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

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

Apr 14, 2023 160 likes •323 views

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

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Origin of cosmic structures ?

Gravitational instability: non linear process, no analytical solution Use of N body and hydro simulations with high-resolution numerical methods

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From the cosmic web…

SSDS

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…to individual galaxies

Andromeda

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d

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10000h-1kpc 2500h-1kpc 630h-1kpc 160h-1kpc Dark matter density Gas temperature Gas density Stellar density z=3 comoving

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A French initiative to promote extreme computing in cosmology

Who ? 30 scientists 6 institutes 2 engineers, 5 post-docs 10 PhD students What ? Parallel computing Visualization tools Galaxy formation physics Theoretical Virtual Observatory How ? 1/2 M hardware support 1/2 TéraFlops dedicated computer 6 nodes grid of AMD 64 quads http://www.projet-horizon.fr Objectives of the Horizon Project:

  • Prepare, run and analyze large and massively // cosmological simulations
  • Build the necessary infrastructure to optimize their scientific exploitation
  • Promote among French scientists the expertise in computational cosmology

Supercomputing in Europe: DEISA Extreme Computing Initiative

RAMSES Teyssier, R. A&A, 2002, 385, 337 Tree based AMR code Unsplit high-order Godunov Galaxy formation physics Adaptive domain decomposition using “space filling curve” MPI and F90 Horizon was selected with 27

  • ther projects to run one

extreme application on Mare Nostrum in Barcelona SC (5th computer worldwide) Source: http://www.deisa.org and http://www.top500.org Present: Good scalability up to 512 processors and 10243 particles Cooling & UV heating using external spectrum Star formation and supernovae feedback Objectives: run RAMSES up to 2048 processors Goal: 1010 AMR cells with self-consistent cooling & UV heating (spectrum & metals) Metal enrichment using galactic winds Sponsors: ANR Blanche INSU, IN2P3, CEA, CNRS Paris 6 & Paris 7 university Paris & Lyon Observatories

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Fin du diaporama