波と流れの共存場に置かれた円筒構造物の渦励振について

概要

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The phenomenon of vortex-induced vibration is an important engineering problem. Early studies were concentrated on the determination of either the fluctuating lift force on stationary circular cylinder or the vibratory respones of spring supported circular cylinder. Howerver, the vortex-induced vibration in the flow field where both current and wave coexist has not been investigated. The vortex-induced vibration of circular cylider structure in the wave-current coexisting field has been investigated experimentally. The experiments were carried out concerning the circular cylinder supported by spring with the variation of the reduced velocity from 1 to 5. In this paper present the measurement of the response of vortex-induced vibration, observation of flow field and lift force acting on the circular cylinder oscillating in-line with a steady current. The flow visualization of the water surface was made using bead of firing styrene whose diameter is 2-3mm. It concludes from the experimental results in the wave-current coexisting field that the circular cyinder structure vibrates greatly in the transverse direction with twice the period of incident wave.
社団法人日本船舶海洋工学会の論文
1998-09-04