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Accueil > Actualités > Séminaires > Séminaires 2018

Mercredi 14 février 2018 à 11h00 en salle K118

Prof. Triantaphyllos AKYLAS, MIT, USA

Titre/Title : On the interaction of an internal wavepacket with its induced mean flow and the role of streaming

Contact : Chantal Staquet (Equipe MEIGE)

Résumé/Abstract : We consider three-dimensional gravity—inertia internal wavepackets in the form of beams with nearly monochromatic profile and discuss the coupled nonlinear interaction with their induced mean flow. This mean flow comprises : (i) an inviscid, purely modulation-induced component ; and (ii) streaming, associated with the production of mean potential vorticity via the combined action of dissipation and nonlinearity. The latter can have a profound effect on the beam profile by causing cross-beam refraction, transverse broadening and increased along-beam decay, in qualitative agreement with laboratory experiments (Bordes 2012).