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 première bourse ERC (European Research Council) Starting Grant pour Benedetta Franzelli

12 septembre 2017

Benedetta Franzelli fait partie des lauréats du concours (European Research Council) Starting Grant 2017 de la communauté Européenne (erc.europa.eu/sites/default/files/document/file/erc_2017_stg_results_pe.pdf). Benedetta Franzelli a obtenu son doctorat en combustion au CERFACS en 2011. Elle...Lire la suite


Les canicules extrêmes en France dans la deuxième moitié du 21ième siècle et le seuil de 50°C

24 août 2017

Margot Bador (chercheur au Climate Change Research Center, Sydney et ancienne doctorante CERFACS), Laurent Terray (chercheur au CERFACS) et Julien Boé (chercheur CNRS au CERFACS), en collaboration avec des équipes de Météo-France, ont publié dans la revue Environmental Research Letters une...Lire la suite

Toute l'actualité

NOS PUBLICATIONS

Ruprich-Robert, Y., Msadek, R., Castruccio, F., Yeager, S., Delworth, T. and Danabasoglu, G. (2017) Assessing the Climate Impacts of the Observed Atlantic Multidecadal Variability Using the GFDL CM2.1 and NCAR CESM1 Global Coupled Models, Journal of Climate, 30, pp. 2785-2810, doi:10.1175/JCLI-D-16-0127.s1

[pdf] [Supplementary Material] [doi]

@ARTICLE{AR-CMGC-17-153, author = {Ruprich-Robert, Y. and Msadek, R. and Castruccio, F. and Yeager, S. and Delworth, T. and Danabasoglu, G. }, title = {Assessing the Climate Impacts of the Observed Atlantic Multidecadal Variability Using the GFDL CM2.1 and NCAR CESM1 Global Coupled Models}, year = {2017}, volume = {30}, pages = {2785-2810}, doi = {10.1175/JCLI-D-16-0127.s1}, journal = {Journal of Climate}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/09/GLOBC-Article-Ruprich_JOC_sept-2017.pdf}, supplementaryMaterial = {http://cerfacs.fr/wp-content/uploads/2017/09/GOBC-Article-RUPRICH-SI-Sept-2017.pdf.docx}}

Bushuk, M., Msadek, R., Winton, M., Vecchi, G. A., Gudgel, R., Rosati, A. and Yang, X. (2017) Skillful regional prediction of Arctic sea ice on seasonal timescales, Geophysical Research Letters, pp. 4953-4964, doi:10.1002/2017GL073155

[pdf] [doi]

@ARTICLE{AR-CMGC-17-154, author = {Bushuk, M. and Msadek, R. and Winton, M. and Vecchi, G.A. and Gudgel, R. and Rosati, A. and Yang, X. }, title = {Skillful regional prediction of Arctic sea ice on seasonal timescales}, year = {2017}, pages = {4953-4964}, doi = {10.1002/2017GL073155}, journal = {Geophysical Research Letters}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/09/GLOBC-Article-Bushuk_GRL_-Sept-2017.pdf}}

Daroukh, M., Moreau, S., Gourdain, N., Boussuge, J. -F. and Sensiau, C. (2017) Effect of Distortion on Turbofan Tonal Noise at Cutback with Hybrid Methods, International Journal of Turbomachinery, Propulsion and Power, 2 (3), pp. 16, doi:10.3390/ijtpp2030016

[pdf] [doi]

@ARTICLE{AR-CFD-17-155, author = {Daroukh, M. and Moreau, S. and Gourdain, N. and Boussuge, J.-F. and Sensiau, C. }, title = {Effect of Distortion on Turbofan Tonal Noise at Cutback with Hybrid Methods}, year = {2017}, number = {3}, volume = {2}, pages = {16}, doi = {10.3390/ijtpp2030016}, journal = {International Journal of Turbomachinery, Propulsion and Power}, abstract = { New ultra high bypass ratio architectures may significantly affect the fan tonal noise of future aircraft engines. Indeed, such a noise source is supposed to be dominated by the interaction of fan-blade wakes with outlet guide vanes. However, shorter nacelles in these engines are expected to trigger an important air-inlet distortion that can be responsible for new acoustic sources on the fan blades. Full annulus simulations based on the unsteady Reynolds-averaged Navier–Stokes equations are presently used to study this effect. Simulation results show that the air-inlet distortion has a main effect in the fan-tip region, leading to a strong variation of the fan-blade unsteady loading. It also significantly modifies the shape of the fan-blade wakes and, consequently, the unsteady loading of the outlet guide vanes. Acoustic predictions based on the extension of Goldstein’s analogy to an annular duct in a uniform axial flow are presented and show that the fan sources notably contribute to the fan tonal noise. The air-inlet distortion is responsible for an increase of the noise radiated by both the fan and the outlet guide vane sources, leading to a global noise penalty of up to three decibels.}, keywords = {AAM, ELSA}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/09/Daroukh_IJTPP_2017.pdf}}

Coreixas, C., Wissocq, G., Puigt, G., Boussuge, J. -F. and Sagaut, P. (2017) Recursive regularization step for high-order lattice Boltzmann methods, Physical Review E, 96 (3), pp. 033306 (1-22), doi:10.1103/PhysRevE.96.033306

[doi]

@ARTICLE{AR-CFD-17-140, author = {Coreixas, C. and Wissocq, G. and Puigt, G. and Boussuge, J.-F. and Sagaut, P. }, title = {Recursive regularization step for high-order lattice Boltzmann methods}, year = {2017}, number = {3}, volume = {96}, pages = {033306 (1-22)}, doi = {10.1103/PhysRevE.96.033306}, journal = {Physical Review E}, abstract = {A lattice Boltzmann method (LBM) with enhanced stability and accuracy is presented for various Hermite tensor-based lattice structures. The collision operator relies on a regularization step, which is here improved through a recursive computation of non-equilibrium Hermite polynomial coefficients. In addition to the reduced computational cost of this procedure with respect to the standard one, the recursive step allows to considerably enhance the stability and accuracy of the numerical scheme by properly filtering out second- (and higher-) order non-hydrodynamic contributions in under-resolved conditions. This is first shown in the isothermal case where the simulation of the doubly periodic shear layer is performed with a Reynolds number ranging from $10^4$ to $10^6$, and where a thorough analysis of the case at $Re=3\times 10^4$ is conducted. In the latter, results obtained using both regularization steps are compared against the BGK-LBM for standard (D2Q9) and high-order (D2V17 and D2V37) lattice structures, confirming the tremendous increase of stability range of the proposed approach. Further comparisons on thermal and fully compressible flows, using the general extension of this procedure, are then conducted through the numerical simulation of Sod shock tubes with the D2V37 lattice. They confirm the stability increase induced by the recursive approach as compared with the standard one. }}

Duchaine, F., Dombard, J., Gicquel, L. Y. M. and Koupper, C. (2017) On the importance of inlet boundary conditions for aerothermal predictions of turbine stages with Large Eddy Simulation, Computers and Fluids, 154 (September), pp. 60-73, doi:10.1016/j.compfluid.2017.05.024

[url] [doi]

@ARTICLE{AR-CFD-17-89, author = {Duchaine, F. and Dombard, J. and Gicquel, L.Y.M. and Koupper, C. }, title = {On the importance of inlet boundary conditions for aerothermal predictions of turbine stages with Large Eddy Simulation}, year = {2017}, number = {September}, volume = {154}, pages = {60-73}, doi = {10.1016/j.compfluid.2017.05.024}, journal = {Computers and Fluids}, abstract = {The analysis of a combustion chamber effects on the aerodynamics and thermal loads applied on a turbine stage is proposed. To do so, an integrated wall-modeled Large-Eddy Simulation of a combustion chamber simulator along with its high pressure turbine stage is performed and compared to a standalone turbine stage computation operated under the same mean conditions. For the standalone stage simulations, a parametric study of the turbulence injected at the turbine stage inlet is also discussed. For this specific configuration and with the mesh resolution used, results illustrate that the aerodynamic expansion of the turbine stage is almost insensitive to the inlet turbulent conditions. However, the temperature distribution in the turbine passages as well as on the stator and rotor walls are highly impacted by these inlet conditions underlying the importance of inlet conditions in turbine stage computations and the potential of integrated combustion chamber/turbine simulations in such a context.}, url = {https://doi.org/10.1016/j.compfluid.2017.05.024}}

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LE CERFACS RECRUTE

CFD: couplage de code pour simulations HPC

 

Contexte Le Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS) travaille à la résolution, par la...Lire plus


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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