自由界面との相互干渉によって生じる円柱後流の渦列と間欠的な気泡ジェット(境界層・せん断流・遷移(1),一般講演)

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  • Intermittent bubble injection by the oscillating Jet: the interference between a free surface and flow past a submerged cylinder

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We have conducted laboratory experiments on the flow past a circular cylinder moving at a constant speed U_0 beneath an air-water interface. The vortex street and the free surface profile are visualized for Reynolds number (Re=Ud/v) between 200 and 15,000 and for Froude number (Fr_h=U_0/(hg)^<1/2>) between 0.01 and 3.2 (d and h are the diameter of the cylinder and the distance between the top of the cylinder and the undisturbed water surface, respectively). At large Reynolds numbers (>10^4), the surface deformation becomes substantial in the downstream of the cylinder and intermittent bubble injection by a jet-like flow is observed. We have also investigated variation of the Strouhal-Reynolds number relationship with gap ratio (a=h/d) between 0.25 and 2.0, which shows the period of the vortex shedding becomes long when the gap ratio is small.

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