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Mécanique des fluides numérique
05 61 19 30 33
olivier.vermorel@cerfacs.fr

Publications

@ARTICLE

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, pp. 1-14
[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}, 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}}

Joncquières, V., Vermorel, O. and Cuenot, B. (2019) A fluid formalism for low-temperature plasma flows dedicated to space propulsion in an unstructured High Performance Computing solver, Plasma Sources Science and Technology
[bibtex]

@ARTICLE{AR-CFD-19-136, 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 = {2019}, 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}}

Rochette, B., Riber, E., Vermorel, O. and Cuenot, B. (2019) A generic and self-adapting method for flame detection and thickening in the Thickened Flame model, Combustion and Flame
[bibtex]

@ARTICLE{AR-CFD-19-168, 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 = {2019}, 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}}

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, pp. 417-430
[bibtex] [url] [pdf]

@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}, pdf = {https://cerfacs.fr/wp-content/uploads/2017/11/CFD_rochette_cnf_2017.pdf}, 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, 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] [pdf]

@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}, pdf = {https://cerfacs.fr/wp-content/uploads/2018/06/CFD_DOUNIA_COMBandFJUIN2018.pdf}}

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, pp. 207-223
[bibtex] [pdf]

@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}, pdf = {https://cerfacs.fr/wp-content/uploads/2017/06/CFD_vermorel_CF_2017.pdf}, supplementaryMaterial = {https://cerfacs.fr/wp-content/uploads/2017/06/CFD_mmc1.mp4}}

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, 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, 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 = {http://www.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 = {http://www.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 = {http://www.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, 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, 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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.cerfacs.fr/~cfdbib/repository/TR_CFD_03_140.pdf}}

@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}}

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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.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 = {http://www.cerfacs.fr/~cfdbib/repository/TR_CFD_02_26.pdf}}

@BOOK

Gicquel, L.Y.M., Vermorel, O., Duchaine, F., Riber, E., Dauptain, A., Staffelbach, G., Cuenot, B. and Poinsot, T. (2013) Best Practice Guidelines in Computational Fluid Dynamics of Turbulent combustion, ERCOFTAC
[bibtex]

@BOOK{BK-CFD-13-3, author = {Gicquel, L.Y.M. and Vermorel, O. and Duchaine, F. and Riber, E. and Dauptain, A. and Staffelbach, G. and Cuenot, B. and Poinsot, T. }, title = {Best Practice Guidelines in Computational Fluid Dynamics of Turbulent combustion}, year = {2013}, month = {2}, chaptertitle = {Gas Turbine and Industrial Burners}, publisher = {ERCOFTAC}, chapter = {4}}

@TECHREPORT

Gicquel, L.Y.M. and Vermorel, O. (2011) CFD e-Learning: Discretization, stability, dispersion and dissipation, Cerfacs, Tutorial
[bibtex]

@TECHREPORT{TU-CFD-11-20966, author = {Gicquel, L.Y.M. and Vermorel, O. }, title = {CFD e-Learning: Discretization, stability, dispersion and dissipation}, year = {2011}, institution = {Cerfacs}, type = {Tutorial}}

Vermorel, O., Richard, S., Colin, O., Angelberger, C., Benkenida, A. and Veynante, D. (2008) Understanding cyclic variability in a spark ignited engine using multi-cycle LES, Cerfacs
[bibtex]

@techreport{TR-CFD-08-21702, author = {Vermorel, O. and Richard, S. and Colin, O. and Angelberger, C. and Benkenida, A. and Veynante, D. }, title = {Understanding cyclic variability in a spark ignited engine using multi-cycle LES}, year = {2008}, institution = {Cerfacs}}

Vermorel, O. (2007) Méthode de prédécoupage de maillage mobile en ligne, Cerfacs, projet anr campas, livrable l4
[bibtex]

@techreport{TR-CFD-07-21701, author = {Vermorel, O. }, title = {M´{e}thode de pr´{e}d´{e}coupage de maillage mobile en ligne}, year = {2007}, institution = {Cerfacs}, month = {11}, type = {projet anr campas, livrable l4}}

Dabireau, F. and Vermorel, O. (1999) Prédiction des flux thermiques pariétaux à l'aide de codes Navier-Stokes, Cerfacs, technical report snecma
[bibtex]

@techreport{TR-CFD-99-20765, author = {Dabireau, F. and Vermorel, O. }, title = {Pr´{e}diction des flux thermiques pari´{e}taux `{a} l´aide de codes Navier-Stokes}, year = {1999}, institution = {Cerfacs}, month = {11}, type = {technical report snecma}}

Vermorel, O. (1999) Flame wall interaction of H2-O2 flames, Cerfacs, studend report
[bibtex]

@techreport{TR-CFD-99-21698, author = {Vermorel, O. }, title = {Flame wall interaction of H2-O2 flames}, year = {1999}, institution = {Cerfacs}, type = {studend report}}

Vermorel, O. (1999) Etude de l'interaction flamme-paroi: application au moteur fusée, Institut National Polytechnique de Toulouse - ENSEEIHT, rapport de fin d'étude
[bibtex]

@techreport{TR-CFD-99-21699, author = {Vermorel, O. }, title = {Etude de l´interaction flamme-paroi: application au moteur fus´{e}e}, year = {1999}, institution = {Institut {N}ational {P}olytechnique de {T}oulouse - ENSEEIHT}, month = {6}, type = {rapport de fin d´´{e}tude}}

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