Cerfacs Enter the world of high performance ...

PhD Algo-Coop


  • Ph. LELEUX: Hybrid direct and iterative solvers for sparse indefinite and overdetermined systems on future exascale architectures. PhD Thesis. Cotutelle France-Germany. Wednesday 3 Fébruary 2021. INPT. EDMITT.
    •  Jury: F. Nataf, A. Frommer, A. Ramage, H. Köstler, H. Fassbender, U. Ruede, M. Dayde, D. Ruiz, I.S. Duff, M. Bolten





  • J. B. LATRE: Hypercomplex algebras for Computation. PhD Thesis. Université de Toulouse – Ecole Doctorale : MITT. 18 February 2019.
    • Jury: F. Chatelin, M. Arioli, S. Petiton, B. Alziarychassat, Ph. Ricoux




























  • M. AhmadnasabHomotopic Deviation theory: A qualitative study. Ph.D. dissertation, Université Toulouse 1, October 2007.
    • Jury: J. Fleckinger, M. B. van Gijzen, S. Gaubert, F. Chaitin-Chatelin, I.S. Duff, J. Giacomoni, E. Traviesas-Cassan, J.-C. Yakoubsohn









  • C. Vömel: Contributions to research in high performance scientific computing for sparse matrices. Ph.D. dissertation, INPT, March 2003. TH/PA/03/26
    • Keywords: High performance computing, sparse linear systems, MUMPS, multifrontal Gaussian elimination, distributed memory code, dynamic task scheduling, sparse data structures, programming standard, Sparse BLAS, reference implementation, matrix norm, condition number, incremental estimators
    • Jury: E. Ng, J. Roman, P. Amestoy, M. Arioli, I. S. Duff, and A. Pothen


  • J. Langou: Iterative methods for solving linear systems with multiple right hand sides. Ph.D. dissertation, INSA Toulouse, June 2003. TH/PA/03/24
    • Keywords: linear systems, Krylov methods, GMRES, multiple right-hand sides, Gram-Schmidt orthogonalization, modern scientific software, parallel distributed computers, scientific computing, large scale numerical simulation in electromagnetism
    • Jury: G. Alléon, A. Bjorck, I.S. Duff, L. Giraud, G. Meurant, C.C. Paige, and Y. Saad






  • D. Orban: Méthodes de points intérieurs pour l’optimisation non-linéaire. Ph.D. Thesis, FUNDP/INPT, May 2001. TH/PA/01/09
    • Keywords: Smooth nonlinear optimization, interior-point methods, speed of convergence, degenerate problems, testing environment
    • Jury: Ph. L. Toint, M. Daydé, A. Sartenaer, I. S. Duff, J. Noailles, S. J. Wright, and J. Henrard



  • A. N. Zaoui: Deux Contributions au Calcul Scientifique I-Sur la convergence de la méthode des Itérations Simultanées couplée à l’algorithme d’Arnoldi itératif II-Autour du Calcul Hypercomplexe. Ph.D. dissertation, Université Toulouse I, December 2000. TH/PA/00/78


  • A. Bouras: Contrôle de convergence des solveurs emboités pour le calcul de valeurs propres avec inversion. Ph.D. dissertation, Université Toulouse I, Septembre 2000. TH/PA/00/77
    • Jury: J. Flckinger, M. Ahuès (rapporteur), P. Spitéri (rapporteur), F. Chaitin-Chatelin, and R. Beauwens ans J.-C. Bergès


  • E. Traviesas: Sur le déploiement du champ spectral d’une matrice. Ph.D. dissertation, Université Toulouse I, May 2000. TH/PA/00/30
    • Keywords: Normwise and Homotopic perturbations, backward error and pseudospectrum, Arnoldi and GMRES methods, eigenvalue problem and linear system
    • Jury: J. Fléckinger, P. Charrier (rapporteur), F. Dias D’almeida (rapporteur), F. Chaitin-Chatelin, I. S. Duff, A. Ilahi, and B. N. Parlett



  • A. Ilahi: Validation du calcul sur ordinateur: application de la théorie des singularités algébriques. Ph.D. dissertation, Université Toulouse I, June 1998. TH/PA/98/31
  • S. Gratton: Outils théoriques d’analyse du calcul à précision finie. Ph.D. dissertation, Institut National Polytechnique de Toulouse, June 1998. TH/PA/98/30
  • A. Harrabi: Pseudospectres d’opérateurs intégraux et différentiels. Application à la Physique mathématique. Ph.D. dissertation, Université Toulouse I, May 1998. TH/PA/98/29





  • V. Toumazou: Portraits spectraux de matrices : un outil d’analyse de la stabilité. PhD thesis, Université Henri Poincaré, Nancy I, 1996. TH/PA/96/46
    • Jury: M. Lalanne, F. Chaitin-Chatelin (rapporteur), B. Philippe (rapporteur), J.-C. Dunyach, V. Frayssé, N. Higham, and M. Gueury





  • T. Braconnier: Sur le calcul de valeurs propres en précision finie. Ph. D. dissertation, Université R. Poincaré, Nancy I, May 1994. TH/PA/94/24



  • C. Puglisi: QR factorization of large sparse overdetermined and square matrices using the multifrontal method in a multiprocessor environment. PhD thesis, CERFACS, Toulouse, France, 1993. TH/PA/93/33
    • Jury: M. Arioli, ø A. Bjorck, M.J. Daydé, I.S. Duff, J. Noailles, and B. Philippe


  • S. Godet-Thobie: Valeurs propres de matrices fortement non normales en grande dimension. PhD thesis, CERFACS, Toulouse, France, 1993. TH/PA/93/06



  • V. Frayssé: Sur la fiabilité des calculs sur ordinateur. PhD thesis, CERFACS, Toulouse, France, 1992. TH/PA/92/11
  • D. Ruiz: Solution of large sparse unsymmetric linear systems with a block iterative method in a multiprocessor environment. PhD thesis, CERFACS, Toulouse, France, 1992. TH/PA/92/06



  • Y.-H. De Roeck: Résolution sur ordinateurs multi-processeurs de problèmes d’élasticité par décomposition de domaines. PhD thesis, CERFACS, Toulouse, France, 1991. TH/PA/91/04
  • P. R. Amestoy: Factorisation de grandes matrices creuses non symétriques basée sur une méthode multifrontale dans un environnement multiprocesseur. PhD thesis, CERFACS, Toulouse, France, 1991. TH/PA/91/03


The AVBP code from CERFACS at the heart of three PRACE projects from the 23rd call

CERFACS |  30 September 2021

Cerfacs is involved in three PRACE projects of the 23rd call for which hour allocation runs from 01/10/2021 to 30/09/2022. Researchers from ECL/LMFA UMR5509 (Ecole Centrale de Lyon) and IMFT (UMR 5502) laboratories have earned projects entirely based on the use of the LES solver developed by Cerfacs AVBP and involve the support of experts from the CFD and COOP teams underling the importance and effectiveness of collaborations between French labs and Cerfacs. Alexis Giauque from ECL/LMFA UMR5509 (Ecole Centrale de Lyon) has obtained not only one but two PRACE projects! The first project LESFAN (RA0101, 30 000 000 CPU hours on Irene/Rome TGCC) is based on the use of AVBP in the turbomachinery version to study the generation of noise by a fan of a real airplane engine. The second, PRACE-EDGES (RA0101, 40 000 000 CPU hours on Irene/Rome TGCC) focuses on LES modeling of dens gas in complex geometries. To do so, the LMFA Team has developed advanced thermodynamic closures in AVBP allowing the direct simulation of such flows. Laurent Selle from IMFT (UMR 5502) has received CPU hours for the GASTON project (RA0061, 30 000 000 CPU hours on Marenostrum BSC) which aims to study the structure of hydrogen flames in porous materials. For this, IMFT and Cerfacs will perform coupled simulations considering the reactive flow with AVBP as well as the conduction in the porous medium with AVTP which is known to play an central role in the flame stabilization process.Read more

watch the online contest ”my thesis in 180 sec” organized for Marie Curie actions

CERFACS |  24 September 2021

Next Thursday, Sept 30th the #FallingWallsLab #MSCA research presentation competition will take place, . This is a competition in which 15 researchers compete to deliver the best presentation of their research topic in the format "my thesis in 180 seconds" . Javier Crespo-Anadon, 3rd year PhD student in the CFD team is one of the 15 finalists and he will present this thesis topic: ignition in spinning combustion engines for a reduction in CO2 emissions! You can watch it online on the above website on Sept 30th at 3pm. I encourage you to go to the website and register!  You'll be able to listen to the other participants' pitches and vote for your favorite. Come and see for yourself what kind of research the EU funds!Read more