1. Radiation Hydrodynamics with HMCS
CP-PACS: Hydrodynamics + Radiation
GRAPE-6 : Gravity
Computer
Physics
Method
SPH
(Smoothed Particle Hydrodynamics)
Hydrodynamics
CP-PACS
Radiation
Radiative Transfer Solver
GRAPE- 6
Self-Gravity
Direct Summation
SPH
 Superposition of extended karnels
 Full Lagrange method in 3D
Radiative Transfer Solver P1 P2
Source
Target E1 E2 E3 E4 E5 P3 P4 P5

2. Radiation Hydrodynamical Simulation on Galaxy Formation
Cosmic
Time
3D Radiation SPH
Calculation
Big Bang
10-44 sec
Results
 Elliptical galaxies forms under
strong UV
 Spiral galaxies forms under
Cosmic Recombination
0.1Myr
Weak UV
Cosmic Reionization
0.5Gyr
Initial
Strong UV
Initial
Galaxy Formation
2Gyr
Final
Final
White dots are stars and red dots are ionized gas.
15Gyr
(Present Day)