流体と弾性変形する構造体の連成に関する基礎研究

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Introducing the velocity and acceleration potential, a nonlinear hydroelastic interaction between ideal fluid and floating elastic body is formulated in this report. In the formulation, elastic body motions are expressed by large amplitude rigid mode motions and small amplitude elastic vibrations superposed on it. Large amplitude free surface motion is also considered. Based on this formulation, a two dimensional simulation program was developed for the analysis of transient hydroelastic problems. In this simulation program, boundary element method (BEM) is used to solve the boundary integral equations of velocity potential and acceleration potential. Mixed Eulerian and Lagrangian method (MEL) is used to track the free surface motion. To validate the formulation and simulation program, free vibration of a hinged beam in unbounded fluid was simulated and the results were compared with analytical solution of Kito. Using this simulation program, two dimensional elastic beam impact on a wave crest was simulated. Simulated water surface impact is very transient. In the impact process, as wetted surface expands, added mass increases rapidly, the narrow peak impact pressure zone travels with very high speed and hydroelastic deformation takes place. Although the presented result in this paper is just a test trial of the simulation program and the resolution is not enough to catch the detail of the phenomenon, effect of elasticity to the impact is clearly observed and strong correlation between pressure and normal acceleration of vibration is confirmed.
独立行政法人海上技術安全研究所の論文
2001-04-02

流体と弾性変形する構造体の連成に関する基礎研究

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