Tidal conversion and turbulence at a model ridge: direct and large eddy simulations
Narsimha R Rapaka, Bishakhdatta Gayen, Sutanu Sarkar
JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2013
Abstract Direct and large eddy simulations are performed to study the internal waves generated by the oscillation of a barotropic tide over a model ridge of triangular shape. The objective is to go beyond linear theory and assess the role of nonlinear interactions including turbulence in situations with low tidal excursion number. The criticality parameter, defined as the ratio of the topographic slope to the characteristic slope of the tidal rays, is varied from subcritical to supercritical values. The barotropic tidal forcing is also systematically increased. Numerical results of the energy conversion are compared with linear theory and, in laminar flow at low forcing, they agree well in s..View full abstract
Awarded by ONR grant
We are grateful for the support of ONR grant N00014-09-1028 (program manager Dr T. Paluszkiewicz). We would also like to thank the referees whose helpful suggestions improved the quality of this paper.