Large scale properties in turbulent spherically symmetric accretion

Details Large scale properties in turbulent spherically symmetric accretion Large scale properties in turbulent spherically symmetric accretion

2003-09-09

arxiv.org/abs/astro-ph/0309259v2

Astrophys.J.627:368-375,2005

Astronomy and Astrophysics

Astrophysics

17 pages, AASTeX

Scientific paper

10.1086/430197

The role of turbulence in a spherically symmetric accreting system has been studied on very large spatial scales of the system. This is also a highly subsonic flow region and here the accreting fluid has been treated as nearly incompressible. It has been shown here that the coupling of the mean flow and the turbulent fluctuations, gives rise to a scaling relation for an effective "turbulent viscosity". This in turn leads to a dynamic scaling for sound propagation in the accretion process. As a consequence of this scaling, the sonic horizon of the transonic inflow solution is shifted inwards, in comparison with the inviscid flow.

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