A NUMERICAL MODEL FOR 3-D FLOATING BODY MOTION IN NONLINEAR WAVES USING THE B. E. M.

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  • 境界要素法を用いた浮体構造物の3次元非線形挙動解析

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A numerical model is developed for 3-D floating body motion in nonlinear waves, solving the B. E. M. on the velocity and acceleration potentials. Then the movement of the element nodes on the free water surface is evaluated to coincide with the 3-D motion of water particle by the Mixed Eularian and Lagrangian method (MEL) and their movement must strictly satisfy the dynamic boundary condition. Based on the six-degrees of freedom motion solved, the movement of the element nodes on the floating body surface is evaluated and updated. The validity of this numerical model is verified through the comparison with the theoretical solutions of nonlinear waves, the nonlinear 2D-B. E. M. and experimental results. This numerical model is extended for the 3-D floating body motion in a semi-closed mooring basin surrounded by breakwaters with the opening and discussed.

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