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Centre of basic and applied research specialized in modelling and numerical simulation, Cerfacs, through its facilities and expertise in high-performance computing, deals with major scientific and technical research problems of public and industrial interest.

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A bronze medal to Cerfacs for “Allons-Y À Vélo” !

CERFACS |  26 July 2021

A bronze medal to Cerfacs for "Allons-Y À Vélo" ! Cerfacs is on the podium for its cycling regularity during the "Allons-Y À Vélo" period (May 25 - June 25) in its category (100-500 employees).During this period, 37% of Cerfacs employees came to work by bike during at least 4 consecutive days. "Allons-Y À Vélo" is a campaign organised by the association "2 Pieds 2 Roues" and "La Maison du Vélo de Toulouse" to promote the use of the bicycle for every day travels; all details can be found on allonsyavelo.le-pic.org . Cerfacs encourages its employees to use their bicycle to come to work as they benefit from the bicycle mileage allowance (FMD for Forfait Mobilité Durable) of up to 500 Euros per year.Read more

The H2OPE project wins the prize Joseph Fourier 2021

CERFACS |  26 July 2021

The H2OPE project wins the prize Joseph Fourier 2021 The prize, launched by Atos and GENCI, aims to reward the work of researchers, academics and industry in two strategic areas: Advanced Computing (HPC, Quantum, Edge) and Artificial Intelligence, and, in the 2021 edition , gives particular importance to Decarbonation. The 1st Prize was awarded to the H2OPE or “H2OPErability for safe and clean gas turbine engines” project from CERFACS in Toulouse. This project aims, via the LES AVBP code, to model at high resolution a mixed combustion process associating conventional fuels with hydrogen (bi-fuels) as one of the most promising technical solutions to achieve "net zero emissions" of CO2 in the industrial sector. It was presented by Walter Agostinelli, Davide Laera, Laurent Gicquel, and Thierry Poinsot. Press release :Read more

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From 11 October 2021 to 14 October 2021

Machine learning for data science





The 14 October 2021 from 14h00 to 23h59

Tribute to Françoise CHATELIN

Distanciel et Présentiel, salle JCA, Cerfacs, Toulouse |  



Carmona, J., Odier, N., Desjardins, O., Cuenot, B., Misdariis, A. and Cayre, A. (2021) A Comparative Study of Direct Numerical Simulation and Experimental Results on a Prefilming Airblast Atomization Configuration, Atomization and Sprays, 31 (8), pp. 9-32, doi:10.1615/AtomizSpr.2021037399

[url] [doi]

@ARTICLE{AR-CFD-21-83, author = {Carmona, J. and Odier, N. and Desjardins, O. and Cuenot, B. and Misdariis, A. and Cayre, A. }, title = {A Comparative Study of Direct Numerical Simulation and Experimental Results on a Prefilming Airblast Atomization Configuration}, year = {2021}, number = {8}, volume = {31}, pages = {9-32}, doi = {10.1615/AtomizSpr.2021037399}, journal = {Atomization and Sprays}, abstract = {Liquid injection systems play a key role in the control of flame stability and reduction of pollutant emissions in aircraft engines. However, the disintegration process of the liquid fuel is not completely understood. In that context, direct numerical simulations can be helpful but tend to be very costly. Indeed, they require high spatial resolution to accurately capture complex phenomena such as liquid-gas interface instabilities and primary atomization process with liquid bags, ligaments, and droplets formation. This paper presents a computational study of a prefilming atomizer where relevant di-mensionless parameters are chosen to reproduce realistic conditions while limiting CPU cost. The experiment under study is an academic configuration from KIT-ITS in which a liquid film is injected along a prefilmer plate surrounded by high-speed air flow. The simulation has been performed with the incompressible solver NGA using a volume of fluid method coupled with a piecewise linear interface calculation technique for interface reconstruction. Qualitative and quantitative analyses are carried out and show very good agreement between simulation and experiment. The main physical phenomena such as film instabilities, liquid accumulation process at the prefilmer edge, and primary breakup mechanisms are well recovered by the simulation and in agreement with the experiment. A consistent method to compare both the experiment and the numerical simulation based on frame analysis is developed to extract the droplet diameter distribution. The resulting size distribution evaluated from simulation is shown to be in good agreement with experimental data validating our proposed methodology to reduce computational cost. }, keywords = {Atomization, prefilming airblast, liquid film, ligament-breakup, bag-breakup, droplet size distribution, direct numerical simulation, volume of fluid}, url = {https://www.dl.begellhouse.com/pt/journals/6a7c7e10642258cc,665548b84602ecc4,5d21940029f6ebd3.html#}}

Cazères, Q., Pepiot, P., Riber, E. and Cuenot, B. (2021) A fully automatic procedure for the analytical reduction of chemical kinetics mechanisms for Computational Fluid Dynamics applications, Fuel, 303, pp. 121247, doi:10.1016/j.fuel.2021.121247


@ARTICLE{AR-CFD-21-74, author = {Cazères, Q. and Pepiot, P. and Riber, E. and Cuenot, B. }, title = {A fully automatic procedure for the analytical reduction of chemical kinetics mechanisms for Computational Fluid Dynamics applications}, year = {2021}, volume = {303}, pages = {121247}, doi = {10.1016/j.fuel.2021.121247}, journal = {Fuel}, abstract = {A new software called ARCANE has been developed to address the broad need for compact, computationally efficient chemical models for reactive flow simulations. Based on a new, fully automatic and optimised multi-step reduction methodology, ARCANE's purpose is to provide a convenient and more accessible framework for the analysis and reduction of chemical kinetic mechanisms in the general context of combustion chemistry. The capabilities and performance of the methodology are demonstrated through 3 case studies. First, a classical methane/air system with and without nitrogen/oxygen chemistry is studied as a benchmark. The framework is then applied to a kerosene/air mechanism with a multi-component fuel formulation, showing the ability of the fully automatic method to handle complex chemistry. Finally, the generality of the approach is confirmed by developing reduced chemical models for a hydrocarbon steam cracking process.}, keywords = {Chemical kinetics reduction, ARCANE, Analytically reduced chemistry}}

Lamidel, D., Daviller, G., Roger, M. and Posson, H. (2021) Numerical Prediction of the Aerodynamics and Acoustics of aTip Leakage Flow Using Large-Eddy Simulation, International Journal of Turbomachinery, Propulsion and Power, 6 (3), pp. article number 27, doi:10.3390/ijtpp6030027

[pdf] [doi]

@ARTICLE{AR-CFD-21-82, author = {Lamidel, D. and Daviller, G. and Roger, M. and Posson, H. }, title = {Numerical Prediction of the Aerodynamics and Acoustics of aTip Leakage Flow Using Large-Eddy Simulation}, year = {2021}, number = {3}, volume = {6}, pages = {article number 27}, doi = {10.3390/ijtpp6030027}, journal = {International Journal of Turbomachinery, Propulsion and Power}, abstract = {A Large-Eddy Simulation of the tip leakage flow of a single airfoil is carried out. Theconfiguration consists of a non-rotating, isolated airfoil between two horizontal plates with a gap of10 mm between the tip of the airfoil and the lower plate. The Mach number of the incoming flow is0.2, and the Reynolds number based on the chord is 9.3×105. The objective of the present studyis to investigate the best way to compute both the aerodynamics and acoustics of the tip leakageflow. In particular, the importance of the inflow conditions on the prediction of the tip leakage vortexand the airfoil loading is underlined. On the other hand, the complex structure of the tip leakagevortex and its convection along the airfoil was recovered due to the use of a mesh adaptation basedon the dissipation of the kinetic energy. Finally, the ability of the wall law to model the flow in the tipleakage flow region was proven in terms of wall pressure fluctuations and acoustics in the far-field.}, keywords = {Large-eddy simulation, fan noise, tip leakage flow, tip clearance noise}, pdf = {https://cerfacs.fr/wp-content/uploads/2021/07/Lamidel_AR-CFD-21-82.pdf}}

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, doi:10.1088/1361-6595/ac0a4a


@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}, 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}}

Saint-Martin, D., Geoffroy, O., Voldoire, A., Cattiaux, J., Brient, F., Chauvin, F., Chevalier, M., Colin, J., Decharme, B., Delire, C., Douville, H., Guérémy, F., Joetzjer, E., Ribes, A., Roehrig, R., Terray, L. and Valcke, S. (2021) Tracking Changes in Climate Sensitivity in CNRM Climate Models, Journal of Advances in Modeling Earth Systems, 13 (6), pp. e2020MS002190, doi:10.1029/2020MS002190

[pdf] [doi]

@ARTICLE{AR-CMGC-21-75, author = {Saint-Martin, D. and Geoffroy, O. and Voldoire, A. and Cattiaux, J. and Brient, F. and Chauvin, F. and Chevalier, M. and Colin, J. and Decharme, B. and Delire, C. and Douville, H. and Guérémy, F. and Joetzjer, E. and Ribes, A. and Roehrig, R. and Terray, L. and Valcke, S. }, title = {Tracking Changes in Climate Sensitivity in CNRM Climate Models}, year = {2021}, number = {6}, volume = {13}, pages = {e2020MS002190}, doi = {10.1029/2020MS002190}, journal = {Journal of Advances in Modeling Earth Systems}, pdf = {https://cerfacs.fr/wp-content/uploads/2021/06/Globc-AR-Terray-J.Adv_.Model_.EarthSyst-21-75.pdf}}

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Hydrogen-based and AI-assisted turbulent combustion models for sustainable helicopter aircraft engines


Contexte Le Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) travaille à...Read more

Simulation of hydrogen safety scenarios in future aircraft configurations (AIRBUS/CERFACS)


The introduction of hydrogen in the aircraft of the future raises various issues linked to safety...Read more