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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

Hydrology prize for Gildas DAYON

thual |  12 January 2017

Gildas Dayon was awarded the 2016 Henri Milon prize (hydrology) by the Société Hydrotechnique de France for his Ph.D thesis entitled "Evolution of the continental hydrological cycle over France during the coming decades" . This work has been done at the CECI CERFACS-CNRS joint research unit, and...Read more


Best 2016 ASME paper in combustion for an AVBP study at IMFT

superadmin |  4 January 2017

Dr Christian KRAUS (IMF Toulouse) ASME 2016 paper was chosen as one of the Best Papers by the Combustion, Fuels & Emissions Committee after the 2016 Turbo Expo in Seoul, South Korea: GT2016-56368 - Influence of Heat Transfer and Material Temperature on Combustion Instabilities in a Swirl...Read more

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RESEARCH PUBLICATIONS

Balaji, V., Maisonnave, E., Zadeh, E., Lawrence, B. N., Biercamp, J., Fladrich, U., Aloisio, G., Benson, R., Caubel, A., Durachta, J., Foujols, M. -A., Lister, G., Mocavero, S., Underwood, S. and Wright, G. (2017) CPMIP : Measurements of Real Computational Performance of Earth System Models in CMIP6, Geoscientific Model Development, 46, pp. 19-34, doi:10.5194/gmd-10-19-2017

[doi]

@ARTICLE{AR-CMGC-17-2, author = {Balaji, V. and Maisonnave, E. and Zadeh, E and Lawrence, B.N. and Biercamp, J. and Fladrich, U. and Aloisio, G. and Benson, R. and Caubel, A. and Durachta, J. and Foujols, M.-A. and Lister, G. and Mocavero, S. and Underwood, S. and Wright, G. }, title = {CPMIP : Measurements of Real Computational Performance of Earth System Models in CMIP6}, year = {2017}, volume = {46}, pages = {19-34}, doi = {10.5194/gmd-10-19-2017}, journal = {Geoscientific Model Development}}

Bidadi, S., Perez-Arroyo, C., Puigt, G. and Boussuge, J. -F. (2016) A high-order adaptive finite volume methodology for shock- turbulence interaction, Journal of Computational Physics

@ARTICLE{AR-CFD-16-141, author = {Bidadi, S. and Perez-Arroyo, C. and Puigt, G. and Boussuge, J.-F. }, title = {A high-order adaptive finite volume methodology for shock- turbulence interaction}, year = {2016}, journal = {Journal of Computational Physics}, abstract = {In the current study, a computationally efficient fully finite volume methodology for aeroacoustics of high-speed turbulent flows is proposed. The formulation consists of two main components: (1) the finite volume extension of a sixth-order finite difference compact scheme in conjunction with an eighth-order compact filter to remove grid-to-grid oscillations in smooth regions, and (2) a new adaptive nonlinear filtering technique to capture sharp discontinuities in the flow. The sensors of Bogey and Ducros are employed to control the dissipation of the nonlinear filter. Within the shock/dissipation region, the second-order minmod and fifth-order Monotonicity Preserving Approach (MPA) reconstruction algorithms are used to provide the required dissipation. For the minmod case, it is demonstrated that turbulent eddies passing through the shock zone are exposed to excess dissipation when the number of points per wavelength of the oncoming perturbation is approximately four times the size of the dissipation zone width. In order to mitigate the excess dissipation of the minmod filter, an alternate technique of controlling the velocity jump instead of the numerical viscosity of the nonlinear filter is suggested. The dispersion and dissipative properties of the methodology are analysed by employing the approximate dispersion relation (ADR). Then the dispersion-dissipation condition of Hu et al. is used to optimize the spectral behavior of the nonlinear filter. The new methodology together with the two versions of the minmod filter and the MPA filter are examined for several benchmark problems. The results for the modified-minmod and MPA filters show good agreement with the reference solutions. Moreover, the extra CPU cost due to the shock filtering technique is limited, and is shown to be lower than the ones estimated in previous studies. }, keywords = {elsA, Finite volume, Shock-capturing, Shock filter, Spatial filter, Compact scheme, Shock sensor, Computational aeroacoustics}}

Urbano, A., Douasbin, Q., Selle, L., Staffelbach, G., Cuenot, B., Schmitt, T., Ducruix, S. and Candel, S. (2016) Study of flame response from the Large-Eddy Simulation of a 42-injector rocket engine, Proceedings of the Combustion Institute, 36, doi:10.1016/j.proci.2016.06.042

[doi]

@ARTICLE{AR-CFD-16-192, author = {Urbano, A. and Douasbin, Q. and Selle, L. and Staffelbach, G. and Cuenot, B. and Schmitt, T. and Ducruix, S. and Candel, S. }, title = {Study of flame response from the Large-Eddy Simulation of a 42-injector rocket engine}, year = {2016}, volume = {36}, doi = {10.1016/j.proci.2016.06.042}, journal = {Proceedings of the Combustion Institute}}

Felden, A., Riber, E. and Cuenot, B. (2016) Effect of the chemistry description on LES of a realistic swirled non-premixed combustor, Proceedings of the Combustion Institute, 36

@ARTICLE{AR-CFD-16-170, author = {Felden, A. and Riber, E. and Cuenot, B. }, title = {Effect of the chemistry description on LES of a realistic swirled non-premixed combustor}, year = {2016}, volume = {36}, journal = {Proceedings of the Combustion Institute}}

Emery, C., Biancamaria, S., Boone, A., Garambois, P. -A., Ricci, S., Rochoux, M. and Decharme, B. (2016) Temporal Variance-Based Sensitivity Analysis of the River-Routing Component of the Large-Scale Hydrological Model ISBA-TRIP: Application on the Amazon Basin, Journal of Hydrometeorology, 17 (12), pp. 3007-3027, doi:10.1175/JHM-D-16-0050.1

[url] [doi]

@ARTICLE{AR-CMGC-16-305, author = {Emery, C. and Biancamaria, S. and Boone, A. and Garambois, P.-A. and Ricci, S. and Rochoux, M. and Decharme, B. }, title = {Temporal Variance-Based Sensitivity Analysis of the River-Routing Component of the Large-Scale Hydrological Model ISBA-TRIP: Application on the Amazon Basin}, year = {2016}, number = {12}, volume = {17}, pages = {3007-3027}, doi = {10.1175/JHM-D-16-0050.1}, journal = {Journal of Hydrometeorology}, abstract = {The continental part of the water cycle is commonly represented with hydrological models. Yet, there are limits in their capacity to accurately estimate water storage and dynamics because of their coarse spatial resolution, simplified physics, and an incomplete knowledge of atmospheric forcing and input parameters. These errors can be diminished using data assimilation techniques. The model’s most sensitive parameters should be identified beforehand. The objective of the present study is to highlight key parameters impacting the river-routing scheme Total Runoff Integrating Pathways (TRIP) while simulating river water height and discharge as a function of time focusing on the annual cycle. Thus, a sensitivity analysis based on the decomposition of model output variance (using a method called ANOVA) is utilized and applied over the Amazon basin. Tested parameters are perturbed with correcting factors. First, parameter-correcting coefficients are considered uniform over the entire basin. The results are specific to the TRIP model and show that geomorphological parameters explain around 95\% of the water height variance with purely additive contributions, all year long, with a dominating impact of the river Manning coefficient (40\%), the riverbed slope (35\%), and the river width (20\%). The results also show that discharge is essentially sensitive to the groundwater time constant that makes up more than 90\% of the variance. To a lesser extent, in rising/falling flow period, the discharge is also sensitive to geomorphological parameters. Next, the Amazon basin is divided into nine subregions and the sensitivity analysis is carried out for regionalized parameter-correcting coefficients. The results show that local-region parameters impact water height, while upstream-region parameters affect discharge. }, url = {http://dx.doi.org/10.1175/JHM-D-16-0050.1}}

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JOBS OFFERS

PhD with SAFRAN: LES methods for two phase reacting flows in moving geometries. Application to Constant Volume Combustion chambers

 

CERFACS is looking for a PhD student to contribute to the development of LES (Large Eddy Simulation) for two phase flows in moving  geometries. The...Read more


TILDA project: hp-adaptation of the spectral difference method with application in aeroacoustics

 

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

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