Gasdynamic Investigation of Rotating Gas Accretion

Gasdynamic features of slowly rotating gas axisymmetric accretion onto a grav- itating center are investigated. The process of flow restructuring is studied as the angular velocity of accreting matter approaches the Keplerian angular veloc- ity. For spherically-symmetric accretion, the conditions are found of the existence of a steady-state supersonic solution for various external boundary conditions. The numerical study is performed on the basis of the Lax-Friedrichs-type second order of accuracy high-resolution numerical scheme with the implicit approximation of the source term in the Euler equations.