Volume 416, Number 3, March IV 2004
|Page(s)||825 - 827|
|Published online||09 March 2004|
A note on transition, turbulent length scales and transport in differentially rotating flows
NASA Ames Research Center, MS 245-3, Moffett Field, California 94035, USA
Corresponding author: D. Richard, firstname.lastname@example.org
Accepted: 8 January 2004
In this note we address the issue of hydrodynamical instabilities in Astrophysical rotating shear flows in the light of recent publications focused on the possibility for differential rotation to trigger and sustain turbulence in the absence of a magnetic field. We wish to present in a synthetic form the major arguments in favor of this thesis along with a simple schematic scenario of the transition to and self-sustenance of such turbulence. We also propose that the turbulent diffusion length scale scales as the local Rossby number of the mean flow. A new prescription for the turbulent viscosity is introduced. This viscosity reduces to the so-called β-prescription in the case of velocity profiles with a constant Rossby number, which includes Keplerian rotating flows.
Key words: hydrodynamics / instabilities / turbulence
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.