On the Turbulent Viscosity Prescription in Accretion Discs

  • Patrick Godon
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 208)


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 It is found that the α viscosity prescription is no longer valid when the disc is not Keplerian.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.


Stress Tensor Mach Number Accretion Disc Fluid Mechanics Turbulent Velocity 
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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Patrick Godon
    • 1
  1. 1.NASA/Jet Propulsion LaboratoryPasadenaUSA

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