Numerical computation of two dimensional wind accretion of isothermal gas
Eiji Shima 1,
Takuya Matsuda 2,
Ulrich Anzer 3,
Gerhard Börner 3 and
Henri M.J. Boffin 4
Received 21 April 1998 / Accepted 22 June 1998
A new numerical algorithm for calculating isothermal wind accretion flows has been developed and is applied here to the analysis of the hydrodynamics of two-dimensional plane symmetric accretion flows in wind-fed sources. Polar coordinates are used to ensure fine resolution near the object. It is found that a thin accretion column is formed which shows wave-like oscillations. Small accretion disks are formed temporarily around the object. Mass accretion rate and angular momentum accretion rate exhibit quasi-periodic oscillations. The amplitudes of the oscillations depend on the size of the inner boundary, the number of grid points and the method of calculation. For a smaller size of the inner boundary, finer grids and more accurate numerical schemes, the amplitudes of the oscillation become larger.
Key words: accretion, accretion disks hydrodynamics instabilities shock waves methods: laboratory stars: pulsars: general
Send offprint requests to: U. Anzer
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© European Southern Observatory (ESO) 1998
Online publication: August 6, 1998