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11 positions
3 thesis
32 training periods

Last 38 articles accepted for publication

Can oceanic reanalyses be used to assess recent anthropogenic changes and low-frequency internal variability of upper ocean temperature ?,
L. Corre, L. Terray, M. Balmaseda, A. Ribes, A. Weaver

Climate Dynamics, 38:877-896, DOI 10.1007/s00382-010-0950-8

On computing inverse entries of a sparse matrix in and out-of-core environment,
P.R. Amestoy, I.S. Duff,J.-Y. L'Excellent, Y. Robert, F.-H. Rouet, and B. Ucar

SIAM J. Sci. Comput., 34(4): A1975-A1999, 2012

The dynamical link between surface cyclones, upper-trospheric Rossby wave breaking and the life cycle of the Scandinavian blocking,
C. Michel, G. Rivière, L. Terray, B. Joly

Geophys. Res. Lett., 39, L10806, doi:10.1029/21012GL051682, 2012

A compressible wall model for Large-Eddy Simulation with application to prediction of aerothermal quantities,
S. Bocquet, P. Sagaut, and J.-C. Jouhaud.

Physics of Fluids, 24(June): 065103, 2012

Linear regression models, least-squares problems, normal equations, and stopping criteria for the conjugate gradient method,
M. Arioli and S. Gratton

Computer Physics Communications, 183(1):2322-2336, 2012

Evidence for multiple drivers of North Atlantic multi-decanal climate variability,
L. Terray

Geophys. Res. Lett., 39, L19712, doi:10.1029/21012GL053046, 2012

Disturbance energy transport and sound production in gaseous combustion,
M.J. Brear, F. Nicoud, T. Mohsen, A. Giauque, and E. Hawkes

Journal of Fluid Mechanics, 707(September): 53 - 73, 2012

Source point discovery through high frequency asymptotic time reversal,
J.-D. Benamou, F. Collino and S. Marmorat

Journal of Computational Physics, 231:4643-4661, 2012

Mechanisms for European summer temperature response to solar forcing over the last millenium,
D. Swingedouw, L. Terray, J. Servonnat, J. Guiot

Climate of the Past., 8, doi : 10.5194/cp-B-1487-2012

Effects of free-stream turbulence on high pressure turbine blade heat transfer predicted by structured and unstructured LES,
E. Collado, N. Gourdain, F. Duchaine, and L.Y.M. Gicquel

International Journal of Heat and Mass Transfer. 55(21-22):5754-5768, 2012

Near-surface salinity as Nature's rain gauge to detect human influence on the tropical cycle,

L. Terray, L. Corre, S. Cravatte, T. Delcroix, G. Reverdin, A. Ribes

Journal of Climate, 25, 958-977

Modal decomposition for the analysis of the rotor-stator interactions in multistage compressors. Journal of Thermal Science,
C. Courtiade, N. Ottavy, and N. Gourdain

Journal of Thermal Science, 21(3):276-285, 2012

Source point discovery through high frequency asymptotic time reversal,
A. Bendali, F. Colino, M.B. Fares, and B. Steif

IEEE Transactions on Antennas and Propagation, 60:4732-4744, 2012

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers,
L.Y.M. Gicquel, G. Staffelbach, and T. Poinsot

Progress in Energy and Combustion Science, 38:782-817, 2012

Regional-Scale Simulations of Widland Fire Spread Informed by Real-Time Flame Front Observations,
M.C. Rouchoux, B. Delmotte, B. Cuenot, S. Ricci, A. Trouvé

Proc. of the Combustion Institute, 34, 2012

Comparison of RANS simulation and LES for prediction of wall heat transfer in a highly loaded turbine vane,
N. Gourdain, L.Y.M. Gicquel and E. Collado

Journal of Propulsion and Power, 28(2): 423-433, 2012

Impact of a time-dependent background error covariance matrix on air quality analysis,

E. Jaumouillé, S. Massart, A. Piacentini, D. Cariolle, and V.H. Peuch

Geoscientific model development

http://www.geosci-model-dev.net/5/1075/2012/gmd-5-1075-2012.html

LES investigation of the flow through an effusion-cooled aeronautical combustor model,
E. Motheau, T. Lederlin, J. Florenciano, and P. Bruel

Flow, Turbulence and Combustion, 88 (March): 169-189, 2012

Matched asymptotic expansions of the eigenvalues of a 3-D boundary-value problem relative to two cavities linked by a hole of small size,
A. Bendali, M.B. Fares, A. Tizaoui, and S. Tordeux

Communications in Computational Physics, 11(2):456-471, 2012

Using boundary condition to account for mean flow effects in a zero mach number acoustic solver,
E. Motheau, F. Nicoud, and T. Poinsot

Journal of Engineering for Gas Turbines and Power, 134:111502 (8pp.), 2012

Time-harmonic acoustic scattering in a complex flow: a full coupling between acoustics and hydrodynamics,
A.S. Bonnet-Ben Dhia, J.F. Mercier, F. Millot, S. Pernet, and E. Peynaud

Communications in Computational Physics, 11(2):555-572, 2012

Parallel computation for the radiative heat transfer using the DOM in combustion applications: direction, frequency, sub-domain decompositions and hybrid methods,
D. Poitou, J. Amaya, and F. Duchaine

Numerical Heat Transfer, Part B Fundamentals, 62-1, 2012

Modeling the climate impact of road transport, maritime shipping and aviation over the period 1860–2100 with an AOGCM
D. J. L. Olivié, D. Cariolle, H. Teyssèdre, D. Salas, A. Voldoire, H. Clark, D. Saint-Martin, M. Michou, F. Karcher, Y. Balkanski, M. Gauss, O. Dessens, B. Koffi, and R. Sausen

Atmospheric Chemistry and Physics, 2012, Vol.12, pp. 1449-1480
SRef-ID: 1680-7324/acp/2012-12-1449

http://www.atmos-chem-phys.net/12/1449/2012/acp-12-1449-2012.html

Time-domain harmonic balance method for aerodynamics and aeroelastic simulations of turbomachinery flows,
F. Sicot, T. Guedeney, and G. Dufour

Internal Journal of Computational Fluid Dynamics, page doi:10.1080/10618562.2012.740021, 2012

Transmission eigenvalues for inhomogeneous media containing obstacles,
F. Cakoni, A. Cossonniere, and H. Haddar

Inverse Problems and Imaging, 6(3):373-398, 2012

Acoustic and Large Eddy Simulation studies of azimutal modes in annular combustion chambers,
P. Wolf, G. Staffelbach, L.Y.M. Gicquel, J.-D. Mueller, and T. Poinsot

Combustion and Flame, 159 (November): 3398-3413, 2012

Effects of radiative heat transfer on the structure of turbulent supersonic channel flow,
S. Ghosh, R. Friedrich, M. Pfitzner, CHR. Stemmer, B. Cuenot and M. El Hafi

Journal Fluid Mechanics, Vol. 677, pp. 417-444, 2011

On the Relative Impact of Subgrid-Scale Modelling and Conjugate Heat Transfer in LES of Hot Jets in Cross-Flow over Cold Plates,
Y. Hallez, J-C Jouhaud, T. Poinsot

International Journal for Numerical Methods in Fluids, Vol. 67, Issue 10, pp. 1321-1340, December 2011

Flexible variants of block restarted GMRES methods with application to geophysics,
H. Calandra, S. Gratton, J. Langou, X. Pinel and X. Vasseur

SIAM J. Sci. Computing, 34(2):A714-A736, 2012

Validation of Numerical Prediction of Dynamic Derivatives: Two Test Cases,
B. Mialon, A. Khrabrov, A. Da Ronch, K. Badcock, L. Cavagna, P. Eliasson, M. Zhang, S. Ricci, A. Huebner, S. Ben Khelil, J-C Jouhaud, G. Rogé, S. Hitzel, M. Lahuta,

Progress in Aerospace Sciences, Vol 47, N. 8, pp. 674-694, 2011.

Large-Eddy Simulation of combustion instabilities in a lean partially premixed swirled flame,
B. Franzelli, E. Riber, L. Giquel and T. Poinsot,

Combustion and flames, 159, 2, 621-637, 2012.

Design, implementation, and analysis of maximum transversal algorithms,
I.S. Duff, K. Kaya, and B. Ucar

ACM Trans. Math. Softw., 38(2):13:1-13:31, 2012

Sensitivity analysis of transfer functions of laminar flames,

F. Duchaine, F. Boudy, D. Durox and T. Poinsot

Combustion and flames, 158, 2384-2394, 2011.

On the accuracy of the Karlson-Walden estimate of the backward error for linear least squares problems,

S. Gratton, P. Jiranek and D. Titley-Peloquin

SIAM Journal on Matrix Analysis and Applications, 33(3):822-836, 2012

Using approximate secant equations in limited memory methods formultilevel unconstrained optimization,
S. Gratton, V. Malmedy, and P. L. Toint

Computational Optimization and Applications, 51:967-979, 2012

Discretization orders for distance geometry problems,
C. Lavor, J. Lee, A. Lee-St John, L. Liberti, A. Mucherino, and M. Sviridenko

Optimization Letters, 6:783-796, 2012

The discretizable molecular distance geometry problem,
C. Lavor, L. Liberti, N. Maculan, and A. Mucherino

Computational Optimization and Applications, 52:115-146, 2012

Constrained regional recovery of continetal water mass time-variations from GRACE-based geopotential anomalies,
G.L. Ramilien, L. Seoane, F. Frappart, R. Biancale, S. Gratton, X. Vasseur and S. Bourgogne

Computational Optimization and Applications, 52:115-146, 2012

All CERFACS reports

CERFACS in media.

The event you cannot afford to miss: MUSAF II, the return !

The MUSAF II Colloquium will be organized on 18-20 September 2013 by CERFACS at CIC (International Conference Centre) Météo-France, Toulouse.

The first objective of this colloquium is to present and discuss state-of-the-art concerning numerical methods and coupling techniques for multidisciplinary simulations, within the framework of aeronautical flows: full aircraft computations, rotorcraft, turbomachinery flows, reacting flows, thermo-acoustics, noise, heat transfer or aeroelastic predictions.

The second objective is to present new formulations and solutions of real-life MDO (Multi-Disciplinary Optimization) and control problems.

The MUSAF II project is supported by the European project COPA-GT, leading aeronautical manufacturers (AIRBUS Operations S.A.S. and SAFRAN), STAE Toulouse and research groups, which are all interested in developing new effective approaches for aeronautical design.

Online registration : www.cerfacs.fr/musaf/

Two new INCITE projects for CERFACS' teams through the 2013 INCITE award

First INCITE project to study contrail cirrus physics for AE team and Laboratoire d'Aérologie

The AE team and the Laboratoire d’Aérologie have been awarded 25 millions core hours through the 2013 INCITE award to study contrail cirrus physics, an important component of the environmental impact of aviation. The LES solver Méso-NH will be evaluated for the same atmospheric conditions as those obtained from a dedicated flight campaign, and output will be used to derive parameterizations of optical and radiative properties of contrails.

Second INCITE project on explosions in building for CFD team

A new program proposed by the CFD team of CERFACS has been accepted: the topic of this work will be the simulation of explosions in buildings. This important safety problem will be simulated with LES (AVBP code) on the Argonne machines. It is the second INCITE project accepted for the CFD team in four years. In 2012, only 4 non US teams (among 60 successful projects) have been accepted in INCITE. Two of them will come from CERFACS.

Recent Advances on Optimization, July 24-26, 2013

An international conference on optimization will be organized under the umbrella of a research programme supported by the RTRA STAE fundation in Toulouse on July 24-26th 2013. The conference will address topics in unconstrained and constrained optimization, with and without derivatives. It will be also the occasion to celebrate the many contributions made by Philippe L. Toint to the field. A half-day session related to the data assimilation ADTAO project (Algorithmes de nouvelle génération pour l’assimilation de Données dans le système Terre Atmosphère Océan) will be organized.

http://www.fondation-stae.net/fr/optimization-july2013.html

SPRUCE PRACE Project : Seasonal forecast at high resolution on Curie

23 Million hours have been jointly awarded to CERFACS' Global Change team and EAC (Météo-France). PRACE allocated this resources on TGCC Curie BULL supercomputer from november 2012 to october 2013.

SPRUCE's purpose is to attempt to improve our capacity to predict climate variations six month ahead, by combining our best present tools and data with a high performance computation capacity which is not yet available in our production machines but is offered by PRACE Tier0 platforms.

CERFACS/CFD combustion team is involved in two PRACE projects in 2013

The X-VAMPA project is dedicated to the cross validation and assessment of
numerical methodologies for the modeling of primary atomization of liquid jets. Atomizers are widely used in automotive and aircraft engines because of the efficiency of liquid fuel sprays, but their complex physics raise still open questions. The objective of the project is to make progress in the understanding of atomization processes by means of detailed simulation. Partners are CORIA, CERFACS and LEGI.

The SIMAC project aims at performing large eddy simulation of ignition in a multiple-injectors annular combustor. This topic is of fundamental interest for combustion science and has important practical applications for the design of innovative industrial gas turbines and aero-engines, in which ignition is a critical phase. For the first time, full burner ignition simulations will be perfectly validated by quantitative comparison with measurements from ignition tests in a transparent walls combustor (MICCA), which provides a detailed and unique view of the ignition process. Partners are EM2C and CERFACS.

CERFACS increases its internal computing power

CERFACS has just installed during summer 2012 a new high-performance computing resource from BULL. Now constisting of 2 016 Intel Sandy Bridge cores on 126 nodes this new server has peak performance of 42 Tflop/s. Its non-blocking Infiniband network and its GPFS (Global Parallel FileSystem) data infrastructure insure the good scalability of parallel applications.

In addition of CERFACS' indoors HP (96 AMD ManyCours nodes) and IBM (82 Intel Nehalem nodes) servers the researchers will use this new computational resource to run Navier-Stokes type simulations (aerodynamics, aero-acousic, combustion, climate modeling, ...) with increased resolutions in time and space, combined with more realistic physical models.

European Research Council "advanced grant" on combustion instabilities won by IMFT and CERFACS : INTECODIS (Introducing Exascale Computing in Combustion Instabilities Simulations)

The PSC team of Institut de Mécanique des Fluides de Toulouse (CNRS/INPT/UPS) and the CFD team of CERFACS have won an ERC (European Research Council) grant in the field of combustion instabilities.

This 2.56 Meuros grant will start in February 2013, last five years and support up to 10 researchers at IMFT and CERFACS in the field of massively parallel simulations for combustion instabilities.

It is one of the first ERC advanced grants in Toulouse in the field of engineering and it is a great pleasure for IMFT and CERFACS researchers to bring such a prize to the Toulouse community. The Principal Investigator of INTECOCIS is Dr Thierry Poinsot (CNRS). He will be assisted by Dr Laurent Selle (CNRS) and Dr Laurent Gicquel (CERFACS).

Second workshop of COPA-GT in Barcelona

The second workshop of the COPA-GT project will take place in Barcelona Supercomputing Center (BSC) from 7th to 11th January, 2013. The first day will be dedicated to the project meeting and presentations. The rest of the week will comprise of training in parallel programming and post-processing of data.
For more information and details on the workshop's program:

http://copagt.cerfacs.fr/events.html

A new ERP in deployment

A new ERP (Enterprise Resource Planning) deployment is in the process of being setup at CERFACS financed in part by the FSE (Fond Social Européen).

SAFRAN launches HAIDA program

On september 27, 2012, SAFRAN launched Haida, a new dedicated research program aimed at boosting the pace of R&D in aerodynamics and aerothermodynamics by networking resources with external research partners.

More information

International Symposium on Combustion

T. Poinsot program chair for the 35th Symposium (International) on Combustion in San Francisco, 2014 : The two program chairs for the 35th Symposium (International) on Combustion have been announced at the 34th Symp in Warsaw : Dr T. Poinsot (IMFT and CERFACS) and Pr S. Chung (KAUST) will organize the scientific program of the 35th Symp. Which will take place in San Francisco in August 2014. This bi annual meeting is the most prestigious meeting in combustion : its proceedings are the only one to be referenced as journal papers by ISI, the acceptance rate of papers is less than 40 % and typically 1200 combustion experts participate from all over the world. This is the fourth time a french scientist organizes this meeting after Pr Candel, Dagaut and Dr Battin Leclerc since the symposium started 55 years ago.

CERFACS initiates a training programme for computer science

In 2011, CERFACS initiates a training programme for computer science targeting students, PHDs, engineers and researchers, in academy and applied research. The training sessions are taught by CERFACS researchers and engineers. Pratical training sessions dedicated to codes developed or co-developed by CERFACS(AVBP, OpenPALM,DSCLIM, CESC, OASIS) are part of the programme. The detailed programme and all information are available on the CERFACS website: www.cerfacs.fr/training/

CERFACS has performed a very large ensemble of climate simulations to study decadal climate predicability

The CERFACS/CNRS Climate Modelling and Global Change Team has recently achieved a very large ensemble of decadal hindcasts and forecasts simulations in the framework of the Coupled Model Intercomparison Project version 5 (CMIP5) exercise which will provide the modelling results for the next Intergovernmental Panel on Climate Change (IPCC) assessment report planned in 2013. The climate model is the CNRM-CM5 model developed jointly with the Centre National de Recherches Météorologiques (CNRM). More than 5000 years of simulated climate have been performed requiring 200 000 CPU hours on the Météo-France NEC supercomputer. Post-processing and analysis of the 120 Terabytes generated is on going. The main scientific objective is to investigate the possibility of climate predictability at decadal time scales and the relevant physical mechanisms.

Scientific awards

November 2012 : Anke Troeltzsch has been awarded the prize of University Paul Sabatier in Mathematics and Computer science of "Académie des Sciences Inscriptions et Belles Lettres de Toulouse" for her thesis on "An active-set trust-region method for bound-constrained nonlinear optimization without derivatives applied to noisy aerodynamic design problems" defended in June 2011 and supervised by Serge Gratton and Philippe Toint (University of Namur, Belgium).

This work has been realized in the framework of the collaboration between Airbus and CERFACS on shape optimization in aerodynamics.

November 2012 : Elena Collado Morata has been awarded the prize Léopold Escande of Institut National Polytechnique of Toulouse for her these dealing with improving performance of axial turbines from helicoper engines (2012), supervised by L. Gicquel.