| Summary: | 博士 === 國立成功大學 === 水利及海洋工程學系 === 103 === In this study a three-dimensional problem of interactions between waves and a floating structure with moorings is investigated. The problem considered is steady and periodic, and linear wave field, rigid floating structure, and catenary moorings are adopted. For the wave problem the diffracted wave and radiated wave are represented as one induced wave. The wave field is simulated using a boundary element method. The floating structure has six degrees of freedom. The catenary moorings are represented by a finite element model. In the solution the equations of the floating structure and the catenary cable are combined firstly through continuous connections of force and displacement. Then the entire problem is solved using structural equations together with the boundary element wave model. Using the three-dimensional numerical model of wave interaction with a moored floating structure developed in this study, the convergence calculation of numerical mesh is firstly illustrated. In what follows, a floating rectangular cuboid in the channel subjected to incident wave is simulated. The present numerical results are compared with numerical and experimental results by Sannasiraj et al. (1998) to demonstrate accuracy of the present model. Meanwhile the parameters used in three-dimensional simulations in the wave channel to simulate two-dimensional results are also investigated. Finally, the problems of a moored floating rectangular structure in the open sea subjected to incident waves of various directions are investigated. The simulated results include wave fields, structural motions of each degrees of freedom, and mooring forces
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