Origin of cosmic structures ? Gravitational instability: non linear - PowerPoint PPT Presentation

Origin of cosmic structures ? Gravitational instability: non linear process, no analytical solution Use of N body and hydro simulations with high-resolution numerical methods LEGO 2006 Romain Teyssier 1

From the cosmic web… SSDS LEGO 2006 Romain Teyssier 2

…to individual galaxies Andromeda LEGO 2006 Romain Teyssier 3

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d LEGO 2006 Romain Teyssier 8

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10000h -1 kpc 2500h -1 kpc 630h -1 kpc 160h -1 kpc comoving Dark matter density Gas temperature z=3 Gas density Stellar density LEGO 2006 Romain Teyssier 13

A French initiative to promote extreme computing in cosmology Who ? What ? How ? 30 scientists Parallel computing 1/2 M � hardware support 6 institutes Visualization tools 1/2 TéraFlops dedicated computer 2 engineers, 5 post-docs Galaxy formation physics 6 nodes grid of AMD 64 quads 10 PhD students Theoretical Virtual Observatory http://www.projet-horizon.fr Sponsors : ANR Blanche Objectives of the Horizon Project: INSU, IN2P3, CEA, CNRS • Prepare, run and analyze large and massively // cosmological simulations Paris 6 & Paris 7 university • Build the necessary infrastructure to optimize their scientific exploitation Paris & Lyon Observatories • Promote among French scientists the expertise in computational cosmology Supercomputing in Europe: DEISA Extreme Computing Initiative RAMSES Horizon was selected with 27 Teyssier, R. A&A, 2002, 385, 337 other projects to run one Tree based AMR code extreme application on Mare Unsplit high-order Godunov Nostrum in Barcelona SC Galaxy formation physics (5th computer worldwide) Adaptive domain decomposition Source: http://www.deisa.org using “space filling curve” and http://www.top500.org MPI and F90 Present: Objectives: run RAMSES up to 2048 processors Good scalability up to 512 processors and 1024 3 particles Goal: 10 10 AMR cells with self-consistent cooling & Cooling & UV heating using external spectrum UV heating (spectrum & metals) Star formation and supernovae feedback Metal enrichment using galactic winds LEGO 2006 Romain Teyssier 14

Fin du diaporama LEGO 2006 Romain Teyssier 15