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VERTICAL MIXING OF MASS IN STABLY STRATIFIED CHANNEL FLOW WITH VERTICAL WALLS

Sutanu Sarkar
Mechanical and Aerospace Engineering, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093

Vincenzo Armenio
Dipartimento di Ingegneria Civile Universita degli Studi di Trieste 34127 Trieste, Italy; Dipartimento di Ingegneria Civile e Ambientale, Universitá di Trieste, Piazzale Europa 1, 34127 Trieste, Italy

Resumo

Stably-stratified flow of water through a channel with infinite side walls is studied using large eddy simulation. Mean shear in the horizontal plane promotes turbulence while the orthogonal buoyancy force tends to inhibit vertical fluctuations. The variation of horizontal momentum transport and vertical mass transport as a function of the generalized Richardson number, a measure of stratification relative to shear, is obtained. It is found that turbulence remains three-dimensional allowing vertical transport. Although the vertical eddy diffusivity decreases with increasing value of the local gradient Richardson number, it is generally larger than that in the more typical situation of flow in a channel with vertical shear.