Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of large-scale vorticity in rotating stratified turbulence
  with inhomogeneous helicity: mean-field theory   We discuss a mean-field theory of generation of large-scale vorticity in a
rotating density stratified developed turbulence with inhomogeneous kinetic
helicity. We show that the large-scale nonuniform flow is produced due to ether
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.

18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an