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Mean-field theory of differential rotation in density stratified turbulent convection
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben-Gurion University of the Negev, Israel.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben-Gurion University of the Negev, Israel.
Number of Authors: 22018 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 84, no 2, article id 735840201Article in journal (Refereed) Published
Abstract [en]

A mean-field theory of differential rotation in a density stratified turbulent convection has been developed. This theory is based on the combined effects of the turbulent heat flux and anisotropy of turbulent convection on the Reynolds stress. A coupled system of dynamical budget equations consisting in the equations for the Reynolds stress, the entropy fluctuations and the turbulent heat flux has been solved. To close the system of these equations, the spectral tau approach, which is valid for large Reynolds and Peclet numbers, has been applied. The adopted model of the background turbulent convection takes into account an increase of the turbulence anisotropy and a decrease of the turbulent correlation time with the rotation rate. This theory yields the radial profile of the differential rotation which is in agreement with that for the solar differential rotation.

Place, publisher, year, edition, pages
2018. Vol. 84, no 2, article id 735840201
Keywords [en]
astrophysical plasmas, plasma nonlinear phenomena
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156744DOI: 10.1017/S0022377818000272ISI: 000431140300005OAI: oai:DiVA.org:su-156744DiVA, id: diva2:1219258
Available from: 2018-06-15 Created: 2018-06-15 Last updated: 2018-06-15Bibliographically approved

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