一様流中の弾性支持円柱における渦励振のシミュレーション(流体-構造連成問題の数値解析)

概要

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In many cases flow-induced vibration is generated by the mechanism which can hardly be foreseen at the designing the system, and it is difficult that to clarify the cause of the flow induced vibration. A vortices excited oscillation is one of the primary phenomena as flow-induced vibration, and many experimental studies are reported. However, there are few related to numerical simulations for vortices excited oscillation. In this paper, we develop a set of analysis techniques of fluid flow, the jacobian which include a time derivative, and the elastic curve mesh generating system for moving mesh, and simulated the vortices excited oscillation for elasticity supported circular cylinder which can be oscillated transversely and in-line along the flow direction. In the case of the cylinder oscillating transversely, we can simulate a lock-in phenomenon and the phase change of frequency for the lift and the cylinder vibration which are reported by experiment. On the other hand, in the case of in-line oscillation, two instability region, shedding a symmetric vortex from cylinder and existence of state of multi stability are simulated.
日本シミュレーション学会の論文
1993-12-15