Abstract
A universal wake Strouhal number, St*= fsd′/Ub, has been proposed and is based upon the Strouhal frequency fs of the incident flow, the measured wake width d' at the end of the vortex formation region, and the mean velocity Ub at the edge of the separated boundary layer. This universal parameter collapses the characteristic wake scales for bluff bodies onto a single curve over the entire range of subcritical and transcritical wake Reynolds numbers Re*. The pressure drag, vortex shedding frequency and base pressure are related through a dependence between St CD, the product of the Strouhal number and drag coefficient, and the base pressure parameter K. There is a general collapse of the data up to K = 2, which is the upper limit thus far for bluff body flows.
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