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Generation of a large-scale vorticity in a fast-rotating density-stratified turbulence or turbulent convection
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Ben Gurion Univ Negev, Dept Mech Engn, POB 653, IL-8410530 Beer Sheva, Israel..
2019 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 100, no 6, article id 063101Article in journal (Refereed) Published
Abstract [en]

We find an instability resulting in generation of large-scale vorticity in a fast-rotating small-scale turbulence or turbulent convection with inhomogeneous fluid density along the rotational axis in anelastic approximation. The large-scale instability causes excitation of two modes: (i) the mode with dominant vertical vorticity and with the mean velocity being independent of the vertical coordinate; (ii) the mode with dominant horizontal vorticity and with the mean momentum being independent of the vertical coordinate. The mode with the dominant vertical vorticity can be excited in a fast-rotating density-stratified hydrodynamic turbulence or turbulent convection. For this mode, the mean entropy is depleted inside the cyclonic vortices, while it is enhanced inside the anticyclonic vortices. The mode with the dominant horizontal vorticity can be excited only in a fast-rotating density-stratified turbulent convection. The developed theory may be relevant for explanation of an origin of large spots observed as immense storms in great planets, e.g., the Great Red Spot in Jupiter and large spots in Saturn. It may be also useful for explanation of an origin of high-latitude spots in rapidly rotating late-type stars.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 6, article id 063101
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-266276DOI: 10.1103/PhysRevE.100.063101ISI: 000499982900010Scopus ID: 2-s2.0-85076486377OAI: oai:DiVA.org:kth-266276DiVA, id: diva2:1383594
Note

QC 20200108

Available from: 2020-01-08 Created: 2020-01-08 Last updated: 2020-01-08Bibliographically approved

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