1996/09/02 by S. Talon, Talon, S., J. -P. Zahn +2
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Fluid Dynamics and Turbulent Flows #Phase Equilibria and Thermodynamics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9609010
4 pages, LaTeX, using l-aa.sty, 1 eps figure included, accepted by A&A June 7th, 1996
arxiv created 1996/09/02 · openalex publication_date 1996/09/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We examine the role of anisotropic turbulence on the shear instabilities in a stratified flow. Such turbulence is expected to occur in the radiative interiors of stars, due to their differential rotation and their strong stratification, and the turbulent transport associated with it will be much stronger in the horizontal than in the vertical direction. It will thus weaken the restoring force which is caused by the gradient of mean molecular weight (μ). We find that the critical shear which is able to overcome the μ-gradient is substantially reduced by this anisotropic turbulence, and we derive an estimate for the resulting turbulent diffusivity in the vertical direction.