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dc.contributor.authorJamin, Timothée
dc.contributor.authorKataoka, Takeshi
dc.contributor.authorDauxois, Thierry
dc.contributor.authorAkylas, TR
dc.date.accessioned2021-12-10T18:41:26Z
dc.date.available2021-12-10T18:41:26Z
dc.date.issued2021
dc.identifier.urihttps://hdl.handle.net/1721.1/138430
dc.description.abstract© 2020 BMJ Publishing Group. All rights reserved. The mean flow induced by a three-dimensional propagating internal gravity wave beam in a uniformly stratified fluid is studied experimentally and theoretically. Previous related work concentrated on the early stage of mean-flow generation, dominated by the phenomenon of streaming - a horizontal mean flow that grows linearly in time - due to resonant production of mean potential vorticity in the vicinity of the beam. The focus here, by contrast, is on the long-time mean-flow evolution. Experimental observations in a stratified fluid tank for times up to, where is the beam period, reveal that the induced mean flow undergoes three distinct stages: (i) resonant growth of streaming in the beam vicinity; (ii) saturation of streaming and onset of horizontal advection; and (iii) establishment of a quasi-steady state where the mean flow is highly elongated and stretches in the along-tank horizontal direction. To capture (i)-(iii), the theoretical model of Fan et al. (J. Fluid Mech., vol. 838, 2018, R1) is extended by accounting for the effects of horizontal advection and viscous diffusion of mean potential vorticity. The predictions of the proposed model, over the entire mean-flow evolution, are in excellent agreement with the experimental observations as well as numerical simulations based on the full Navier-Stokes equations.en_US
dc.language.isoen
dc.publisherCambridge University Press (CUP)en_US
dc.relation.isversionof10.1017/JFM.2020.806en_US
dc.rightsCreative Commons Attribution-Noncommercial-Share Alikeen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/en_US
dc.sourceOther repositoryen_US
dc.titleLong-time dynamics of internal wave streamingen_US
dc.typeArticleen_US
dc.identifier.citationJamin, Timothée, Kataoka, Takeshi, Dauxois, Thierry and Akylas, TR. 2021. "Long-time dynamics of internal wave streaming." Journal of Fluid Mechanics, 907.
dc.relation.journalJournal of Fluid Mechanicsen_US
dc.eprint.versionOriginal manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/NonPeerRevieweden_US
dc.date.updated2021-12-10T18:38:44Z
dspace.orderedauthorsJamin, T; Kataoka, T; Dauxois, T; Akylas, TRen_US
dspace.date.submission2021-12-10T18:38:46Z
mit.journal.volume907en_US
mit.licenseOPEN_ACCESS_POLICY
mit.metadata.statusAuthority Work and Publication Information Neededen_US


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