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Internal gravity waves in the energy and flux budget turbulence-closure theory for shear-free stably stratified flows
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Ben Gurion Univ Negev, Dept Mech Engn, POB 653, IL-8410530 Beer Sheva, Israel.;Nordita Stockholm Univ, S-10691 Stockholm, SwedenUniv Helsinki, Inst Atmospher & Earth Syst Res, Helsinki 00014, Finland..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Ben Gurion Univ Negev, Dept Mech Engn, POB 653, IL-8410530 Beer Sheva, Israel.;Nordita Stockholm Univ, S-10691 Stockholm, SwedenUniv Helsinki, Inst Atmospher & Earth Syst Res, Helsinki 00014, Finland..
Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod 603950, Russia..
Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod 603950, Russia..
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2019 (English)In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 99, no 6, article id 063106Article in journal (Refereed) Published
Abstract [en]

We have advanced the energy and flux budget turbulence closure theory that takes into account a two-way coupling between internal gravity waves (IGWs) and the shear-free stably stratified turbulence. This theory is based on the budget equation for the total (kinetic plus potential) energy of IGWs, the budget equations for the kinetic and potential energies of fluid turbulence, and turbulent fluxes of potential temperature for waves and fluid flow. The waves emitted at a certain level propagate upward, and the losses of wave energy cause the production of turbulence energy. We demonstrate that due to the nonlinear effects more intensive waves produce more strong turbulence, and this, in turn, results in strong damping of IGWs. As a result, the penetration length of more intensive waves is shorter than that of less intensive IGWs. The anisotropy of the turbulence produced by less intensive IGWs is stronger than that caused by more intensive waves. The low-amplitude IGWs produce turbulence consisting up to 90% of turbulent potential energy. This resembles the properties of the observed high-altitude tropospheric strongly anisotropic (nearly two-dimensional) turbulence.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 99, no 6, article id 063106
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Physical Sciences
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URN: urn:nbn:se:kth:diva-255318DOI: 10.1103/PhysRevE.99.063106ISI: 000473029000006Scopus ID: 2-s2.0-85068255962OAI: oai:DiVA.org:kth-255318DiVA, id: diva2:1340977
Note

QC 20190807

Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07Bibliographically approved

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Kleeorin, NathanRogachevskii, lgor

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