The dependence of the viscosity in accretion discs on the shear/vorticity ratio

Details The dependence of the viscosity in accretion discs on the shear/vorticity ratio The dependence of the viscosity in accretion discs on the shear/vorticity ratio

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281l..21a&link_type=abstract

M.N.R.A.S., vol. 281, p. L21 (1996)

Physics

25

Accretion, Accretion Discs -- Black Hole Physics -- Turbulence

Scientific paper

We estimate the Shakura-Sunyaev viscosity parameter cc for different values of the shear/vorticity ratio, w, using local simulations of dynamo-generated turbulence. We find that the time average of cc is approximately proportional to co (at least for <10). We point out that this result may have important implications for the properties of thick accretion discs, because there w is small and cc would then tend to be large. Our result may also be important for accretion discs around black holes, because o becomes large in the inner 10 Schwarzschild radii as a result of relativistic effects.

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