Accretion in numerical simulations of twodimensional flows
Abstract
High energy phenomena in astrophysics are thought to be powered by highly efficient central engines made of a compact object accreting mass from its surroundings. The trapped gas generally possesses angular momentum which must be transferred to the outer parts of the disc in order to fall inwards and liberate gravitational binding energy. The authors consider plane supersonic accretion flow in a Newtonian potential and develop the numerical treatment in order to study its behaviour and stability against perturbations. Computations show that shear instability alone is not sufficient to destabilize a quasi Keplerian supersonic accreting flow for local Reynolds numbers of the order of 50.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 March 1988
 Bibcode:
 1988A&A...193..131S
 Keywords:

 Magnetohydrodynamic Flow;
 Stellar Mass Accretion;
 Supersonic Flow;
 Two Dimensional Flow;
 Angular Momentum;
 Astronomical Maps;
 Flow Stability;
 Perturbation Theory;
 Reynolds Number;
 Astrophysics