Abstract
This paper presents an investigation of the Reynolds number effect on vorticity in the turbulent intermediate wake of a circular cylinder. All three components of the vorticity vector were simultaneously measured using a multi-X-wire probe. The measured data were analyzed by a wavelet multi-resolution technique that decomposed each vorticity component into a number of wavelet components based on different characteristic frequencies. It is observed that the measured rms values of all the vorticity components increase as Reynolds number increases. However, the spanwise worticity variance of large and intermediate-scale structures are quite evenly contribution at Re=5000 and 2500, respectively.
