Vortex shedding from circular cylinder in oscillatory incident flow

The response of the flow around stationary circular cylinder due to incident stream oscillations has been discussed here. The results demonstrate that the phenomenon of vortex-shedding lock-on is observed when the inlet mean flow has a periodical component characterized by properly matched frequency and amplitude. The effect of incident periodical changes on the surface pressure fluctuations in and outside lock-on regime has also been studied.