CERFACS CERFACS Scientific Activity Report Jan. 2010 â Dec. 2011

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INTRODUCTION (S. GRATTON) We have continued detailed discussions with EDF/SINETICS on parallel sparse direct methods for the solution of industrial problems in structural mechanics in the framework of the ANR Solstice project finished in June 2010. Our work on the optimization and linear algebraic aspects of data assimilation has been of great interest to and has been the subject of some discussions with the Climate Modeling and Global Change Group and Météo France. In the context of this collaboration, we have also hosted visits from Kristian Mogensen (ECMWF, UK), and from Patrick Laloyaux and Annick Sartenaer of the University of Namur, Belgium. This collaboration on data assimilation will continue in the coming years in the framework of the RTRA funded ADTAO project where efficient techniques for solving nonlinear least-squares problems will be developed. We have been working closely with TOTAL on the development of solvers on massively parallel computers for Helmholtz problems arising in their geophysical applications (PhD of Xavier Pinel). In this context, we have solved huge indefinite linear systems efficiently with preconditioned Krylov subspace methods. These solvers are part of a broader project aiming at determining the velocity field of the Earth sub-surface. This latter problem is formulated as a nonlinear least-squares problem that exhibits many local minima. The PhD of Y. Diouane focuses on the use of appropriate techniques from global optimisation to tackle this situation. We have also extended our collaboration with TOTAL in the direction of reservoir modeling, where we are expected to provide efficient solvers for solving problems issued from the discretization of coupled partial differential equations involving velocity, pressure and saturation variables. We assist the other Projects at CERFACS at all levels from the “over-a-coffee” consultancy to more major collaborations. These include advice on the elsA and the AVBP codes of CFD, in particular advice on the accuracy of their computations in a parallel environment, and many aspects of numerical algorithms with CFD and Global Change. We have also interacted with the CSG group on issues concerning new computer chips and technologies. S. Gratton. 6 Jan. 2010 – Dec. 2011
PARALLEL ALGORITHMS PROJECT Visitors to Parallel Algorithm Project in 2010-2011 In alphabetical order, our visitors in the years 2010-2011 included : MARIO ARIOLI (RAL, U.K.), MICHELE BENZI (Emory University, U.S.A), MIKE FISHER (ECMWF, Reading, U.K.), ANDREAS FROMMER (University of Wuppertal, Germany), JEAN-CHARLES GILBERT (INRIA Rocquencourt, France), AZZAM HAIDAR (University of Tennessee, Knoxville, U.S.A), MOHAMED HAMDAOUI (Ecole Centrale de Paris, France), PATRICK LALOYAUX (The University of Namur, Belgium) , ANDREAS LANGER (University of Linz, Austria) , JULIEN LANGOU (The University of Colorado at Denver, U.S.A.), SHERRY LI (University of California, U.S.A.), SCOTT MACLACHLAN (Tufts University, U.S.A.), GÉRARD MEURANT (CEA, Bruyères-le-Châtel, France), KRISTIAN MOGENSEN (ECMWF, U.K.), ESMOND NG (Lawrence Berkeley National Laboratory, Berkeley, U.S.A.), CORNELIS OOSTERLEE (Delft University of Technology, The Netherlands), DOMINIQUE ORBAN (Ecole Polytechnique de Montréal, Canada), VICTOR PICHENY (Ecole Centrale de Paris, France), MONSERRAT RINCON CAMACHO (University of Graz, Austria), PHILIPPE SAMPAIO (The University of Namur, Belgium), ANNICK SARTENAER (The University of Namur, Belgium), CHARLOTTE TANNIER (The University of Namur, Belgium), PHILIPPE TOINT (The University of Namur, Belgium), BORA UCAR (CNRS and ENS, Lyon, France), LUIS NUNES VICENTE (University of Coimbra, Portugal), CERFACS ACTIVITY REPORT 7
Page 1 and 2: CERFACS Scientific Activity Report
Page 3 and 4: Table des matières 1 Foreword xiii
Page 5 and 6: 9 Publications 40 9.1 Books . . . .
Page 7 and 8: 3 The OpenPALM coupler 104 3.1 Intr
Page 9 and 10: Table des figures CERFACS chart as
Page 11 and 12: TABLE DES FIGURES 6 Computational F
Page 13 and 14: Foreword Welcome to the 2010-2011 S
Page 15 and 16: CERFACS STRUCTURE CERFACS organizat
Page 17 and 18: CERFACS STAFF NAME POSITION PERIOD
Page 19 and 20: CERFACS STAFF SILVA GARZON Ph.D stu
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Page 23: CERFACS Wide-Interest Seminars Pete
Page 27 and 28: 1 Introduction 1.1 Introduction The
Page 29: PARALLEL ALGORITHMS PROJECT success
Page 33 and 34: 3 List of Members of HiePACS HiePAC
Page 35 and 36: 4 Dense and Sparse Matrix Computati
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Page 39 and 40: 5 Iterative Methods and Preconditio
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Page 57 and 58: 8 Conferences and Seminars 8.1 Conf
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ELECTROMAGNETISM AND ACOUSTICS TEAM
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1 Introduction Data assimilation is
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DATA ASSIMILATION 2.3 Calibrating o
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3 Data assimilation for atmospheric
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DATA ASSIMILATION BECM using or not
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DATA ASSIMILATION the potential vor
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DATA ASSIMILATION A two years simul
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DATA ASSIMILATION FIG. 4.1: Reducti
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DATA ASSIMILATION FIG. 4.3: April 2
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DATA ASSIMILATION by a surface mode
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6 Data assimilation with EDF neutro
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DATA ASSIMILATION demonstrate that
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DATA ASSIMILATION [DA13] S. Massart
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4 Coupling tools and HPC Climate Mo
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2 The OASIS coupler The OASIS coupl
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THE OASIS COUPLER 2.3 OASIS4 Since
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3 The OpenPALM coupler 3.1 Introduc
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THE OPENPALM COUPLER In the NitroEu
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4 HPC Climate modelling 4.1 General
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5 Publications 5.1 Conference Proce
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5 Climate Variability and Global Ch
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2 Climate variability and predictab
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CLIMATE VARIABILITY AND PREDICTABIL
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CLIMATE VARIABILITY AND PREDICTABIL
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CLIMATE CHANGE AND IMPACT STUDIES a
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CLIMATE CHANGE AND IMPACT STUDIES b
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PUBLICATIONS [CM15] Y. Kwon, C. Des
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1 Introduction The CFD (Computation
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2 Combustion The research activity
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COMPUTATIONAL FLUID DYNAMICS rate-o
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COMPUTATIONAL FLUID DYNAMICS FIG. 2
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COMPUTATIONAL FLUID DYNAMICS an iss
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COMPUTATIONAL FLUID DYNAMICS TU Ber
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COMPUTATIONAL FLUID DYNAMICS design
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COMPUTATIONAL FLUID DYNAMICS (a) (b
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COMPUTATIONAL FLUID DYNAMICS 3.1.5
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COMPUTATIONAL FLUID DYNAMICS (a) Ve
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COMPUTATIONAL FLUID DYNAMICS The cl
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COMPUTATIONAL FLUID DYNAMICS (a) Do
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5 Publications 5.1 Conferences Proc
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COMPUTATIONAL FLUID DYNAMICS [CFD34
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7 Aviation and Environment
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INTRODUCTION instead of regular ker
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SIMULATIONS OF AIRCRAFT WAKES AND R
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LARGE SCALE ATMOSPHERIC COMPOSITION
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LARGE SCALE ATMOSPHERIC COMPOSITION
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PUBLICATIONS 4.2 Technical Reports
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CERFACS CERFACS Scientific Activity Report Jan. 2010 â Dec. 2011

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CERFACS CERFACS Scientific Activity Report Jan. 2010 â Dec. 2011