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CATEGORIES:Conferences/Seminars/Lectures
DESCRIPTION:Speaker: T.R. Akylas (MIT)\n\nTitle: Internal wave streaming
\n\nAbstract: \n\nRecently\, there has been a surge of research activity on
internal gravity wave beams – time-harmonic plane waves with locally confi
ned profile – in stratified fluids. These fundamental disturbances are man
ifestations of the inherent anisotropy of internal wave motion and are rele
vant in various geophysical processes. This presentation focuses on a comb
ined theoretical--experimental study of the nonlinear interaction of a thre
e-dimensional modulated internal wave beam with its induced mean flow in a
slightly viscous fluid. An asymptotic model is developed for the coupled w
ave--mean-flow dynamics\, which predicts the generation of two distinct typ
es of mean flow: (i) an inviscid\, purely modulation-induced mean flow akin
to that induced by surface wave packets\; and (ii) streaming\, a horizonta
l mean flow associated with the production of mean potential vorticity via
the combined action of dissipation and nonlinearity. Under laboratory flow
conditions in particular\, the latter type of mean flow is expected to dom
inate. The theoretical predictions\, over the entire mean-flow evolution\,
are in excellent agreement with laboratory experimental observations and N
avier--Stokes numerical simulations. [This is joint work with B. Fan (MIT)\
, T. Kataoka (Kobe University\, Japan)\, T. Jamin and T. Dauxois (ENS de Ly
on\, France).]
DTEND:20211214T203000Z
DTSTAMP:20240813T163529Z
DTSTART:20211214T193000Z
LOCATION:MIT - 77 Mass. Ave.\, Cambridge /\, Math Dept / Room 2-449
SEQUENCE:0
SUMMARY:Physical Mathematics Seminar
UID:tag:localist.com\,2008:EventInstance_38441479687992
URL:https://calendar.mit.edu/event/physical_mathematics_seminar_2236
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