Abstract
In the present paper, the powerful numerical method for a nonlinear wave forces acting on the plural vertical cylinder with arbitrary cross-sections was proposed.According to the present method, a second-order wave force can be obtained from a linear radiation potential without solving second-order boundary value problem. The boundary value problems for a linear radiation and diffraction potentials are solved with the hybrid boundary element method. The two method of numerical integration for a infinite integral on a free surface were showed and examined. One is the approximate integral method, in which infinite region is replaced by finite region and another is the numerical integral method with the Laguerre integration.The numerical results of maximum and second-order wave forces for the circular and rectangular cylinders obtained by the present method were compared with the experimental results. The property of the two numerical integration and the characteristics of the nonlinear wave forces were discussed.
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