Wavelet Multiresolution Analysis on Wake Structure of a Yawed Square Cylinder

The effect of yaw angle on wake characteristics behind a yawed square cylinder was examined at a Reynolds number (Re) of 3600. Velocity and vorticity fluctuations were measured using a one-dimensional hot-wire vorticity probe. It is found that the large-scale structures contribute the most to the streamwise and transverse velocity variances, as well as Reynolds shear stress, despite the reduction as α increases. The most significant contribution to the spanwise vorticity variance comes from the small-scale structures. The independence principle (IP) for vortex shedding is also validated for α  40.