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We conducted laboratory experiments on the flow around a circular cylinder moving at a constant velocity U0 close to an air-water interface in order to understand interference between vortex-shedding frequency from the cylinder and the free surface wave. The vortex street and the free surface profile were visualized for Reynolds number (Re = U0d/) between 200 and 15000 and for Froude number (Frh = U0/(hg) ) between 0.01 and 3.2 (d and h are the cylinder diameter and the distance between the top of the cylinder and the undisturbed water surface, respectively). At large Reynolds numbers (> 10), the surface deformation becomes substantial in the downstream of the cylinder and intermittent bubble entrainment by a jet-like flow is observed. The wave oscillation and the vortex shedding frequency are synchronized when the bubble entrainment is observed. From the Strouhal–Reynolds number relationship with gap ratio (a = h/d) between 0.25 and 2.0, the Strouhal number of the wave oscillation and that of vortex shedding increase with decreasing the gap ratio a.

Flow-induced Oscillations of an Air-water Interface and Intermittent Bubble Entrainment by Vortices behind a Moving Cylinder