On the turbulent viscosity prescription in accretion discs

Details On the turbulent viscosity prescription in accretion discs On the turbulent viscosity prescription in accretion discs

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277..157g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 1, pp. 157-162.

Astronomy and Astrophysics

Astronomy

12

Accretion, Accretion Discs, Hydrodynamics, Turbulence

Scientific paper

The validity of the standard alpha viscosity prescription in turbulent accretion discs is briefly analysed. It is found that the alpha viscosity prescription is no longer valid when the rotation law of the disc is not Keplerian. The analysis is based on simple scaling arguments for fully developed turbulences in accretion discs. An analytical treatment is carried out for geometrically thin non-Keplerian discs in vertical hydrostatic equilibrium. The analytical expression of the viscosity is compared with standard values of the viscosity in boundary layer regions and with the viscosity prescription derived from a general causal equation for the evolution of the stress tensor.

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