On the Maximal Value of the Turbulent alpha-Parameter in Accretion Discs

Details On the Maximal Value of the Turbulent alpha-Parameter in Accretion Discs On the Maximal Value of the Turbulent alpha-Parameter in Accretion Discs

2009-05-22

arxiv.org/abs/0905.3656v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, accepted to Astronomische Nachrichten

Scientific paper

In this short paper we show that making turbulence two- rather than three-dimensional may increase effective turbulent viscosity by about 40%. Dimensionless hydrodynamical viscosity parameter up to \alpha\_{max} = 0.25 M_t^2 may be obtained in this approach, that is in better agreement with the observational data on non-stationary accretion than the values obtained in numerical simulations. However, the \alpha-parameter values known from observations are still several times higher.

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