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Generation of large-scale vorticity in rotating stratified turbulence with inhomogeneous helicity: mean-field theory
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2018 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 84, no 3, article id 735840303Article in journal (Refereed) Published
Abstract [en]

We discuss a mean-field theory of the generation of large-scale vorticity in a rotating density stratified developed turbulence with inhomogeneous kinetic helicity. We show that the large-scale non-uniform flow is produced due to either a combined action of a density stratified rotating turbulence and uniform kinetic helicity or a combined effect of a rotating incompressible turbulence and inhomogeneous kinetic helicity. These effects result in the formation of a large-scale shear, and in turn its interaction with the small-scale turbulence causes an excitation of the large-scale instability (known as a vorticity dynamo) due to a combined effect of the large-scale shear and Reynolds stress-induced generation of the mean vorticity. The latter is due to the effect of large-scale shear on the Reynolds stress. A fast rotation suppresses this large-scale instability.

Place, publisher, year, edition, pages
CAMBRIDGE UNIV PRESS , 2018. Vol. 84, no 3, article id 735840303
Keywords [en]
astrophysical plasmas, plasma nonlinear phenomena
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-231723DOI: 10.1017/S0022377818000417ISI: 000435235200007OAI: oai:DiVA.org:kth-231723DiVA, id: diva2:1238805
Note

QC 20180814

Available from: 2018-08-14 Created: 2018-08-14 Last updated: 2018-08-14Bibliographically approved

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Kleeorin, NathanRogachevskii, l.
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