Shear Layer Vortex Shedding from Cylinders
Beyond a Re of about 1500 shear layer periodically rolls up into vortices.
The frequency of vortex formation is given by f ? 0.004 (Re)0.67
Strouhal number of 0.94 would occur roughly at Re=2500.
Seems possible that the frequency in the poststenotic flow will also scale with some appropriate Reynolds number.