Research on Strongly Nonlinear Fluid-Structure Interactions by Wave Impact and Its Applications

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The CIP-based Cartesian-grid calculation method for strongly nonlinear wave and rigid-body interaction problems was extended to treat the case of elastic-body motions in waves. A hybrid method was also developed, combining a 3D Rankine panel method for the hydrodynamic analysis and a finite-element method for computing elastic vibration modes, and the effect of elastic modes on wave-induced ship motions was investigated. Furthermore, a time-domain nonlinear calculation method based on the boundary element method was studied, which enabled us to simulate the interaction of wave impact and elastic motion of a vertical plate.Experimental studies were also done, measuring complicate fluid motion near the ship bow caused by the green-water impact by use of a high-speed camera.