Abstract
An experimental and computational investigation of unsteady turbulent wake flows past a two-dimensional square cylinder with planar jet injection from its base into the vortex formation region is presented and discussed. Detailed measurements of the mean and turbulent near wake development at a Reynolds number of 8520 and for various jet to approach flow velocity ratios were obtained with Laser Doppler Velocimetry to examine the aerodynamic performance of the wake flow under the complex jet/wake interaction arrangement. In the complementary computational work a Large Eddy Simulation procedure was employed to help analyze the rich variety of wake flow patterns that were identified in the experiments. Subgrid scale motions were modeled with a first-order closure utilizing an anisotropic subgrid eddy-viscosity and a prognostic equation for the subgrid scale turbulent kinetic energy. The detailed results help to evaluate the effects of base injection on the mean and turbulent characteristics of the near wake region while at the same time the performance of the computational model is appraised by comparing simulations with measurements for the range of the complex flow configurations studied here.
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