Example movies of HMCS-G output

Dwarf-all.avi

Simulation on the formation of a dwarf galaxy under ultraviolet background radiation in a cold dark matter-domineted universe. The hydrodynamics with radiative transfer of ultraviolet photons is solved with a newly developed radiation-SPH scheme. The evolution from redshift 100 to 3 is pursued. The green dots denote cold gas, the red dots are ionized gas and the blue dots are stars. First, baryonic gas falls into a dark matter potential to form filamentary structures. After the universe is reionized, metagalactic ultraviolet irradiates the filamentary clouds. Then, the bulk of gas is evaporated due to the heating by ultraviolet radiation, while a gas component shielded from ultraviolet radiation is converted into stars, then leaving small galaxies.

Dwarf-gas.avi

Same as Dwarf-all.avi, but just baryonic gas component is shown using volume rendering. Colors represent density levels in logarithmic scales.

In both simulations, a Linux PC cluster with 16 to 32 processors are used for HMCS client and a single board of GRAPE-6 is used. They are examples of hybrid computing of radiation hydrodynamics and gravity calculation. The numerical results are processed by 3-D volume rendering.