Dynamics of a superfluid flow past an obstacle are investigated by solving the Gross-Pitaevskii equation numerically. For appropriate velocity and size of the obstacle, quantized vortices are periodically generated in the wake, which form a Bénard-von Kármán vortex street. It is found that vibration of an obstacle modulates the vortex street, breaking a symmetry. The parameter dependence of the modulation dynamics of vortices is investigated.
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