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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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Tribute to Françoise Chatelin

Brigitte Yzel |  23 July 2021

  Tribute to Françoise CHATELIN   Virtual & Face to Face event @ Cerfacs 14 October 2021, CERFACS, Toulouse (France) 2 pm - 6.30 pm   Cerfacs is organizing a half scientific day on Thursday October 14, 2021 in tribute to Françoise Chatelin who left us prematurely on May 14, 2020   After graduating from the Ecole Normale Supérieure in Paris (1960-63), and her PhD in Mathematics at Grenoble University (1971) , Françoise Chatelin led with worldwide recognition her research in many areas, from spectral theory for linear operators in Banach spaces and finite precision to Dickson algebras. Professor Chatelin taught at the Universities Grenoble 2 - Pierre Mendès-France and Paris 9 - Dauphine before moving to Toulouse in 1996. She became Emeritus Professor in 2015. She was a visiting researcher at Berkeley and Stanford Universities, IBM San Jose (Ca) and Yorktown Heights (NY). For almost a decade, she was a scientific manager in Industry (in charge of intensive computing) first at the Centre Scientifique IBM France in Paris (1985 -1992) and then in the Central Research Lab of Thales (known as Thomson-CSF at that time) near Paris (1992-95). Françoise Chatelin was Head of the Qualitative Computing group at the Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (Cerfacs) in Toulouse, France. Professor Chatelin has authored four books; the first three are now classic references available from SIAM. Her second book Valeurs Propres de Matrices (Masson, Paris, 1988) has received the IBM - France prize for « Best Scientific and technical publication 1988 ». Beyond her scientific contribution, Françoise Chatelin played a structuring role on research at CERFACS through multiple thesis on innovative topics. This event is devoted to the human and scientific tribute of her life. As a faithful image of the active and passionate woman that...Read more

CERFACS is involved in the NextSim project

CERFACS |  19 July 2021

The primary objective is to increase the capabilities of Computational Fluid Dynamics tools on extreme-scale parallel computing platforms for aeronautical design. The Kick-Off Meeting took place on 12 March 2021. This project has received funding from the European High-Performance Computing Joint Undertaking (JU) under grant agreement N° 956104. The JU receives support from the European Union’s Horizon 2020 research and innovation programme and Spain, France, Germany. For more information, please visit  EuroHPC website : Project webpage :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 |  



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}}

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#}}

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

Quantifiying particle deposition on solar panels (soiling) with large eddy simulation


Context The European Center for Research and Advanced Training in Scientific Computation (CERFACS) aims to solve,...Read more