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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

Young PhD day (JDD) – Thursday 8 October 2020

Brigitte Yzel |  24 September 2020

  Ph.D. Students' Day (JDD 2020) Thursday 8 October 2020 Virtual event open to our partners and associates   Planning   The 2020 edition of the PhD Students' Day will take place on October 8th, 2020. This year, this day of the PhD students of the Cerfacs, will take place mainly in visio in order to respect all the health safety measures relating to Covid-19. This day will be held in a virtual way through oral presentations filmed and broadcast on a private link, which we will distribute to all participants. Everyone will thus be able to discover at a distance the subjects developed by the doctoral students. At the same time, the "Posters session" will be opened on the morning of the JDD, by sending all the posters in pdf format by e-mail to all the participants for consultation, and by opening the "50-minute question session" on a channel whose links we will send you. This will allow participants to ask questions about the posters of the session. Finally, we have included in this 5th edition a great novelty, by allowing several students to present their subject in the popularised form of "My thesis in 3 minutes", guided by Matthieu Pouget, actor and theatre director. This day will end with the vote for the "Best poster" and the "Best presentation of My thesis in 3 minutes". Participation in the event is free of charge. However, for logistical reasons, registration, only by invitation, is mandatory.   Organising Committee:  Scientific committee  Nicolas Venkovic Victor Xing Inscription &  information Jade Schweiger Brigitte Yzel  Read more


Sparse Days 2020, Cerfacs

Brigitte Yzel |  24 September 2020

Sparse Days Meeting 2020  23 - 24 November 2020 Virtual Workshop   The annual Sparse Days meeting will be held this year as a virtual event, on 23 - 24 November 2020. Sadly, because of the pandemic, we will not be able to have a normal face-to-face Sparse Days at Cerfacs this year. We will be holding an online version from 3pm to 7pm on 23 and 24 November. The timing is chosen to accommodate participants from North America since, at normal Sparse Days, we have a good representation from there. A registration form  is available on this conference website where you can also submit a title and an abstract for any proposed talk. We will probably be using the Webex system and will post details about how to connect to all people who register.Read more

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RESEARCH PUBLICATIONS

Barret, B., Emili, E. and Le Flochmoën, E. (2020) A tropopause-related climatological a priori profile for IASI-SOFRID ozone retrievals: improvements and validation, Atmospheric Measurement Techniques, 13 (10), pp. 5237–5257, doi:10.5194/amt-13-5237-2020

[pdf] [doi]

@ARTICLE{AR-CMGC-20-119, author = {Barret, B. and Emili, E. and Le Flochmoën, E. }, title = {A tropopause-related climatological a priori profile for IASI-SOFRID ozone retrievals: improvements and validation}, year = {2020}, number = {10}, volume = {13}, pages = {5237–5257}, doi = {10.5194/amt-13-5237-2020}, journal = {Atmospheric Measurement Techniques}, pdf = {https://cerfacs.fr/wp-content/uploads/2020/10/GLOBC-ARTICLE-Emili-amt-13-5237-2020.pdf}}

Jaravel, T., Dounia, O., Malé, Q. and Vermorel, O. (2020) Deflagration to detonation transition in fast flames and tracking with chemical explosive mode analysis, Proceedings of the Combustion Institute, 38

@ARTICLE{AR-CFD-20-121, author = {Jaravel, T. and Dounia, O. and Malé, Q. and Vermorel, O. }, title = {Deflagration to detonation transition in fast flames and tracking with chemical explosive mode analysis}, year = {2020}, volume = {38}, journal = {Proceedings of the Combustion Institute}, abstract = {In the context of vapour cloud explosion, the flame acceleration process can lead to conditions promoting deflagration to detonation transition (DDT), potentially leading to increased damages in accidental scenarios. This study focuses on this phenomenon by performing simulations of detonation reinitiation for fast flames in the Chapman-Jouguet deflagration regime. It is obtained experimentally by the attenuation of an incident detonation by an array of obstacles. A primary objective of the paper is to demonstrate the ability of the numerical model to reproduce the major experimental trends, namely the variation of the reinitiation propensity for different initial pressures and blockage ratios (BRs). Chemical explosive mode analysis (CEMA) is also adapted to the context of this study, in order to identify locally the propagation regime and to provide insights on the reinitiation mechanism. An \textit{a priori} validation of the CEMA methodology is first performed on relevant canonical one-dimensional configurations. Subsequently, ensembles of five realizations are computed at different initial pressures and BRs and compared to experimental data. They are shown to reproduce the major observed trends in terms of detonation reinitiation length with respect to the operating conditions, with significant variability from one realization to another. In addition, the reinitiation mechanism is also found to be consistent with experimental observations and a previous numerical study of the same configuration. The CEMA methodology adapted to this context is able to identify locally the different propagation regimes, and to track the highly reactive zones that coherently couple with transverse pressure perturbations, leading to the formation of a strongly reacting kernel which eventually triggers the detonation reinitiation. }, keywords = {Fast flame, detonation, deflagration to detonation transition, chemical explosive mode analysis}}

Dounia, O., Vermorel, O., Jaravel, T. and Poinsot, T. (2020) Time scale analysis of the homogeneous inhibition/suppression of premixed flames by alkali metals, Proceedings of the Combustion Institute, 38

@ARTICLE{AR-CFD-20-122, author = {Dounia, O. and Vermorel, O. and Jaravel, T. and Poinsot, T. }, title = {Time scale analysis of the homogeneous inhibition/suppression of premixed flames by alkali metals}, year = {2020}, volume = {38}, journal = {Proceedings of the Combustion Institute}, abstract = {A time scale analysis of the homogeneous flame inhibition problem is carried out to identify the main parameters controlling the gas phase chemical interaction of the alkali metal inhibitors with the flame chemistry. First, submodels for the interaction of alkali metals with the flame are analyzed to show that a simplified 2-step inhibition cycle can capture the essential features of this interaction. Second, it is shown that this cycle is auto-catalytic, which explains the high efficiency of alkali metals in inhibiting flames even at low concentrations. Third, the time scales associated to this inhibition cycle are linked to the free flame termination time scale via a non-dimensional parameter characterizing the efficiency of an inhibitor at promoting radical scavenging. It is shown that this parameter accounts for the main trends observed in the literature and can also be used to provide estimates for the chemical flame suppression limit. }, keywords = {homogeneous flame inhibition, alkali metals, laminar flames}}

Koven, C. D., Knox, R. G., Fisher, R. A., Chambers, J. Q., Christoffersen, B. O., Davies, S. J., Detto, M., Dietze, M. C., Faybishenko, B., Holm, J., Huang, M., Kovenock, M., Kueppers, L. M., Lemieux, G., Massoud, E., McDowell, N. G., Muller-Landau, H. C., Needham, J. F., Norby, R. J., Powell, T., Rogers, A., Serbin, S. P., Shuman, J. K., Swann, A. L. S., Varadharajan, C., Walker, A. P., Wright, S. J. and Xu, C. (2020) Benchmarking and parameter sensitivity of physiological and vegetation dynamics using the Functionally Assembled Terrestrial Ecosystem Simulator (FATES) at Barro Colorado Island, Panama, Biogeosciences, 17 (11), pp. 3017-3044, doi:10.5194/bg-17-3017-2020

[pdf] [doi]

@ARTICLE{AR-CMGC-20-96, author = {Koven, C.D. and Knox, R.G. and Fisher, R.A. and Chambers, J.Q. and Christoffersen, B.O. and Davies, S.J. and Detto, M. and Dietze, M.C. and Faybishenko, B. and Holm, J. and Huang, M. and Kovenock, M. and Kueppers, L.M. and Lemieux, G. and Massoud, E. and McDowell, N.G. and Muller-Landau, H.C. and Needham, J.F. and Norby, R.J. and Powell, T. and Rogers, A. and Serbin, S.P. and Shuman, J.K. and Swann, A.L.S. and Varadharajan, C. and Walker, A.P. and Wright, S.J. and Xu, C. }, title = {Benchmarking and parameter sensitivity of physiological and vegetation dynamics using the Functionally Assembled Terrestrial Ecosystem Simulator (FATES) at Barro Colorado Island, Panama}, year = {2020}, number = {11}, volume = {17}, pages = {3017-3044}, doi = {10.5194/bg-17-3017-2020}, journal = {Biogeosciences}, pdf = {https://cerfacs.fr/wp-content/uploads/2020/09/GloC-Article-Fisher-Benchmarking-2020.pdf}}

Vannière, B., Roberts, M., Vidale, P. L., Hodges, K., Demory, M. -E., Caron, L. P., Scoccimarro, E., Terray, L. and Senan, R. (2020) The Moisture Budget of Tropical Cyclones in HighResMIP Models: Large-Scale Environmental Balance and Sensitivity to Horizontal Resolution, Journal of Climate, 33, pp. 8457-8473, doi:10.1175/JCLI-D-19-0999.1

[pdf] [doi]

@ARTICLE{AR-CMGC-20-97, author = {Vannière, B. and Roberts, M. and Vidale, P.L. and Hodges, K. and Demory, M.-E. and Caron, L.P. and Scoccimarro, E. and Terray, L. and Senan, R. }, title = {The Moisture Budget of Tropical Cyclones in HighResMIP Models: Large-Scale Environmental Balance and Sensitivity to Horizontal Resolution}, year = {2020}, volume = {33}, pages = {8457-8473}, doi = {10.1175/JCLI-D-19-0999.1}, journal = {Journal of Climate}, pdf = {https://cerfacs.fr/wp-content/uploads/2020/09/GlobC-Article-Terray-J.-Clim.-2020.pdf}}

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Impact of climate change on clear air turbulence for aviation

 

Context: In the context of the CERFACS / AIRBUS / Météo-France collaboration and the "Climate and...Read more


Simulations of COVID propagation

 

There is no doubt that the COVID epidemy raises major questions for our society. To control...Read more

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