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On the Turbulent Viscosity Prescription in Accretion Discs

Published online by Cambridge University Press:  12 April 2016

Patrick Godon
Patrick Godon*
Affiliation:
NASA/Jet Propulsion Laboratory, 4800 Oak Grove Dr., MS 238-332, Pasadena, CA 91109, USA

Abstract

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The validity of the standard α viscosity prescription in turbulent accretion discs is analyzed. It is found that the α viscosity prescription is no longer valid when the disc is not Keplerian.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, and is compared with the standard values of the viscosity in the boundary layer region and with the viscosity prescription derived from a general causal equation for the evolution of the stress tensor.

Type
Accretion Discs
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 109 - 110
Copyright
Copyright © Kluwer 1996

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