Large eddy simulation of a stratified boundary layer under an oscillatory current
Bishakhdatta Gayen, Sutanu Sarkar, John R Taylor
JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2010
A numerical study based on large eddy simulation is performed to investigate a bottom boundary layer under an oscillating tidal current. The focus is on the boundary layer response to an external stratification. The thermal field shows a mixed layer that is separated from the external stratified fluid by a thermocline. The mixed layer grows slowly in time with an oscillatory modulation by the tidal flow. Stratification strongly affects the mean velocity profiles, boundary layer thickness and turbulence levels in the outer region although the effect on the near-bottom unstratified fluid is relatively mild. The turbulence is asymmetric between the accelerating and decelerating stages. The asym..View full abstract
Awarded by ONR
We are grateful for the support provided by ONR N000140810504, program monitor Scott Harper, to B. Gayen and S. Sarkar.