Journal article

Direct and large-eddy simulations of internal tide generation at a near-critical slope

Bishakhdatta Gayen, Sutanu Sarkar

JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2011

Abstract

A numerical study is performed to investigate nonlinear processes during internal wave generation by the oscillation of a background barotropic tide over a sloping bottom. The focus is on the near-critical case where the slope angle is equal to the natural internal wave propagation angle and, consequently, there is a resonant wave response that leads to an intense boundary flow. The resonant wave undergoes both convective and shear instabilities that lead to turbulence with a broad range of scales over the entire slope. A thermal bore is found during upslope flow. Spectra of the baroclinic velocity, both inside the boundary layer and in the external region with free wave propagation, exhibit..

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University of Melbourne Researchers