Article Dans Une Revue Journal of Fluid Mechanics Année : 2021

Long-time dynamics of internal wave

Takeshi Kataoka
  • Fonction : Auteur
T R Akylas
  • Fonction : Auteur
  • PersonId : 1113798

Résumé

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 (PV) 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 t = 120 T 0 , where T 0 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

Fichier principal
Vignette du fichier
200911_LongStream3.pdf (1.58 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

hal-03381656 , version 1 (17-10-2021)

Licence

Identifiants

Citer

Timothée Jamin, Takeshi Kataoka, Thierry Dauxois, T R Akylas. Long-time dynamics of internal wave. Journal of Fluid Mechanics, 2021, ⟨10.1017/jfm.2020.806⟩. ⟨hal-03381656⟩
62 Consultations
157 Téléchargements

Altmetric

Partager

  • More