Negative turbulent production during flow reversal in a stratified oscillating boundary layer on a sloping bottom
Date
2011
Authors
Gayen, Bishakhdatta
Sarkar, S
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Publisher
American Institute of Physics
Abstract
Three-dimensional direct numerical simulations are performed to model an internal tidal beam at near-critical slope, and the phase dependence of turbulent processes is investigated. Convective instability leads to density overturns that originate in the upper flank of the beam and span the beam width of 6 m during flow reversal from downslope to upslope boundary motion. During this flow reversal event, negative turbulent production is observed signaling energy transfer from velocity fluctuations to the mean flow. In this note, we explain the mechanism underlying negative production.
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Keywords
Keywords: Beam widths; Boundary motion; Convective instabilities; Downslope; Flow reversals; Mean flow; Oscillating boundaries; Phase dependence; Sloping bottom; Turbulent process; Velocity fluctuations; Energy transfer; Three dimensional; Oscillating flow
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Source
Physics of Fluids
Type
Journal article
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Open Access
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Restricted until
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