Turbulence during the reflection of internal gravity waves at critical and near-critical slopes
Vamsi K Chalamalla, Bishakhdatta Gayen, Alberto Scotti, Sutanu Sarkar
JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2013
Direct numerical simulation is performed with a focus on the characterization of nonlinear dynamics during reflection of a plane internal wave at a sloping bottom. The effect of incoming wave amplitude is assessed by varying the incoming Froude number, Fr, and the effect of off-criticality is assessed by varying the slope angle in a range of near-critical values. At low Fr, the numerical results agree well with linear inviscid theory of near-critical internal wave reflection. With increasing Fr, the reflection process becomes nonlinear with the formation of higher harmonics and the initiation of fine-scale turbulence during the evolution of the reflected wave. Later in time, the wave respons..View full abstract
Awarded by NSF
We acknowledge financial support through NSF grant 0825705 (program manager E. Itsweire).