Wake Control Based on Spanwise Sinusoidal Perturbations

The effectiveness of a passive sinusoidal perturbation method, applied on the upstream faces of square cylinders at a wavelength that corresponds to the wavelength of the intermediate wake instability mode, is experimentally investigated. Hot-wire measurements are taken to examine the effect of three different sinusoidal perturbation amplitudes as compared to the straight cylinder case. Good agreement is found between high- and...