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Double-diffusive convection

Published online by Cambridge University Press:  19 December 2013

P. Garaud
P. Garaud*
Affiliation:
Department of Applied Mathematics and Statistics, Baskin School of Engineering,University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
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Abstract

Much progress has recently been made in understanding and quantifying vertical mixing induced by double-diffusive instabilities such as fingering convection (usually called thermohaline convection) and oscillatory double-diffusive convection (a process closely related to semiconvection). This was prompted in parts by advances in supercomputing, which allow us to run Direct Numerical Simulations of these processes at parameter values approaching those relevant in stellar interiors, and in parts by recent theoretical developments in oceanography where such instabilities also occur. In this paper I summarize these recent findings, and propose new mixing parametrizations for both processes that can easily be implemented in stellar evolution codes.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 285 - 295
Copyright
© EAS, EDP Sciences, 2013

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