Two-dimensional viscous accretion disk models. II - On viscous overstability

Details Two-dimensional viscous accretion disk models. II - On viscous overstability Two-dimensional viscous accretion disk models. II - On viscous overstability

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..739k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 2, p. 739-747.

Astronomy and Astrophysics

Astrophysics

20

Accretion Disks, Astronomical Models, Flow Stability, Two Dimensional Models, Viscosity, Hydrodynamic Equations, Nonlinear Equations

Scientific paper

Accretion disks have been shown to be susceptible to pulsational overstability when the viscosity coefficient increases upon compression. In this study, the stability of an axisymmetric accretion disk with vertical structure is considered. 2D axisymmetric calculations were performed by solving the set of fully nonlinear hydrodynamic equations, including radiation transport. The time evolution of a representative section (ring) of a thin radiative accretion disk is studied. The existence of the overstability in 2D is confirmed. It is found that the presence of periodic oscillations near the outer boundary of a real disk might account for some of the low-amplitude flickering observed in dwarf novae.

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