Mixing through shear instabilities

Details Mixing through shear instabilities Mixing through shear instabilities

2000-08-17

arxiv.org/abs/astro-ph/0008270v1

Astronomy and Astrophysics

Astrophysics

9 pages, 12 figures, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2001.03951.x

In this paper we present the results of numerical simulations of the Kelvin-Helmholtz instability in a stratified shear layer. This shear instability is believed to be responsible for extra mixing in differentially rotating stellar interiors and is the prime candidate to explain the abundance anomalies observed in many rotating stars. All mixing prescriptions currently in use are based on phenomenological and heuristic estimates whose validity is often unclear. Using three-dimensional numerical simulations, we study the mixing efficiency as a function of the Richardson number and compare our results with some semi-analytical formalisms of mixing.

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