Cluster Resimulation Project
We pick up clusters of various
mass from the large-volume high resolution simulations,
and resimulate them at a higher mass resolution.
Members:
- Barbara Lanzoni (IAP, Paris)
- Volker Springel (MPA, Garching)
- Bepi Tormen (University of Padova, Padova)
- Simon White (MPA, Garching)
The first stage: N-body Simulation with 5123 particles
A high density model (tauCDM) and a low density model (lambda CDM)
are simulated in 320 Mpc/h and 480 Mpc/h boxes, respectively.
The calculations have been carried out on the T3E, a parallel
supercomputer at RechenZentrum Garching, using a message-passing
parallel version of HYDRA. Simulation parameters are tabulated here.
The second stage: Resimulation of clusters with higher mass resolution
Resimulations are done by using GADGET, a serial/parallel Tree-code for
N-body/SPH simulations.
The recipe of the resimulation is as follows:
- We use a group finding algorithm to
locate MANY clusters in
the simulation box.
- Pick a cluster, mark the particles in
it and trace them back to the initial time.
- Now we know where the particles were
initially. We replace them by a much large number of lower-mass
particles, add appropriate fluctuation on small scale, and resimulate
the formation of the cluster.
Here is the result from the first sequence
of simulations done by Volker Springel.
Last modified: Thu Jan 13 13:10:50 MET 2000
by Virgo Administrator