In the present study, the asymmetry of the cylinder was achieved by attaching a 90° V-grooved strip on the cylinder surface. Different flow regimes are present on the grooved and smooth halves. Under acoustic excitation, the flow regimes over the two halves are changed and the near wake structures of the grooved cylinder are modified. Further, the transition process is not stationary in time and two different transient processes are observed during the transition.

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