000014798 001__ 14798
000014798 005__ 20161115100202.0
000014798 04107 $$aeng
000014798 046__ $$k2016-08-21
000014798 100__ $$aLerisson, Gaétan
000014798 24500 $$aInternal Wave in the Ocean, Local, Global Stability and Transient Growth

000014798 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014798 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014798 506__ $$arestricted
000014798 520__ $$2eng$$aInternal gravity waves that exist in a continuously stratified fluid are particularly important in the ocean. They transport energy and are thought to generate turbulent mixing which contributes to the deep ocean circulation. Through fully non-linear and linear direct numerical simulations the stability of a gravity wave beam, we show that the stability properties and transient growth intensity strongly depend on the mean flow intensity. Small scale instabilities dominate for small mean flow as for internal tide. For lee waves or more generally strong mean flows, large scales lead the instability but small scales dominate the short time growth. Computing the linear impulse response of a monochromatic internal wave we propose an interpretation based on an extension of absolute and convective theory to 2D periodic base flow and make the connection with the classical triadic instability theory [1].

000014798 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014798 653__ $$a

000014798 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014798 720__ $$aLerisson, Gaétan
000014798 8560_ $$ffischerc@itam.cas.cz
000014798 8564_ $$s167314$$uhttps://invenio.itam.cas.cz/record/14798/files/TS.FM16-4.04.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1624, code TS.FM16-4.04
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000014798 962__ $$r13812
000014798 980__ $$aPAPER