Boundary layer flow beneath an internal solitary wave of elevation
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The wave-induced flow over a fixed bottom boundary beneath an internal solitary wave of elevation propagating in an unsheared, two-layer, stably stratified fluid is investigated experimentally. Measurements of the velocity field close to the bottom boundary are presented to illustrate that in the lower layer the fluid velocity near the bottom reverses direction as the wave decelerates while higher in the water column the fluid velocity is in the same direction as the wave propagation. The observation is similar in nature to that for wave-induced flow beneath a surface solitary wave. Contrary to theoretical predictions for internal solitary waves, no evidence for either boundary layer separation or vortex formation is found beneath the front half of the wave in the adverse pressure gradient region of the flow.
Carr , M & Davies , P A 2010 , ' Boundary layer flow beneath an internal solitary wave of elevation ' Physics of Fluids , vol 22 , no. 2 , 026601 . DOI: 10.1063/1.3327289
Physics of Fluids
Copyright 2010, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Fluids, Vol 22, Issue 2, and may be found at: http://scitation.aip.org/content/aip/journal/pof2/22/2/10.1063/1.3327289
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