Gas dynamic investigation of rotating gas accretion

Abstract

We study axisymmetric accretion of slowly rotating matter onto a gravitation center. The process of the flow restructuring is presented as the angular velocity of accreting gas approaches the Keplerian velocity. For spherically-symmetric accretion we found conditions of existence of steady-state supersonic solutions for various external boundary conditions. These conditions are used for choosing proper initial and boundary conditions for accretion of the rotating matter. The study is performed on the basis of the numerical solution of the Euler gas dynamic equations using the second order extension of the Lax-Friedrichs scheme with the implicit approximation of the source term.