Cerfacs Entrez dans le monde de la haute performance...

Le Cerfacs en bref

Centre de recherche fondamentale et appliquée spécialisé dans la modélisation et la simulation numériques, également centre de formation avancée, le Cerfacs, par ses moyens et son savoir-faire en calcul haute performance, traite des grands problèmes scientifiques et techniques de recherche publique et industrielle sur les secteurs suivants: AERONAUTIQUE&AUTOMOBILEESPACEENERGIEENVIRONNEMENT&CLIMAT
Ses effectifs sont de l'ordre de 100-150 chercheurs, ingénieurs et administratifs.

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LES ACTUALITÉS

La session plénière Hottel sera donnée par Thierry Poinsot au 36ème symposium de la combustion à Séoul en Corée en 2016

23 mai 2016

La session plénière Hottel sera donnée par Thierry Poinsot au 36ème symposium de la combustion à Séoul en Corée en 2016

La conférence invitée Hottel est la plus prestigieuse des conférences plénières en combustion. Elle ouvre les Symposiums sur la combustion organisés par le Combustion Institute tous les deux ans. Ces symposiums sont les plus compétitifs du monde de la combustion avec un taux d'acceptation de...Lire la suite


Une publication dans Nature Climate Change

17 avril 2016

L’impact facteur de 14,5 du journal « Nature Climate Change » le classe premier dans la catégorie « Météorologie et Sciences Atmosphérique ». C’est dans ce journal que Christophe CASSOU, chercheur CNRS au Cerfacs, a publié, en collaboration avec un chercheur CNRS de Météo-France, un...Lire la suite

Toute l'actualité

NOS PUBLICATIONS

Tseng, Y. -H., Lin, H., Chen, H. -C., Thompson, K., Bentsen, M., Böning, C., Bozec, A., Cassou, C., Chassignet, E. P., Chow, C. H., Danabasoglu, G., Danilov, S., Fameti, R., Fogli, P. G., Fujii, Y., Griffies, S. M., Ilicak, M., Jung, T., Masina, S., Navarra, A., Patara, L., Samuels, B. L., Scheinert, M., Sidorenko, D., Sui, C. -H., Tsujino, H., Valcke, S., Voldoire, A., Wang, Q. and Yeager, S. G. (2016) North and equatorial Pacific Ocean circulation in the CORE-II hindcast simulations, Ocean Modelling, 104, pp. 143-170, doi:10.1016/j.ocemod.2016.06.003

[url] [doi]

@ARTICLE{AR-CMGC-16-159, author = {Tseng, Y.-H. and Lin, H. and Chen, H.-C. and Thompson, K. and Bentsen, M. and Böning, C. and Bozec, A. and Cassou, C. and Chassignet, E.P. and Chow, C.H. and Danabasoglu, G. and Danilov, S. and Fameti, R. and Fogli, P.G. and Fujii, Y. and Griffies, S.M. and Ilicak, M. and Jung, T. and Masina, S. and Navarra, A. and Patara, L. and Samuels, B.L. and Scheinert, M. and Sidorenko, D. and Sui, C.-H. and Tsujino, H. and Valcke, S. and Voldoire, A. and Wang, Q. and Yeager, S.G. }, title = {North and equatorial Pacific Ocean circulation in the CORE-II hindcast simulations}, year = {2016}, volume = {104}, pages = {143-170}, doi = {10.1016/j.ocemod.2016.06.003}, journal = {Ocean Modelling}, url = {http://www.sciencedirect.com/science/article/pii/S146350031630052X}}

de Laborderie, J. and Moreau, S. (2016) Prediction of tonal ducted fan noise, Journal of Sound and Vibration, 372 (june), pp. 105–132, doi:10.1016/j.jsv.2016.02.032

[url] [doi]

@ARTICLE{AR-CFD-16-49, author = {de Laborderie, J. and Moreau, S. }, title = {Prediction of tonal ducted fan noise}, year = {2016}, number = {june}, volume = {372}, pages = { 105–132}, doi = {10.1016/j.jsv.2016.02.032}, journal = {Journal of Sound and Vibration}, abstract = {This study introduces an analytical model aiming at predicting the tonal acoustic sources generated and radiated by the rotor-stator interaction in a fan stage. This model is able to cope with complex three-dimensional stator geometries and it fully accounts for cascade effects, characteristic of modern fan stages. It is based on a proper description of the rotor wake coupled with an analytic cascade response function and with an acoustic analogy. The proposed model is validated for the first time against acoustic sources and sound power measurements, on the Advanced Noise Control Fan from NASA. On this configuration representative of an actual fan stage, the model is shown to predict tonal sources and powers accurately, in function of the rotational velocity and of the stator-vane count. Another realistic configuration, namely the low-pressure CME2 research compressor, is then considered in order to demonstrate the suitability of the model to be used as a design tool in an industrial context. A parametric study concerning both the stator vane sweep and lean angles is performed on this rotor-stator stage. The model produces predictions consistent with studies from literature, quantifying the effectiveness of swept and leaned vanes as a tonal noise reduction mechanism. This parametric study allows defining an optimal stator design for minimal noise emission.}, keywords = {Total noise, Rotor-stator interaction, Cascade model, Acoustic optimisation}, url = {http://www.sciencedirect.com/science/journal/0022460X}}

Pechereau, F., Bonaventura, Z. and BOURDON, A. (2016) Influence of surface emission processes on a fast-pulsed dielectric barrier discharge in air at atmospheric pressure, Plasma Sources Science and Technology, 25 (June), pp. 44004, doi:10.1088/0963-0252/25/4/044004

[doi]

@ARTICLE{AR-CFD-16-152, author = {Pechereau, F. and Bonaventura, Z. and BOURDON, A. }, title = {Influence of surface emission processes on a fast-pulsed dielectric barrier discharge in air at atmospheric pressure}, year = {2016}, number = {June}, volume = {25}, pages = {044004 }, doi = {10.1088/0963-0252/25/4/044004 }, journal = {Plasma Sources Science and Technology}, abstract = {: This paper presents simulations of an atmospheric pressure air discharge in a point-to-plane geometry with a dielectric layer parallel to the cathode plane. Experimentally, a discharge reignition in the air gap below the dielectrics has been observed. With a 2D fluid model, it is shown that due to the fast rise of the high voltage applied and the sharp point used, a first positive spherical discharge forms around the point. Then this discharge propagates axially and impacts the dielectrics. As the first discharge starts spreading on the upper dielectric surface, in the second air gap with a low preionization density of 104cm−3, the 2D fluid model predicts a rapid reignition of a positive discharge. As in experiments, the discharge reignition is much slower, a discussion on physical processes to be considered in the model to increase the reignition delay is presented. The limit case with no initial seed charges in the second air gap has been studied. First, we have calculated the time to release an electron from the cathode surface by thermionic and field emission processes for a work function   [3, 4] eV and an amplification factor   [100, 220]. Then a 3D Monte Carlo model has been used to follow the dynamics of formation of an avalanche starting from a single electron emitted at the cathode. Due to the high electric field in the second air gap, we have shown that in a few nanoseconds, a Gaussian cloud of seed charges is formed at a small distance from the cathode plane. This Gaussian cloud has been used as the initial condition of the 2D fluid model in the second air gap. In this case, the propagation of a double headed discharge in the second air gap has been observed and the reignition delay is in rather good agreement with experiments. }}

Gressens, A., Sauvage, B., Cariolle, D., Evans, M. J., Leriche, M., Mari, C. and Thouret, V. (2016) Modeling lightning-NOx chemistry on a sub-grid scale in a global chemical transport model, Atmospheric Chemistry and Physics, 16 (9), pp. 5867-5889, doi:10.5194/acp-16-5867-2016

[url] [doi]

@ARTICLE{AR-AE-16-131, author = {Gressens, A. and Sauvage, B. and Cariolle, D. and Evans, M.J. and Leriche, M. and Mari, C. and Thouret, V. }, title = {Modeling lightning-NOx chemistry on a sub-grid scale in a global chemical transport model}, year = {2016}, number = {9}, volume = {16}, pages = {5867-5889}, doi = {10.5194/acp-16-5867-2016}, journal = {Atmospheric Chemistry and Physics}, url = {http://www.atmos-chem-phys.net/16/5867/2016/}}

Papadogiannis, D., Duchaine, F., Gicquel, L. Y. M., Wang, G. and Moreau, S. (2016) Effects of Subgrid Scale Modeling on the Deterministic and Stochastic Turbulent Energetic Distribution in Large-Eddy Simulations of a High-Pressure Turbine Stage, Journal of Turbomachinery, 138 (9), pp. 091005-091005-10, doi:10.1115/1.4032844

[url] [doi]

@ARTICLE{AR-CFD-16-137, author = {Papadogiannis, D. and Duchaine, F. and Gicquel, L.Y.M. and Wang, G. and Moreau, S. }, title = {Effects of Subgrid Scale Modeling on the Deterministic and Stochastic Turbulent Energetic Distribution in Large-Eddy Simulations of a High-Pressure Turbine Stage}, year = {2016}, number = {9}, volume = {138}, pages = {091005-091005-10}, doi = {10.1115/1.4032844}, journal = {Journal of Turbomachinery}, abstract = {This study focuses on the engine-representative MT1 transonic high-pressure turbine. Simulated by use of wall-modeled large-eddy simulations (LES) with three different subgrid scale (SGS) closures, mean pressure profiles across the blades as well as mean radial profiles at the rotor exit are found to be in good agreement with experimental data with only local differences between models. Unsteady flow features, inherently present in LES, are however affected by SGS modeling. This is evidenced by the relative energetic content of the deterministic to stochastic turbulent contributions evaluated, thanks to the triple decomposition analysis of the simulations. Origins of such differences are found to impact the entire radial distribution of the flow and activity, with deterministic and chaotic contributions distributed differently depending on the SGS model and reference frequency used to extract the deterministic signal. Such flow responses can be attributed to the different SGS capacities to satisfy basic turbulent flow features that translate in different dissipative and turbulent diffusive contributions of the three SGS models.}, url = {http://turbomachinery.asmedigitalcollection.asme.org/issue.aspx?journalid=135&issueid=935195&direction=P}}

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LE CERFACS RECRUTE

Codes acoustiques pour prévoir les instabilités de combustion dans les turbines à gaz

17 juillet 2016 |  

Required Education / Niveau requis

Master ou Ecole d'ingénieur

Contexte

Les turbines à gaz peuvent exhiber de puissantes instabilités de...

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Bruit de combustion

1 octobre 2015 |  

Le bruit émis par les moteurs d'avion est devenu un problème majeur sur de nombreux aéroports. Le CERFACS développe avec SAFRAN une technique...

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