. (2023) Large Eddy Simulations of a hydrogen-air deflagration in an obstacle-laden channel using Adaptive Mesh Refinement, 11th European Combustion Meeting, Rouen, 26-28 April. 2023
[bibtex]
[url]
@CONFERENCE{PR-CFD-23-100,
author = {Vanbersel, B. and Meziat-Ramirez, F. and Dounia, O. and Douasbin, Q. and Jaravel, T. and Vermorel, O. },
title = {Large Eddy Simulations of a hydrogen-air deflagration in an obstacle-laden channel using Adaptive Mesh Refinement},
year = {2023},
booktitle = {11th European Combustion Meeting, Rouen, 26-28 April},
keywords = {paper and poster},
url = {https://ecm2023.sciencesconf.org/}}
Gicquel, L.Y.M., Sekularac, N., Daviller, G., Staffelbach, G., Dauptain, A., Vermorel, O. and Poinsot, T. (2023) Combustion noise and engine noise: current computational capabilities and fuel expected issues, Resonance conference, JISFA section, July 10-13 . 2023
[bibtex]
@CONFERENCE{PR-CFD-23-224,
author = {Gicquel, L.Y.M. and Sekularac, N. and Daviller, G. and Staffelbach, G. and Dauptain, A. and Vermorel, O. and Poinsot, T. },
title = {Combustion noise and engine noise: current computational capabilities and fuel expected issues},
year = {2023},
booktitle = {Resonance conference, JISFA section, July 10-13 }}
Villafana, W., Fubiani, G. and Garrigues, L. (2022) 3D Particle-In-Cell modeling of anomalous electron transport driven by the Electron Drift Instability in Hall thrusters, 37th International Electric Propulsion Conference, Massachusetts Institute of Technology, Cambridge, MA, USA June 19-23, 2022. 2022
[bibtex]
@CONFERENCE{PR-CFD-22-83,
author = {Villafana, W. and Fubiani, G. and Garrigues, L. },
title = {3D Particle-In-Cell modeling of anomalous electron transport driven by the Electron Drift Instability in Hall thrusters},
year = {2022},
booktitle = {37th International Electric Propulsion Conference, Massachusetts Institute of Technology, Cambridge, MA, USA June 19-23, 2022}}
Villafana, W., Fubiani, G., Garrigues, L., Vigot, G., Cuenot, B. and Vermorel, O. (2022) 3D Particle-In-Cell modeling of anomalous electron transport driven by the Electron Drift Instability in Hall thrusters, 37th International Electric Propulsion Conference Massachusetts Institute of Technology, Cambridge, MA, USA., 6 2022
[bibtex]
@CONFERENCE{PR-CFD-22-84,
author = {Villafana, W. and Fubiani, G. and Garrigues, L. and Vigot, G. and Cuenot, B. and Vermorel, O. },
title = {3D Particle-In-Cell modeling of anomalous electron transport driven by the Electron Drift Instability in Hall thrusters},
year = {2022},
month = {6},
booktitle = {37th International Electric Propulsion Conference Massachusetts Institute of Technology, Cambridge, MA, USA},
abstract = {Partially magnetized E×B discharges are highly coupled systems and subject to many plasma
instabilities. In particular, the important electron drift velocity with respect to unmagnetized
ions can lead to the growth and development of the Electron Drift Instability (EDI). The EDI
has been the focus of extensive experimental, theoretical and numerical studies over the last
two decades as it is suspected to play a role in the anomalous transport of electrons across
the magnetic barrier. Despite significant progress, numerical investigations, mostly based on
Particle-In-Cell modeling, have been mainly limited to 2D dimensional geometry due to the
prohibitive computational cost of fully kinetic simulations. In this paper, we present the last
developments of a 3D Particle-In-Cell study of a simplified Hall thruster allowing us to explore
further the 3D structure of the EDI.},
keywords = {Abstract}}
Lumet, E., Rochoux, M., Lacroix, S., Jaravel, T. and Vermorel, O. (2022) Sensitivity analysis of microscale pollutant dispersion large-eddy simulations towards observation network design, 21st International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Aveiro, 27-30 September, Portugal. 2022
[bibtex]
@CONFERENCE{PR-CMGC-22-135,
author = {Lumet, E. and Rochoux, M. and Lacroix, S. and Jaravel, T. and Vermorel, O. },
title = {Sensitivity analysis of microscale pollutant dispersion large-eddy simulations towards observation network design},
year = {2022},
booktitle = {21st International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Aveiro, 27-30 September, Portugal}}
Hok, J.-J., Vermorel, O., Jaravel, T. and Douasbin, Q. (2022) Effect of Flame Front Thermo-Diffusive Instability on Flame Acceleration in a Tube, 28th International Colloquium on the Dynamics of Explosions and Reactive Systems, Napoli, Italy., 6 2022
[bibtex]
@CONFERENCE{PR-CFD-22-138,
author = {Hok, J.-J. and Vermorel, O. and Jaravel, T. and Douasbin, Q. },
title = {Effect of Flame Front Thermo-Diffusive Instability on Flame Acceleration in a Tube},
year = {2022},
month = {6},
booktitle = {28th International Colloquium on the Dynamics of Explosions and Reactive Systems, Napoli, Italy},
keywords = {Oral presentation}}
Bogopolsky, G., Vermorel, O. and Cuenot, B. (2022) Dielectric boundary condition for an unstructured 2D radial-axial fluid simulation of a Hall thruster, Gaseous Electronics Conference, Sendei, Japan., 10 2022
[bibtex] [pdf]
@CONFERENCE{PR-CFD-22-153,
author = {Bogopolsky, G. and Vermorel, O. and Cuenot, B. },
title = {Dielectric boundary condition for an unstructured 2D radial-axial fluid simulation of a Hall thruster},
year = {2022},
month = {10},
booktitle = {Gaseous Electronics Conference, Sendei, Japan},
keywords = {Presentation},
pdf = {https://cerfacs.fr/wp-content/uploads/2022/10/CFD_Bogopolsky_AbstractGEC_2022_PR_CFD_22_153.pdf}}
Bogopolsky, G., Laurent, B., Vermorel, O. and Cuenot, B. (2022) Atelier propulsion électrique – CERFACS - invited conference, Atelier propulsion électrique, Paris, France., 12 2022
[bibtex]
@CONFERENCE{PR-CFD-22-187,
author = {Bogopolsky, G. and Laurent, B. and Vermorel, O. and Cuenot, B. },
title = {Atelier propulsion électrique – CERFACS - invited conference},
year = {2022},
month = {12},
booktitle = {Atelier propulsion électrique, Paris, France},
keywords = {presentation}}
Cuenot, B., Vermorel, O., Barleon, N. and Cheng, L. (2022) Plasma-assisted combustion: modeling and simulation - invited conference, RECENT DEVELOPMENTS IN COMBUSTION RESEARCH Webinars 11-14 of the Dutch Section of the Combustion Institute, TU Eindhoven., 12 2022
[bibtex]
@CONFERENCE{PR-CFD-22-188,
author = {Cuenot, B. and Vermorel, O. and Barleon, N. and Cheng, L. },
title = {Plasma-assisted combustion: modeling and simulation - invited conference},
year = {2022},
month = {12},
booktitle = {RECENT DEVELOPMENTS IN COMBUSTION RESEARCH Webinars 11-14 of the Dutch Section of the Combustion Institute, TU Eindhoven},
keywords = {lecture}}
Cellier, A., Duchaine, F., Vermorel, O., Poinsot, T., Leyko, M., Okyay, G. and Pallud, M. (2021) Large Eddy Simulation of Lithium-ion battery fires for the diagnostic of Thermal Runaway, MATHIAS days 2021, Serris, France, October 03-07. 2021
[bibtex]
@CONFERENCE{PR-CFD-21-257,
author = {Cellier, A. and Duchaine, F. and Vermorel, O. and Poinsot, T. and Leyko, M. and Okyay, G. and Pallud, M. },
title = {Large Eddy Simulation of Lithium-ion battery fires for the diagnostic of Thermal Runaway},
year = {2021},
booktitle = {MATHIAS days 2021, Serris, France, October 03-07},
keywords = {presentation}}
Villafana, W., Petronio, F., Jimenez, M., Tavant, A., Taccogna, F., Smolyakov, A., Denig, A., Hara, K., Bourdon, A., Chabert, P., Vermorel, O. and Cuenot, B. (2020) 2D radial-azimuthal Particle-In-Cell benchmark for ExB discharges, 73rd Annual Gaseous Electronics Virtual Conference., online conference 2020
[bibtex]
@CONFERENCE{PR-CFD-20-210,
author = {Villafana, W. and Petronio, F. and Jimenez, M. and Tavant, A. and Taccogna, F. and Smolyakov, A. and Denig, A. and Hara, K. and Bourdon, A. and Chabert, P. and Vermorel, O. and Cuenot, B. },
title = {2D radial-azimuthal Particle-In-Cell benchmark for ExB discharges},
year = {2020},
booktitle = {73rd Annual Gaseous Electronics Virtual Conference},
address = {online conference}}
Rochoux, M., Costes, A., Paugam, R., Rea, G., Thouron, L., Trucchia, A., Zhang, C., Jaravel, T., Lac, C., Masson, V., Trouvé, A., Vermorel, O. and Lucor, D. (2019) Emulating environmental modeling systems in presence of uncertainties: overview and challenges, Workshop on Frontiers of Uncertainty Quantification in Fluid Dynamics, Pisa,11-13 September, Italy. 2019
[bibtex]
@CONFERENCE{PR-CMGC-19-130,
author = {Rochoux, M. and Costes, A. and Paugam, R. and Rea, G. and Thouron, L. and Trucchia, A. and Zhang, C. and Jaravel, T. and Lac, C. and Masson, V. and Trouvé, A. and Vermorel, O. and Lucor, D. },
title = {Emulating environmental modeling systems in presence of uncertainties: overview and challenges},
year = {2019},
booktitle = {Workshop on Frontiers of Uncertainty Quantification in Fluid Dynamics, Pisa,11-13 September, Italy}}
Cuenot, B., Poinsot, T., Gicquel, L.Y.M., Vermorel, O., Duchaine, F., Riber, E., Dauptain, A., Staffelbach, G., Dombard, J., Misdariis, A. and Lapeyre, C. (2019) Large Eddy Simulation of turbulent reacting flows : methods and applications - Invited plenary lecture, 17th International Conference on Numerical Combustion. German section of the Combustion Institute, Aachen (Germany, 5 2019
[bibtex] [pdf]
@CONFERENCE{PR-CFD-19-164,
author = {Cuenot, B. and Poinsot, T. and Gicquel, L.Y.M. and Vermorel, O. and Duchaine, F. and Riber, E. and Dauptain, A. and Staffelbach, G. and Dombard, J. and Misdariis, A. and Lapeyre, C. },
title = {Large Eddy Simulation of turbulent reacting flows : methods and applications - Invited plenary lecture},
year = {2019},
month = {5},
booktitle = {17th International Conference on Numerical Combustion},
organization = { German section of the Combustion Institute},
address = {Aachen (Germany},
keywords = {combustion},
pdf = {https://cerfacs.fr/wp-content/uploads/2021/01/ICNC2019-Cuenot.pdf}}
Rochoux, M., Jaravel, T., Vermorel, O., Auguste, F., Nony, B., Rea, G. and Thouron, L. (2019) High-resolution simulation and uncertainty analysis for air pollutant dispersion at site scale, Journées Utilisateurs Meso-NH, OMP Toulouse, 7-8 October. 2019
[bibtex]
@CONFERENCE{PR-CMGC-19-172,
author = {Rochoux, M. and Jaravel, T. and Vermorel, O. and Auguste, F. and Nony, B. and Rea, G. and Thouron, L. },
title = {High-resolution simulation and uncertainty analysis for air pollutant dispersion at site scale},
year = {2019},
booktitle = {Journées Utilisateurs Meso-NH, OMP Toulouse, 7-8 October}}
Rochette, B., Vermorel, O., Gicquel, L.Y.M., Poinsot, T. and Veynante, D. (2018) ARC versus two-step chemistry and third-order versus second-order numeric scheme for Large Eddy Simulation of the Volvo burner, 2018 AIAA Aerospace Sciences Meeting . AIAA , Kissimmee, Florida 2018, doi: 10.2514/6.2018-0442
[bibtex]
@CONFERENCE{PR-CFD-18-44,
author = {Rochette, B. and Vermorel, O. and Gicquel, L.Y.M. and Poinsot, T. and Veynante, D. },
title = {ARC versus two-step chemistry and third-order versus second-order numeric scheme for Large Eddy Simulation of the Volvo burner},
year = {2018},
booktitle = {2018 AIAA Aerospace Sciences Meeting },
volume = {january 8-11, 2018},
pages = {AIAA 2018-0442},
organization = {AIAA },
address = {Kissimmee, Florida},
doi = {10.2514/6.2018-0442},
abstract = {Recent LES predictions of the Volvo configuration demonstrated the capacity of this
approach to recover the three reported operating modes of the burner: i.e. stable with
no main oscillatory motion of the flow, buzz and screetch with large thermo acoustic oscillations.
1 However, recent contributions2 have also demonstrated the sensitivity of this
specific application to multiple parameters: thermal boundary conditions, acoustic boundary
conditions as well as turbulent combustion modeling. In fact and as a result of such a
sensitivity, the stationary case is predicted with more or less success. As a consequence, no
specific modeling strategy or recommendation is evidenced and conclusions on the performance
of solvers or associated models remain rather difficult.3 In the following, the primary
objective is to systematically evidence the importance of chemistry modeling as well as numerics
and illustrate the impact of each component on the predictions of the stationary
test case of this MVP workshop. Four cases are hence specifically discussed relying either
on a specifically derived ARC chemistry scheme (22 species and 12 in a Quasi-Steady State
for 173 reactions) or the originally used reduced 2-step scheme (6 species and 2 reactions)
which are then to be used with a third-order or second-order accurate numerical scheme.
Out of these specific predictions, numerical scheme property is observed to be of primary
importance. As a result, the higher order scheme when used with ARC chemistry improves
the quality of the prediction compared to its use with the 2-step chemistry model. Reasons
for such behaviors are detailed and discussed providing potential routes for modeling and
mesh construction criteria when simulating the Volvo burner.},
keywords = {comb}}
Joncquières, V., Pechereau, F., Alvarez Laguna, A., Bourdon, A., Vermorel, O. and Cuenot, B. (2018) A 10-moment fluid numerical solver of plasma with sheaths in a Hall Effect Thruster, AIAA Joint Propulsion Conference. AIAA, Cincinatti, USA, 7 2018
[bibtex] [pdf]
@CONFERENCE{PR-CFD-18-71,
author = {Joncquières, V. and Pechereau, F. and Alvarez Laguna, A. and Bourdon, A. and Vermorel, O. and Cuenot, B. },
title = {A 10-moment fluid numerical solver of plasma with sheaths in a Hall Effect Thruster},
year = {2018},
month = {7},
booktitle = {AIAA Joint Propulsion Conference},
organization = {AIAA},
address = {Cincinatti, USA},
abstract = {Electric propulsion can reach higher exhaust velocities compared to chemical systems and
thus result in lower propellant mass requirements. Among the different electric propulsion
systems, Hall effect thrusters are used for spatial propulsion since the 1970s. However inside
a Hall thruster, complex physical phenomena such as erosion or electron anomalous transport
which may lower thruster efficiency and lifetime, are not yet fully understood. Thanks
to high performance computing, numerical simulations are now considered for understanding
the plasma behavior. With the renewed interest for such electric propulsion to supply small
satellites, numerical solvers able to predict accurately the real thruster efficiency have become
crucial for industry.
This paper presents the approach used and first validation tests of such a solver. The AVIP
code solves plasma equations in complex industrial geometries using an unstructured parallelefficient
3D fluid methodology. AVIP also includes a Particle-In-Cell (PIC) solver used as a
reference for validation. While full 3D PIC simulations of a Hall thruster still require unaffordable
computational time, fluid models provide in a reasonable time 3D results on the plasma
behavior inside the discharge channel. In this category, standard drift-diffusion models [1–3]
are fast and robust but at the cost of strong hypotheses and simplifications. In particular such
models do not describe explicitly the sheath formation in the vicinity of walls and often use analytical
models instead. They are limited to simple configurations and only provide a first insight
into plasma complex phenomena. The present approach includes a more detailed two-fluid
plasma model without drift-diffusion approximation. After the description of the formulation
and main features of the solver, the paper focuses on wall boundary conditions which are
crucial for the formation of sheaths. It is demonstrated in particular that a vacuum boundary
condition is not adapted to fit PIC results. A boundary condition based on wall thermal fluxes
is more realistic. The mesh resolution is also found to be critical. The simulation methodology
is finally applied to a 2D simulation of a typical Hall effect thruster in order to observe the
plasma properties inside the discharge chamber.},
keywords = {propulsion, plasma, fluid},
pdf = {https://cerfacs.fr/wp-content/uploads/2018/06/CFD_JONCQUIERES_AIAA_JPC_2018.pdf}}
Brunet, V., Croner, E., Minot, A., de Laborderie, J., Lippinois, E., Richard, S., Boussuge, J.-F., Dombard, J., Duchaine, F., Gicquel, L.Y.M., Poinsot, T., Puigt, G., Staffelbach, G., Segui-Troth, L., Vermorel, O., Villedieu, N., Cagnone, J.-S., Hillewaert, K., Rasquin, M., Lartigue, G., Moureau, V., Couaillier, V., Martin, E., de la Llave Plata, M., Le Gouez, J.-M. and Renac, F. (2018) Comparison of Various CFD Codes for LES Simulations of Turbomachinery: From Inviscid Vortex Convection to Multi-Stage Compressor, ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition., Oslo (Norway), 6 2018, doi: 10.1115/GT2018-75523
[bibtex]
[url]
@CONFERENCE{PR-CFD-18-225,
author = {Brunet, V. and Croner, E. and Minot, A. and de Laborderie, J. and Lippinois, E. and Richard, S. and Boussuge, J.-F. and Dombard, J. and Duchaine, F. and Gicquel, L.Y.M. and Poinsot, T. and Puigt, G. and Staffelbach, G. and Segui-Troth, L. and Vermorel, O. and Villedieu, N. and Cagnone, J.-S. and Hillewaert, K. and Rasquin, M. and Lartigue, G. and Moureau, V. and Couaillier, V. and Martin, E. and de la Llave Plata, M. and Le Gouez, J.-M. and Renac, F. },
title = {Comparison of Various CFD Codes for LES Simulations of Turbomachinery: From Inviscid Vortex Convection to Multi-Stage Compressor},
year = {2018},
month = {6},
booktitle = {ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition},
volume = {2C},
number = {GT2018-75523},
pages = {V02CT42A013},
address = {Oslo (Norway)},
doi = {10.1115/GT2018-75523},
abstract = {Some possible future High Fidelity CFD codes for LES simulation of turbomachinery are compared on several test cases increasing in complexity, starting from a very simple inviscid Vortex Convection to a multistage axial experimental compressor. Simulations were performed between 2013 and 2016 by major Safran partners (Cenaero, Cerfacs, CORIA and Onera) and various numerical methods compared: Finite Volume, Discontinuous Galerkin, Spectral Differences. Comparison to analytical results, to experimental data or to RANS simulations are performed to check and measure accuracy. CPU efficiency versus accuracy are also presented. It clearly appears that the level of maturity could be different between codes and numerical approaches. In the end, advantages and disadvantages of every codes obtained during this project are presented.},
keywords = { Compressors , Simulation , Computational fluid dynamics , Convection , Vortices , Turbomachinery},
url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2700709}}
Collin-Bastiani, F., Vermorel, O., Lacour, C., Richard, S., Cayre, A. and Cuenot, B. (2017) DNS of plasma to combustion transition in spark ignition using analytically reduced chemistry, 4e Colloque du réseau d’INitiative en Combustion Avancée (INCA). SAFRAN TECH, Palaiseau, France 2017
[bibtex]
@CONFERENCE{PR-CFD-17-265,
author = {Collin-Bastiani, F. and Vermorel, O. and Lacour, C. and Richard, S. and Cayre, A. and Cuenot, B. },
title = {DNS of plasma to combustion transition in spark ignition using analytically reduced chemistry},
year = {2017},
booktitle = {4e Colloque du réseau d’INitiative en Combustion Avancée (INCA)},
organization = {SAFRAN TECH},
address = {Palaiseau, France},
abstract = {In order to guarantee good re-ignition capacities in case of engine failure during flight, it is of
prime interest for engine manufacturers to understand the physics of ignition from the spark discharge
to the full burner lightning. During the ignition process, a spark plug delivers a very short and powerful
electrical discharge to the mixture. A plasma is first created before combustion reactions initiate, resulting
in a small flame kernel [1]. The present work focuses on this still misunderstood first instants of ignition, i.e.
from the sparking to the flame kernel formation. 3D Direct Numerical Simulations of propane-air ignition
sequences induced by an electric discharge are performed with the AVBP solver on a simple anode-cathode
set-up. An Analytically Reduced Chemistry (ARC) including 38 species and 366 irreversible reactions has
been developed and used to describe the coupled combustion and plasma kinetics. The e ect of plasma
chemistry on the temperature field is found to be non-negligible up to a few microseconds after the spark
due to endothermic dissociation and ionization reactions. However its impact on the subsequent flame kernel
development appears to be weak in the studied configuration},
keywords = {COMB, AVBP}}
Rochoux, M., Rea, G., De Lozzo, M. and Vermorel, O. (2017) Quantifying uncertainties in large eddy simulations of pollutant dispersion using surrogate models, Workshop Traitement des Données Massives en Mécanique des Fluides, Université Paris-Saclay, 29 November-1 December.. 2017
[bibtex]
@CONFERENCE{PR-CMGC-17-308,
author = {Rochoux, M. and Rea, G. and De Lozzo, M. and Vermorel, O. },
title = {Quantifying uncertainties in large eddy simulations of pollutant dispersion using surrogate models},
year = {2017},
booktitle = {Workshop Traitement des Données Massives en Mécanique des Fluides, Université Paris-Saclay, 29 November-1 December.}}
de Laborderie, J., Duchaine, F., Vermorel, O., Gicquel, L.Y.M. and Moreau, S. (2016) Application of an overset grid method to the Large-Eddy Simulation of a high speed multistage axial compressor, ASME Turbo Expo 2016., Seoul, South Korea 2016
[bibtex]
@CONFERENCE{PR-CFD-16-29529,
author = {de Laborderie, J. and Duchaine, F. and Vermorel, O. and Gicquel, L.Y.M. and Moreau, S. },
title = {Application of an overset grid method to the Large-Eddy Simulation of a high speed multistage axial compressor},
year = {2016},
pages = {GT2016-56344},
address = {Seoul, South Korea},
booktitle = {ASME Turbo Expo 2016}}
Rochette, B., Collin, A., Maestro, D., Vermorel, O., Gicquel, L.Y.M. and Poinsot, T. (2016) Influence of acoustic, chemistry description and wall heat transfer in LES of the Volvo bluff-body stabilized flame dynamics, AIAA Sciences and Technology Forum and Exposition 2017. AIAA 2016
[bibtex]
@CONFERENCE{PR-CFD-16-306,
author = {Rochette, B. and Collin, A. and Maestro, D. and Vermorel, O. and Gicquel, L.Y.M. and Poinsot, T. },
title = {Influence of acoustic, chemistry description and wall heat transfer in LES of the Volvo bluff-body stabilized flame dynamics},
year = {2016},
booktitle = {AIAA Sciences and Technology Forum and Exposition 2017},
organization = {AIAA},
abstract = {Recent compressible turbulent reacting LES predictions of the Volvo configuration
demonstrated the capacity of this approach to recover the three reported operating modes
of the burner: i.e. stable with no main oscillatory motion of the mean flow, buzz and
screech with large thermo acoustic oscillations. Despite this success in recovering experimental
observations, this advanced numerical approach is known to suffer from intrinsic
limitations and difficulties which can explain the wide range of reported conclusions for
the Volvo configuration. To better apprehend this working context, specific issues related
to LES are detailed and gauged for this burner. Indeed, while numerics is clearly a key
element of LES, boundary conditions are often approximative despite their importance,
especially in the context of thermo acoustic instabilities. Connected to this inflow/outflow
modeling, the actual computational domain extent should be chosen in agreement with the
inflow/outflow boundary conditions while the cross stream dimensions need to cover the
real geometry if associated acoustic eigen mode directions are to be properly captured by
the simulations. In the same line, the thermal conditions of bluff-body are known to potentially
infer different flame anchoring conditions more or less favorable to the triggering of
oscillatory or non-oscillatory operating flows. Impacts and quantifications of such modeling
difficulties are detailed in this work on the basis of the stable operating condition of the
Volvo configuration.},
keywords = {Thermo acoustic instabilities, LES, AVBP, combustion},
supplementaryMaterial = {https://cerfacs.fr/wp-content/uploads/2016/12/AIAASciTech_VolvoCERFACS.pdf}}
Chaussonnet, G., Riber, E., Vermorel, O., Cuenot, B., Gepperth, S. and Koch, R. (2013) Large eddy simulation of a prefilming airblast atomizer, 25th european conference on liquid atomization and spray systems., Chania, Greece 2013
[bibtex]
[url]
@conference{PR-CFD-13-23197,
author = {Chaussonnet, G. and Riber, E. and Vermorel, O. and Cuenot, B. and Gepperth, S. and Koch, R. },
title = {Large eddy simulation of a prefilming airblast atomizer},
year = {2013},
address = {Chania, Greece},
booktitle = {25th european conference on liquid atomization and spray systems},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_13_59.pdf}}
Cuenot, B., Gicquel, L.Y.M., Riber, E., Staffelbach, G., Vermorel, O., Dauptain, A., Duchaine, F. and Poinsot, Th. (2013) Simulations aux Grandes Echelles: instabilités thermo-acoustiques, combustion diphasique et couplages multi-physiques - invited conference, 21 ième congrès français de mécanique - bordeaux, france. 2013
[bibtex]
[url]
@conference{PR-CFD-13-23224,
author = {Cuenot, B. and Gicquel, L.Y.M. and Riber, E. and Staffelbach, G. and Vermorel, O. and Dauptain, A. and Duchaine, F. and Poinsot, Th. },
title = {Simulations aux Grandes Echelles: instabilit´{e}s thermo-acoustiques, combustion diphasique et couplages multi-physiques - invited conference},
year = {2013},
booktitle = {21 i`{e}me congr`{e}s franc{c}ais de m´{e}canique - bordeaux, france},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_13_68.pdf}}
Gicquel, L.Y.M., Moreau, S., Staffelbach, G., Vermorel, O., Dauptain, A., Gourdain, N., Collado, E., Giret, J.-C. and Poinsot, Th. (2013) Compressible LES for airframe noise - invited conference, Lecture series: accurate and efficient aeroacoustic prediction approaches for airframe noise., Von Karman Institute for Fluid Dynamics Rhodes St Genese (Belgique) 2013
[bibtex]
[url]
@conference{PR-CFD-13-23327,
author = {Gicquel, L.Y.M. and Moreau, S. and Staffelbach, G. and Vermorel, O. and Dauptain, A. and Gourdain, N. and Collado, E. and Giret, J.-C. and Poinsot, Th. },
title = {Compressible LES for airframe noise - invited conference},
year = {2013},
address = {Von Karman Institute for Fluid Dynamics Rhodes St Genese (Belgique)},
booktitle = {Lecture series: accurate and efficient aeroacoustic prediction approaches for airframe noise},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_13_31.pdf}}
Gicquel, L.Y.M., Cuenot, B., Staffelbach, G., Vermorel, O., Riber, E., Dauptain, A. and Poinsot, T. (2013) Simulation en combustion diphasique turbulente: codes, formation, diffusion chez les industriels, calculs HPC - GENCI, PRACE, INCITE - invited conference, JOURNÉE CFD EQUIP@MESO 2013. CORIA, UNIVERSITE DE ROUEN, 5 2013
[bibtex]
[url]
@CONFERENCE{PR-CFD-13-4,
author = {Gicquel, L.Y.M. and Cuenot, B. and Staffelbach, G. and Vermorel, O. and Riber, E. and Dauptain, A. and Poinsot, T. },
title = {Simulation en combustion diphasique turbulente: codes, formation, diffusion chez les industriels, calculs HPC - GENCI, PRACE, INCITE - invited conference},
year = {2013},
month = {5},
booktitle = {JOURNÉE CFD EQUIP@MESO 2013},
organization = {CORIA},
address = { UNIVERSITE DE ROUEN},
abstract = {Dans le cadre des actions d'animation scientifique de l'équipement d'excellence Equip@meso, un colloque intitulé "Mécanique des fluides numérique intensive : méthodes et nouvelles applications" est organisé, le 16 mai 2013, au CRIHAN (salle de conférence du CORIA ou amphithéâtre de l'Université de Rouen en fonction du nombre d'inscrits). Méthodes de calcul haute performance et nouveaux enjeux scientifiques seront présentés par des chercheurs en mécanique des fluides, utilisateurs des mésocentres Equip@meso},
url = {http://equipameso-cfd2013.crihan.fr/doku.php?id=resumecerfacs}}
Gicquel, L.Y.M., Cuenot, B., Staffelbach, G., Vermorel, O., Riber, E., Dauptain, A., Duchaine, F., Gourdain, N., Sicot, F. and Poinsot, Th. (2012) CERFACS state-of-the-art and recent investigations for temperature predictions in turbo-machineries - invited conference, Conference on high fidelity simulations of combustion turbine systems., GE RC Niskayuna, NY, USA 2012
[bibtex]
[url]
@conference{PR-CFD-12-23326,
author = {Gicquel, L.Y.M. and Cuenot, B. and Staffelbach, G. and Vermorel, O. and Riber, E. and Dauptain, A. and Duchaine, F. and Gourdain, N. and Sicot, F. and Poinsot, Th. },
title = {CERFACS state-of-the-art and recent investigations for temperature predictions in turbo-machineries - invited conference},
year = {2012},
address = {GE RC Niskayuna, NY, USA},
booktitle = {Conference on high fidelity simulations of combustion turbine systems},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_12_44.pdf}}
Misdariis, A., Robert, A., Vermorel, O., Richard, S. and Poinsot, Th. (2012) Numerical methods and turbulence modeling for LES of piston engines: impact on flow motion and combustion, International conference on les for internal combustion engine flows., IFP Energies nouvelles, Rueil-Malmaison, France 2012
[bibtex]
[url]
@conference{PR-CFD-12-23418,
author = {Misdariis, A. and Robert, A. and Vermorel, O. and Richard, S. and Poinsot, Th. },
title = {Numerical methods and turbulence modeling for LES of piston engines: impact on flow motion and combustion},
year = {2012},
address = {IFP Energies nouvelles, Rueil-Malmaison, France},
booktitle = {International conference on les for internal combustion engine flows},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_12_78.pdf}}
Gicquel, L.Y.M., Cuenot, B., Staffelbach, G., Vermorel, O., Riber, E., Dauptain, A. and Poinsot, Th. (2011) Panel session 4-34 - LES modeling of combustors: CERFACS perspective - invited conference, Asme turbo-expo., Vancouver, Canada 2011
[bibtex]
[url]
@conference{PR-CFD-11-23323,
author = {Gicquel, L.Y.M. and Cuenot, B. and Staffelbach, G. and Vermorel, O. and Riber, E. and Dauptain, A. and Poinsot, Th. },
title = {Panel session 4-34 - LES modeling of combustors: CERFACS perspective - invited conference},
year = {2011},
address = {Vancouver, Canada},
booktitle = {Asme turbo-expo},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_11_52.pdf}}
Gicquel, L.Y.M., Cuenot, B., Staffelbach, G., Vermorel, O., Riber, E., Dauptain, A., Duchaine, F. and Poinsot, Th. (2011) LES modeling and sensitivity issues - implications on the prediction and flame dynamics - invited conference, Ge global research symposium on LES of turbulent reacting flows for GT design., Niskayuna, NY, USA 2011
[bibtex]
@conference{PR-CFD-11-23325,
author = {Gicquel, L.Y.M. and Cuenot, B. and Staffelbach, G. and Vermorel, O. and Riber, E. and Dauptain, A. and Duchaine, F. and Poinsot, Th. },
title = {LES modeling and sensitivity issues - implications on the prediction and flame dynamics - invited conference},
year = {2011},
address = {Niskayuna, NY, USA},
booktitle = {Ge global research symposium on LES of turbulent reacting flows for GT design}}
Quillatre, P., Vermorel, O. and Poinsot, Th. (2011) Large Eddy Simulation of turbulent premixed flames propagation in a small scale venting chamber: influence of chemistry and transport modelling, Seventh mediterranean combustion symposium., Sardaigne, Italy 2011
[bibtex]
[url]
@conference{PR-CFD-11-23497,
author = {Quillatre, P. and Vermorel, O. and Poinsot, Th. },
title = {Large Eddy Simulation of turbulent premixed flames propagation in a small scale venting chamber: influence of chemistry and transport modelling},
year = {2011},
address = {Sardaigne, Italy},
booktitle = {Seventh mediterranean combustion symposium},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_11_43.pdf}}
Granet, V., Vermorel, O., Lacour, C., Enaux, B., Dugué, V. and Poinsot, Th. (2010) Using large Eddy Simulation to quantify cycle-to-cycle variability in a spark-ignition engines, Les for internal combustion engine flows., IFP, Rueil-Malmaison, France 2010
[bibtex]
[url]
@conference{PR-CFD-10-23347,
author = {Granet, V. and Vermorel, O. and Lacour, C. and Enaux, B. and Dugu´{e}, V. and Poinsot, Th. },
title = {Using large Eddy Simulation to quantify cycle-to-cycle variability in a spark-ignition engines},
year = {2010},
address = {IFP, Rueil-Malmaison, France},
booktitle = {Les for internal combustion engine flows},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_10_146.pdf}}
Dufour, G., Gourdain, N., Duchaine, F., Vermorel, O., Gicquel, L.Y.M. and Boussuge, J.-F. (2009) Large Eddy Simulation applications - invited conference, Vki lecture series on : numerical investigations in turbomachinery: the state-of-the-art., Van Karman Institute, Brussels, Belgium 2009
[bibtex]
[url]
@conference{PR-CFD-09-23274,
author = {Dufour, G. and Gourdain, N. and Duchaine, F. and Vermorel, O. and Gicquel, L.Y.M. and Boussuge, J.-F. },
title = {Large Eddy Simulation applications - invited conference},
year = {2009},
address = {Van Karman Institute, Brussels, Belgium},
booktitle = {Vki lecture series on : numerical investigations in turbomachinery: the state-of-the-art},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_09_156.pdf}}
Gourdain, N., Gicquel, L.Y.M., Montagnac, M., Vermorel, O., Gazaix, M., Staffelbach, G., Garcia, M., Boussuge, J.-F. and Poinsot, Th. (2009) High performance computing of industrial flows: application to aeronautic and propulsion challenges - invited conference, VKI lecture series on high performance computing of industrial flows., Von Karman Institute, Brussels, Belgium 2009
[bibtex]
@CONFERENCE{PR-CFD-09-23340,
author = {Gourdain, N. and Gicquel, L.Y.M. and Montagnac, M. and Vermorel, O. and Gazaix, M. and Staffelbach, G. and Garcia, M. and Boussuge, J.-F. and Poinsot, Th. },
title = {High performance computing of industrial flows: application to aeronautic and propulsion challenges - invited conference},
year = {2009},
address = {Von Karman Institute, Brussels, Belgium},
booktitle = {VKI lecture series on high performance computing of industrial flows}}
Staffelbach, G., Wolf, P., Enaux, B. and Vermorel, O. (2008) Simulation aux grandes echelles dans les moteurs - invited conference, Cines., Montpellier, France 2008
[bibtex]
@conference{PR-CFD-08-21641,
author = {Staffelbach, G. and Wolf, P. and Enaux, B. and Vermorel, O. },
title = {Simulation aux grandes echelles dans les moteurs - invited conference},
year = {2008},
address = {Montpellier, France},
booktitle = {Cines}}
Dabireau, F., Vermorel, O., Cuenot, B. and Poinsot, Th. (2002) Flame wall interaction of an H2/O2 flame, 12th international heat transfer conference., Grenoble, France 2002
[bibtex]
[url]
@conference{PR-CFD-02-23232,
author = {Dabireau, F. and Vermorel, O. and Cuenot, B. and Poinsot, Th. },
title = {Flame wall interaction of an H2/O2 flame},
year = {2002},
address = {Grenoble, France},
booktitle = {12th international heat transfer conference},
url = {https://cerfacs.fr/~cfdbib/repository/TR_CFD_02_26.pdf}}
