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

Deux propositions du Cerfacs acceptées dans le 14ème appel PRACE

4 avril 2017

Le CERFACS a obtenu deux allocations PRACE au dernier appel: le code LES combustion AVBP y sera employé pour traiter deux problèmes très différents: le projet "Large Eddy Simulation of the Deflagration to Detonation Transition » (en collaboration avec TOTAL) traitera des explosions dans les...Lire la suite


Articles de médiation scientifique dans le journal « The Conversation »

31 mars 2017

Parmi les missions des chercheurs et des ingénieurs du Cerfacs figure la diffusion des résultats scientifiques à tous les niveaux, des journaux scientifiques spécialisés aux médias destinés au grand public. C'est dans cet esprit que le Cerfacs a choisi le journal en ligne "The Conversation"...Lire la suite

Toute l'actualité

NOS PUBLICATIONS

Monerie, P. A., Sanchez-Gomez, E. and Boé, J. (2017) On the range of future Sahel precipitation projections and the selection of a sub-sample of CMIP5 models for impact studies, Climate Dynamics, 48 (7), pp. 2751–2770, doi:10.1007/s00382-016-3236-y

[url] [doi]

@ARTICLE{AR-CMGC-17-28, author = {Monerie, P.A. and Sanchez-Gomez, E. and Boé, J. }, title = {On the range of future Sahel precipitation projections and the selection of a sub-sample of CMIP5 models for impact studies}, year = {2017}, number = {7}, volume = {48}, pages = {2751–2770}, doi = {10.1007/s00382-016-3236-y}, journal = {Climate Dynamics}, url = {https://link.springer.com/article/10.1007/s00382-016-3236-y}}

Daviller, G., Brebion, M., Xavier, P., Staffelbach, G., Mueller, J. -D. and Poinsot, T. (2017) A mesh adaptation strategy to predict pressure losses in LES of swirled flows, Flow Turbulence and Combustion, doi:10.1007/s10494-017-9808-z

[pdf] [url] [doi]

@ARTICLE{AR-CFD-17-66, author = {Daviller, G. and Brebion, M. and Xavier, P. and Staffelbach, G. and Mueller, J.-D. and Poinsot, T. }, title = {A mesh adaptation strategy to predict pressure losses in LES of swirled flows}, year = {2017}, doi = {10.1007/s10494-017-9808-z}, journal = {Flow Turbulence and Combustion}, abstract = {Large-Eddy Simulation (LES) has become a potent tool to investigate instabilities in swirl flows even for complex, industrial geometries. However, the accurate prediction of pressure losses on these complex flows remains difficult. The paper identifies localised near-wall resolution issues as an important factor to improve accuracy and proposes a solution with an adaptive mesh h-refinement strategy relying on the tetrahedral fully automatic MMG3D library of Dapogny et al. (J. Comput. Phys. 262, 358-378, 2014) using a novel sensor based on the dissipation of kinetic energy. Using a joint experimental and numerical LES study, the methodology is first validated on a simple diaphragm flow before to be applied on a swirler with two counter-rotating passages. The results demonstrate that the new sensor and adaptation approach can effectively produce the desired local mesh refinement to match the target losses, measured experimentally. Results shows that the accuracy of pressure losses prediction is mainly controlled by the mesh quality and density in the swirler passages. The refinement also improves the computed velocity and turbulence profiles at the swirler outlet, compared to PIV results. The significant improvement of results confirms that the sensor is able to identify the relevant physics of turbulent flows that is essential for the overall accuracy of LES. Finally, in the appendix, an additional comparison of the sensor fields on tetrahedral and hexahedral meshes demonstrates that the methodology is broadly applicable to all mesh types.}, keywords = {LES, swirl injector, pressure losses, adaptive mesh refinement}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/04/davilleretal_FTaC_2017.pdf}, url = {http://link.springer.com/article/10.1007%2Fs10494-017-9808-z}}

Costantino, L., Cuesta, J., Emili, E. and et al. (2017) Potential of multispectral synergism for observing ozone pollution by combining IASI-NG and UVNS measurements from the EPS-SG satellite, Atmospheric Measurement Techniques, 10 (4), pp. 1281-1298, ISSN 1867-8548, doi:10.5194/amt-10-1281-2017

[url] [doi]

@ARTICLE{AR-AE-17-56, author = {Costantino, L. and Cuesta, J. and Emili, E. and et al.}, title = {Potential of multispectral synergism for observing ozone pollution by combining IASI-NG and UVNS measurements from the EPS-SG satellite}, year = {2017}, number = {4}, volume = {10}, pages = {1281-1298}, issn = {1867-8548}, doi = {10.5194/amt-10-1281-2017}, journal = {Atmospheric Measurement Techniques}, url = {http://dx.doi.org/10.5194/amt-10-1281-2017}}

Will, A., Akhtar, N., Brauch, J., Breil, M., Davin, E., Ho-Hagemann, H. T. M., Maisonnave, E., Thürkow, M. and Weiher, S. (2017) The COSMO-CLM 4.8 regional climate model coupled to regional ocean, land surface and global earth system models using OASIS3-MCT: description and performance, 10 (4), pp. 1549-1586, doi:10.5194/gmd-10-1549-2017

[doi]

@ARTICLE{AR-CMGC-17-67, author = {Will, A. and Akhtar, N. and Brauch, J. and Breil, M. and Davin, E. and Ho-Hagemann, H.T.M. and Maisonnave, E. and Thürkow, M. and Weiher, S. }, title = {The COSMO-CLM 4.8 regional climate model coupled to regional ocean, land surface and global earth system models using OASIS3-MCT: description and performance}, year = {2017}, number = {4}, volume = {10}, pages = {1549-1586}, doi = {10.5194/gmd-10-1549-2017}}

Le Bras, S., Deniau, H., Bogey, C. and Daviller, G. (2017) Development of compressible large-eddy simulations combining high-order schemes and wall modeling, AIAA Journal, 55 (4), pp. 1152-1163

[pdf] [url]

@ARTICLE{AR-CFD-17-3, author = {Le Bras, S. and Deniau, H. and Bogey, C. and Daviller, G. }, title = {Development of compressible large-eddy simulations combining high-order schemes and wall modeling}, year = {2017}, number = {4}, volume = {55}, pages = {1152-1163}, journal = {AIAA Journal}, abstract = { Compressible Large Eddy-Simulations (LES) combining high-order methods with a wall model have been developed in order to compute wall-bounded flows at high Reynolds numbers. The high-order methods consist of low-dissipation and low-dispersion implicit finite-volume schemes for spatial discretization on structured grids. In a first part, the procedure used to apply these schemes in near-wall regions is presented. It is based on a ghost cell reconstruction. Its validity is assessed by performing the LES of a turbulent channel flow at a friction Reynolds number of Reτ = 395. In a second part, to consider flows at higher Reynolds numbers, an LES approach using a wall model is proposed. The coupling between the wall model and the high-order schemes is described. The performance of the approach is evaluated by simulating a turbulent channel flow at Reτ = 2000 using meshes with grid spacings ∆x+ = 100, 200, 300 in the streamwise direction, and ∆+ = 50, 100 and 150 in the wall-normal and spanwise directions, in wall units. The effects of the choice of the point used for data exchange between the wall model and the LES algorithm, and of the positions of the ghost cells used for the coupling are examined by performing additional computations in which these parameters vary. The results are in agreement with Direct Numerical Simulation (DNS) data. In particular, the turbulent intensities obtained in the logarithmic region of the boundary layers of the channel flow are successfully predicted.}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/04/CFD_LeBras_AIAAJ17.pdf}, url = {http://dx.doi.org/10.2514/1.J055107}}

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LE CERFACS RECRUTE

Méthodes d'ensemble pour la réanalyse de modèle de réservoir

 

Le Cerfacs recrute un chercheur ou une chercheuse ayant de l’expérience en assimilation de données, si possible...

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Bruit de combustion

 

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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