The control of fluid mechanics and mass transfer in separated and reattaching
flow over a backward-facing step by a local forcing, is studied using Large
Eddy Simulation (LES). To control the flow, the local forcing is realized by
a sinusoidal oscillating jet at the step edge. The Reynolds number is varied
in the range 10000 ? Re ? 50000 and the Schmidt number is fixed at 1. The
found results show that the flow structure is modified and the local mass
transfer is enhanced by the applied forcing. The observed changes depend on
the Reynolds number and vary with the frequency and amplitude of the local
forcing. For the all Reynolds numbers, the largest recirculation zone size
reduction is obtained at the optimum forcing frequency St = 0.25. At this
frequency the local mass transfer enhancement attains the maximum.
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