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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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NEWS

Sparse Days Meeting 2018 at Cerfacs, Toulouse

Brigitte Yzel |  12 June 2018

The annual Sparse Days meeting will be held at CERFACS in Toulouse on 27th and 28th September 2018.

Registration for the Sparse Days is free but we ask people who are coming to register as soon as possible although the deadline is August 26th. Please complete...

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New supercomputer opened at Cerfacs

superadmin |  16 May 2018

Since the beginning of May 2018, a new supercomputer named Kraken has been setup to reinforce Cerfacs' simulation capabilities. With a peak performance of 315 Tflop / s this new computer provided by Lenovo is now available to all of Cerfacs' researchers in addition to the Nemo computer. The...Read more

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CALENDAR

No event has been found

Thu

27

Sep

From 27 September 2018 to 28 September 2018

Sparse Days Meeting 2018 at Cerfacs, Toulouse

Sparse Days Meeting 2018 at Cerfacs, Toulouse

Salle JCA, Cerfacs, Toulouse


Mon

08

Oct

From 8 October 2018 to 10 October 2018

Code coupling using OpenPALM

Code coupling using OpenPALM

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RESEARCH PUBLICATIONS

Dounia, O., Vermorel, O. and Poinsot, T. (2018) Theoretical analysis and simulation of methane/air flame inhibition by sodium bicarbonate particles, Combustion and Flame, 193, pp. 313-326, doi:10.1016/j.combustflame.2018.03.033

[pdf] [doi]

@ARTICLE{AR-CFD-18-75, author = {Dounia, O. and Vermorel, O. and Poinsot, T. }, title = {Theoretical analysis and simulation of methane/air flame inhibition by sodium bicarbonate particles}, year = {2018}, volume = {193}, pages = {313-326}, doi = {10.1016/j.combustflame.2018.03.033}, journal = {Combustion and Flame}, abstract = {The capacity of sodium bicarbonate (NaHCO3)s powder to chemically reduce flame speeds and mitigate the effects of accidental explosions is well established. The inhibition of premixed hydrocarbon/air flames by monodispersed (NaHCO3)s solid particles is investigated, here, using theory and numerical simulations. First, an analytical solution for the temperature history of a solid (NaHCO3)s particle crossing a flame shows that the size of the largest (NaHCO3)s particle which can decompose inside the flame front, and act on chemical reactions efficiently, strongly depends on the flame speed. For various fuels and a wide range of equivalence ratios, particles with a strong potential for flame inhibition are identified: hence a criterion, on the maximum particle size, for efficient inhibition is proposed. Thereafter, a one-dimensional methane/air flame traveling in a premixed gas loaded with sodium bicarbonate is simulated using a chemical mechanism based on GRI-Mech, extended to include inhibition chemistry and reduced to 20 species with a DRGEP method. Inhibitor particle size and mass loading are varied to study the flame response to inhibition by (NaHCO3)s powders. Finally, two-dimensional simulations of a planar flame traveling in a flow with a non-uniform inhibitor mass loading distribution are analyzed. In the case of strong particle stratication, an acceleration of the flame is observed, instead of a mitigation. This fundamental mechanism may limit the actual potential of inhibition powders in real configurations.}, keywords = {DT, detonation, flame acceleration}, pdf = {https://cerfacs.fr/wp-content/uploads/2018/06/CFD_DOUNIA_COMBandFJUIN2018.pdf}}

Lehner, F., Deser, C., Simpson, I. R. and Terray, L. (2018) Attributing the U.S. Southwest's Recent Shift Into Drier Conditions, Geophysical Research Letters, 45 (12), pp. 6251-6261, doi:10.1029/2018GL078312

[pdf] [Supplementary Material] [doi]

@ARTICLE{AR-CMGC-18-88, author = {Lehner, F. and Deser, C. and Simpson, I.R. and Terray, L. }, title = {Attributing the U.S. Southwest's Recent Shift Into Drier Conditions}, year = {2018}, number = {12}, volume = {45}, pages = {6251-6261}, doi = {10.1029/2018GL078312}, journal = {Geophysical Research Letters}, pdf = {https://cerfacs.fr/wp-content/uploads/2018/07/GLOBC-Article-terray-Attributing-the-U.S.-Southwests-Recent-Shift-Into-Drier-Conditions-2018.pdf}, supplementaryMaterial = {https://cerfacs.fr/wp-content/uploads/2018/07/ARTICLE-GLOBC-TERRAY-JUILLET-SI.pdf}}

Barthélémy, S., Ricci, S., Morel, T., Goutal, N., Le Pape, E. and Zaoui, F. (2018) On operational flood forecasting system involving 1D/2D coupled hydraulic model and data assimilation, Journal of Hydrology, 562, pp. 623-634, doi:10.1016/j.jhydrol.2018.05.007

[pdf] [doi]

@ARTICLE{AR-CMGC-18-69, author = {Barthélémy, S. and Ricci, S. and Morel, T. and Goutal, N. and Le Pape, E. and Zaoui, F. }, title = {On operational flood forecasting system involving 1D/2D coupled hydraulic model and data assimilation}, year = {2018}, volume = {562}, pages = {623-634}, doi = {10.1016/j.jhydrol.2018.05.007}, journal = {Journal of Hydrology}, pdf = {https://cerfacs.fr/wp-content/uploads/2018/06/GLOBC-Article-Barthelemy_CouplageAdour_JoH_2018.pdf}}

Bushuk, M., Msadek, R., Winton, M., Vecchi, G., Yang, X., Rosati, A. and Gudgel, R. (2018) Regional Arctic sea-ice prediction : Potential versus operational seasonal forecast skill, Climate Dynamics, pp. 1-23, doi:10.1007/s00382-018-4288-y

[pdf] [doi]

@ARTICLE{AR-CMGC-18-76, author = {Bushuk, M. and Msadek, R. and Winton, M. and Vecchi, G. and Yang, X. and Rosati, A. and Gudgel, R. }, title = {Regional Arctic sea-ice prediction : Potential versus operational seasonal forecast skill}, year = {2018}, pages = {1-23}, doi = {10.1007/s00382-018-4288-y}, journal = {Climate Dynamics}, pdf = {https://cerfacs.fr/wp-content/uploads/2018/06/GLOBC-Article-Buskuk_ClimDyn_-JUIN2018.pdf}}

Odier, N., Balarac, G. and Corre, C. (2018) Numerical analysis of the flapping mechanism for a two-phase coaxial jet, International Journal of Multiphase Flow, 106 (september), pp. 164–178, doi:10.1016/j.ijmultiphaseflow.2018.05.028

[url] [doi]

@ARTICLE{AR-CFD-18-81, author = {Odier, N. and Balarac, G. and Corre, C }, title = {Numerical analysis of the flapping mechanism for a two-phase coaxial jet}, year = {2018}, number = {september}, volume = {106}, pages = {164–178}, doi = {10.1016/j.ijmultiphaseflow.2018.05.028}, journal = {International Journal of Multiphase Flow}, abstract = {A numerical study of a coaxial liquid jet sheared by an annular high-speed stream is performed at moderate density and velocity ratio between phases. The destabilization mechanism of the jet is studied : due to the shear induced by the high-speed stream, annular interfacial waves are generated near the jet injection, which subsequently connect and yield a sinuous organization for the whole jet, leading to a global flapping phenomenon. The influence of the high-speed stream boundary layer thickness on this flapping is investigated, as well as the influence of the velocity and the momentum flux ratio between phases. It appears that it is not sufficient to consider only the momentum flux ratio between phases to characterize the flapping dynamics or the steps of the atomization process. On the other hand, the Reynolds and Weber numbers based on the high-speed stream properties display a strong influence on these phenomena.}, keywords = {Coaxial jet; Two-phase flow; Flapping dynamics; Parametric study}, url = {https://www.journals.elsevier.com/international-journal-of-multiphase-flow}}

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JOBS OFFERS

Ingénieur développement logiciel de Calcul Haute Performance

 

Contexte Le Cerfacs développe des outils et des méthodes pour résoudre par simulation numérique des problèmes scientifiques de grande taille...Read more


PhD position: High Performance Linear Solver for ThermoHydro-Mechanics with Regularization

 

Context We are interested in the modeling of thermo-hydro-mechanical problems (THM), which describe the behavior of...

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