Abstract
motion,7 were observed. The vortex wake expanded for oscillation frequencies less than the Karman frequency, whereas it contracted for frequencies greater than the Karman frequency. The longitudinal spacing decreased significantly with increasing oscillation frequency and changed to a much lesser degree with an increase in the oscillation amplitude. In contrast, the lateral spacing of the shed vortices showed a relatively weaker dependence on the rotary oscillation. Further experiments on the vortex strength and formation are needed to better understand the characteristics of the various synchronized wake patterns.
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