Generation of large-scale vorticity in rotating stratified turbulence with inhomogeneous helicity: Mean-field theory

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Abstract

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.

Original languageAmerican English
Article number735840303
JournalJournal of Plasma Physics
Volume84
Issue number3
DOIs
StatePublished - 1 Jun 2018

Keywords

  • Astrophysical plasmas
  • Plasma nonlinear phenomena

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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