Hydrodynamic α-effect in a rotating stratified moist atmosphere driven by small-scale non-helical force

In this paper we have studied the large-scale instability in a rotating stratified moist atmosphere with a small-scale turbulence. The axis of rotation of the medium is deviated from the vertical direction. The turbulence is excited by an external small-scale force with zero helicity and a low Reyno...

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Bibliographic Details
Published in:Geophysical and astrophysical fluid dynamics 2021-11, Vol.115 (5-6), p.551-576
Main Authors: Kopp, M. I., Tur, A. V., Yanovsky, V. V.
Format: Article
Language:English
Subjects:
Asymptotic methods
Asymptotic series
Atmosphere
Axes of rotation
Coriolis force
Fluid flow
Helicity
Hydrodynamic α-effect
multi-scale asymptotic expansions
Nonlinear equations
Reynolds number
small-scale non-helical turbulence
Small-scale turbulence
stratification of moist atmosphere
Turbulence
Vortices
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Summary:In this paper we have studied the large-scale instability in a rotating stratified moist atmosphere with a small-scale turbulence. The axis of rotation of the medium is deviated from the vertical direction. The turbulence is excited by an external small-scale force with zero helicity and a low Reynolds number. The nonlinear equations of a vortex dynamo were obtained on the basis of the method of multiscale asymptotic expansions. The linear instability and stationary nonlinear modes were studied. The solutions in a form of localized vortex structures were obtained.
ISSN:0309-1929
1029-0419
DOI:10.1080/03091929.2021.1946802