Numerical simulations of two-dimensional and three-dimensional accretion flows

Details Numerical simulations of two-dimensional and three-dimensional accretion flows Numerical simulations of two-dimensional and three-dimensional accretion flows

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..183m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 15, 1992, p. 183-191.

Astronomy and Astrophysics

Astronomy

36

Accretion Disks, Three Dimensional Flow, Two Dimensional Flow, Euler Equations Of Motion, Incompressible Flow, Karman Vortex Street

Scientific paper

Numerical simulations of 2D and 3D accretion flows past a gravitating compact object from a uniform flow at a large distance upstream are performed by solving the Eulerian equations. The 2D flows exhibit a 'flip-flop instability' if the central accreting body is small. If the central body is enlarged at some instance in the oscillating flow, then the accretion shock shows a rather periodic oscillation similar to the von Karman vortex street. In the case of 3D flows, it is found that the shock cone is much more robust than in 2D, and the flip-flop instability takes a different, probably less violent, form. The causes of the instabilities are discussed.

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