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Coherent structures in granulation convection and their importance for higher order closure models

Published online by Cambridge University Press:  01 August 2006

F. Kupka  and
F. J. Robinson
F. Kupka
Affiliation:
Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-Str. 1, 85741 Garching, Germany email: fk@mpa-garching.mpg.de
F. J. Robinson
Affiliation:
Dept. of Geology and Geophysics, Yale Univ., Box 208109, New Haven, CT 06520-8109, USA email: Frank.Robinson@yale.edu, marjf@astro.yale.edu Astronomy Department, Yale University, Box 208101, New Haven, CT 06520-8101, USA
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Abstract

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We use numerical simulations of granulation in the Sun and a K dwarf to study the effects of coherent structures on higher order moments. The latter need to be calculated in non-local Reynolds stress models of turbulent convection. Models that explicitly account for the asymmetry between up- and downflows as well as hot and cold drafts provide a substantial improvement over traditional ones, such as the quasi-normal approximation, which is only able to provide order of magnitude estimates for this type of flow.

Keywords

ConvectionturbulenceSun: atmosphereinteriorsstars: atmospheresinteriors
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 74 - 76
Copyright
Copyright © International Astronomical Union 2007

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