HIGH   RESOLUTION  SPH   SIMULATION   OF  A VOID   REGION IN A ΛCDM  UNIVERSE



by
S. Gottlober, A. Klypin,  M. Hoeft, G. Yepes



SIMULATION    PARAMETERS.

Ω Λ=0.7, ΩΜ=0.3; Ωbar=0.02/h2 , h=0.7

Void region  of 20/h Mpc  size at z=0 extracted from a simulated Box  of  Lenght= 80 h-1 Mpc

For more information on the dark matter distribution in this simulation please read  astro-ph/0305393

Multi-mass refinement initial conditions:  with  4  levels of mass refinement ( Effective resolution 1024particles)


evolutuon of slice


SPH particle mass: =  6×106 h-1 Msun

Number of  SPH  particles  1.37x106

Total number of particles:  5×106 

Total number of individual Timesteps to complete simulation  311,272

Simulation run    in the AIP - BEOWULF  dual-ATHLON-MP 1.8+ Ghz computer with 16 nodes (32 processors)

Total  CPU Time to complete  simulation:  1519 hours (2 months)




Gravitational smoothing in refined area:   0.8 /h kpc

PHYSICAL PROCESSES INCLUDED IN SIMULATION:









VIDEOS





Time Evolution of 3D gas  density in an 20/h Mpc box  
centred at the  center of  mass of the void  at each timestep




GAS DENSITY  
(640x480 AVI Movie  with DIVX  compression  8 Mbytes)
gas density



2-Dimensional   slice through void center of mass of the  neutral hydrogen  density  at z =0
neutral hydrogen slice