We perform two-dimensional radiation hydrodynamic
simulations of the supercritical/near-critical accretion
flows onto black holes. We find the supercritical
accretion is possible. Thick disk forms and radiatively
driven outflows appear above and below the disk. On the
other hand, near-critical disks exhibit the limit-cycle
oscillations, induced by the thermal and secular
instabilities in the radiation-pressure dominant region.
The resulting light curve is consistent with the
observations of GRS1915+105. Also, our simulations
succeed in reproducing the intermittent jets. |