G341 辺長比の小さい角柱に生じる空力不安定振動の発生機構に関する考察

概要

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The acrodynamic instability of a bluff plate is a great engineering concern not only for an academic interest, but also for practical applications. In the case of a bluff plate with depth/breadth ratio (D/B) smaller than D/B=0.6,unstable oscillation called low-speed galloping appcars at lower reduced velocity than the resonant reduced velocity. In this paper we discuss the physical mechanism for unstable acrodynamic phenomena of a bluff plate. We carry out experiment of flow visualization and three-dimensional numerical simulations of fluid flow around a stationary and an oscillating bluff plate. By using an clastically mounted bluff plate in a uniform flow, we clarify the unsteady flow structures around an oscillating bluff plate in low-speed galloping.
日本流体力学会の論文
2001-07-31