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Cerfacs in brief

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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CERFACS is partner in the “Chaire ANR industrielle” POSEIDON, inaugurated january 27th at Ecole Polytechnique

superadmin |  14 March 2017

POSEIDON, one of the 5 « Chaires ANR industrielles » selected in 2016, is interested in « New plasma thrusters for satellites in low Earth orbit ». Coordinated by Anne Bourdon from the Laboratoire de Physique des Plasmas, this project gathers Ecole Polytechnique, CNRS and Safran Aircraft...Read more

Le train du climat revient en 2017

ROGEL |  9 March 2017

Le Train du Climat crée un espace pédagogique de rencontre entre scientifiques et citoyens autour du changement climatique. La saison 1 avait été un succès dans le contexte de la COP21. Voici la saison 2, qui mobilise cette fois encore plusieurs ingénieurs et chercheurs du...Read more

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Tommasi, D., Stock, C. A., Hobday, A. J., Methot, R., Kaplan, I. C., Eveson, J. P., Holsman, K., Miller, T. J., Gaichas, S., Gehlen, M., Pershing, A., Vecchi, G. A., Msadek, R., Delworth, T., Eakin, C. M., Haltuch, M. A., Séférian, R., Spillman, C. M., Hartog, J. R., Siedlecki, S., Samhouri, J. F., Muhling, B., Asch, R., Pinsky, M. L., Saba, V. S., Kapnick, S. B., Gaitan, C. F., Rykaczewski, R. R., Alexander, M. A., Xue, Y., Pegion, K. V., Lynch, P., Payne, M. R., Kristiansen, T., Lehodey, P. and Werner, F. E. (2017) Managing living marine resources in a dynamic environment : The role of seasonal to decadal climate forecasts, Progress in Oceanography (152), pp. 15-49, doi:/10.1016/j.pocean.2016.12.011

[pdf] [doi]

@ARTICLE{AR-CMGC-17-45, author = {Tommasi, D. and Stock, C.A. and Hobday, A.J. and Methot, R. and Kaplan, I.C. and Eveson, J.P. and Holsman, K. and Miller, T.J. and Gaichas, S. and Gehlen, M. and Pershing, A. and Vecchi, G.A. and Msadek, R. and Delworth, T. and Eakin, C.M. and Haltuch, M.A. and Séférian, R. and Spillman, C.M. and Hartog, J.R. and Siedlecki, S. and Samhouri, J.F. and Muhling , B. and Asch, RG. and Pinsky, M.L. and Saba, V.S. and Kapnick, S.B. and Gaitan, C.F. and Rykaczewski, R.R. and Alexander, M.A. and Xue, Y. and Pegion, K.V. and Lynch, P. and Payne, M.R. and Kristiansen, T. and Lehodey, P. and Werner, F.E. }, title = {Managing living marine resources in a dynamic environment : The role of seasonal to decadal climate forecasts}, year = {2017}, number = {152}, pages = {15-49}, doi = {/10.1016/j.pocean.2016.12.011}, journal = {Progress in Oceanography}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/03/GlobC-Article-Msadek-Mars2017.pdf}}

Vanharen, J., Puigt, G., Vasseur, X., Boussuge, J. -F. and Sagaut, P. (2016) Revisiting the spectral analysis for high-order spectral discontinuous methods, Journal of Computational Physics, 337, pp. 379–402, doi:10.1016/j.jcp.2017.02.043

[url] [doi]

@ARTICLE{AR-CFD-16-120, author = {Vanharen, J. and Puigt, G. and Vasseur, X. and Boussuge, J.-F. and Sagaut, P. }, title = {Revisiting the spectral analysis for high-order spectral discontinuous methods}, year = {2016}, volume = {337}, pages = {379–402}, doi = {10.1016/j.jcp.2017.02.043}, journal = {Journal of Computational Physics}, abstract = {The spectral analysis is a basic tool to characterise the behaviour of any convection scheme. By nature, the solution projected onto the Fourier basis enables to estimate the dissipation and the dispersion associated with the spatial discretisation of the hyperbolic linear problem. In this paper, we wish to revisit such analysis, focusing attention on two key points. The first point concerns the effects of time integration on the spectral analysis. It is shown with standard high-order Finite Difference schemes dedicated to aeroacoustics that the time integration has an effect on the required number of points per wavelength. The situation depends on the choice of the coupled schemes (one for time integration, one for space derivative and one for the filter) and here, the compact scheme with its eighth-order filter seems to have a better spectral accuracy than the considered dispersion-relation preserving scheme with its associated filter, especially in term of dissipation. Secondly, such a coupled space-time approach is applied to the new class of high-order spectral discontinuous approaches, focusing especially on the Spectral Difference method. A new way to address the specific spectral behaviour of the scheme is introduced first for wavenumbers in [0; π], following the Matrix Power method. For wavenumbers above π, an aliasing phenomenon always occurs but it is possible to understand and to control the aliasing of the signal. It is shown that aliasing depends on the polynomial degree and on the number of time steps. A new way to define dissipation and dispersion is introduced and applied to wavenumbers larger than π. Since the new criteria recover the previous results for wavenumbers below π, the new approach is an extension of all the previous ones for analysing dissipation and dispersion. Finally, since the standard Finite Difference schemes can servevas reference solution for their capability in aeroacoustics, it is shown that the Spectral Difference method is as accurate as (or even more accurate) than the considered Finite Difference schemes. }, url = {http://dx.doi.org/10.1016/j.jcp.2017.02.043}}

Bushuk, M., Msadek, R., Winton, M., Vecchi, G. A., Gudgel, R. G., Rosati, A. and Yang, X. (2017) Summer Enhancement of Arctic Sea Ice Volume Anomalies in the September-Ice Zone, Journal of Climate, 30, pp. 2341-2362, doi:10.1175/JCLI-D-16-0470.1

[pdf] [Supplementary Material] [doi]

@ARTICLE{AR-CMGC-17-48, author = {Bushuk, M. and Msadek, R. and Winton, M. and Vecchi, G.A. and Gudgel, R.G. and Rosati, A. and Yang, X. }, title = {Summer Enhancement of Arctic Sea Ice Volume Anomalies in the September-Ice Zone}, year = {2017}, volume = {30}, pages = {2341-2362}, doi = {10.1175/JCLI-D-16-0470.1}, journal = {Journal of Climate}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/03/GlobC-Article-Msadek-Summer-Mars-2017.pdf}, supplementaryMaterial = {http://cerfacs.fr/wp-content/uploads/2017/03/SM-Article-Msadek-Summer-Mars2017.pdf}}

NI, F., Brebion, M., Nicoud, F. and Poinsot, T. (2017) Accounting for Acoustic Aamping in a Helmholtz Solver, AIAA Journal, doi:10.2514/1.J055248

[pdf] [doi]

@ARTICLE{AR-CFD-17-50, author = {NI, F. and Brebion, M. and Nicoud, F. and Poinsot, T. }, title = {Accounting for Acoustic Aamping in a Helmholtz Solver}, year = {2017}, doi = {10.2514/1.J055248}, journal = {AIAA Journal}, abstract = { Thermoacoustic Helmholtz solvers provide a cheap and efficient way of predicting combustion instabilities. However, because they rely on the inviscid Euler equations at zero Mach number, they cannot properly describe the regions where aerodynamics may interact with acoustic waves, in the vicinity of dilution holes and injectors, for example. A methodology is presented to incorporate the effect of non-purely acoustic mechanisms into a three-dimensional thermoacoustic Helmholtz solver. The zones where these mechanisms are important are modeled as two-port acoustic elements, and the corresponding matrices, which notably contain the dissipative effects due to acoustic–hydrodynamic interactions, are used as internal boundary conditions in the Helmholtz solver. The rest of the flow domain, where dissipation is negligible, is solved by the classical Helmholtz equation. With this method, the changes in eigenfrequency and eigenmode structure introduced by the acoustic–hydrodynamic effects are captured, while keeping the simplicity and efficiency of the Helmholtz solver. The methodology is successfully applied on an academic configuration, first with a simple diaphragm, then with an industrial swirler, with matrices measured from experiments and large-eddy simulation.}, pdf = {http://cerfacs.fr/wp-content/uploads/2017/03/CFD_AIAAJ_NI_2017.pdf}}

Swingedouw, D., Mignot, J., Ortega, P., Khodri, M., Menegoz, M., Cassou, C. and Hanquiez, V. (2017) Impact of explosive volcanic eruptions on the main climate variability modes, Global and Planetary Change, 150, pp. 24-45, doi:10.1016/j.gloplacha.2017.01.006

[pdf] [doi]

@ARTICLE{AR-CMGC-17-29, author = {Swingedouw, D. and Mignot, J. and Ortega, P. and Khodri, M. and Menegoz, M. and Cassou, C. and Hanquiez, V. }, title = {Impact of explosive volcanic eruptions on the main climate variability modes}, year = {2017}, volume = {150}, pages = {24-45}, doi = {10.1016/j.gloplacha.2017.01.006}, journal = {Global and Planetary Change}, pdf = {http://www.sciencedirect.com/science/article/pii/S0921818116300352}}

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PhD thesis co-funded with ONERA: the spectral difference method on unstructured grids


Context: The CFD team develops and maintains advanced codes for fluid mechanics dedicated to industrial problems. We currently work with ONERA,...Read more

PhD thesis (in collaboration with CNRM/Météo-France): Fire/atmosphere two-way coupling for on-request simulation in case of wildfire hazard


Description: Fire/atmosphere coupled modeling is an active research topic with operational application perspectives for wildfire behavior...Read more