Flow Separation and Control
Reverse Karman street via lock-in of a turbulent wake
9:31 am – 9:44 amIt has long been long known that the periodic forcing of a bluff body wake can induce significant alterations to both the large-scale structures that are emanating from the body and to the mean-flow wake topology. These effects are greatly accentuated during ‘lock-in’, i.e. when the forcing frequency is made approximately equal to that of the naturally occurring vortex shedding instability.
Here, we present an experimental investigation of a turbulent wake lock-in via periodic oscillation of a solid plate. Our combined PIV and drag measurements show that, during lock-in, a drop in drag can be observed, associated with a reversal of the regular Karman street pattern.
Funding acknowledgement
ERC Starting Grant ONSET No. 101163321
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