Abstract
This study is concerned with a theoretical and laboratory investigation of selective withdrawal of a linearly stratified fluid through a line sink at the base of a reservoir with a side contraction. The width-averaged equations of motion are solved numerically. The evolution of selective withdrawal and the flow properties at the steady state are studied. Using the numerical results, an equation is proposed for the withdrawal layer thickness, the critical Froude number, and the density thickness. For comparison, experiments were conducted in a flume and particle image velocimetry technique was used to capture the flow field upstream of a contraction during evolution of selective withdrawal. In general, a good agreement is obtained between the numerical and experimental results. It is found that the presence of a contraction causes the withdrawal layer to be thicker than in a uniform reservoir, but thinner than that in a reservoir with a sill of comparable protruding dimension.
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