【摘要】 本文在空间上应用面源法,在时间域上应用步进法,研究了浮体的非线性辐射效应。本文探讨了:(1)不同形式的辐射条件对非线性辐射问题解的影响;(2)不同距离的辐射面对开边界条件的使用所产生的影响;(3)大振幅的浮体受迫运动所产生的非线性效应。更多还原

【Abstract】 A computational model is presented for calculation of the nonlinear radiation problem of an arbitrary body in time domain. The semi-Lagrangian method has been used to simulate fully three-dimensional nonlinear free surface. A special treatment of the free surface and body intersection points is used, which avoids the difficulties associated with the singularity at the intersection points. The main topics in this paper are,(1) The effects of different typies of radiation conditions to the nonlinear radiation solution;(2) The effects of changing distances of the open boundary surface to the radiation solution under Orlanski’s open boundary condition;(3) The effects of changing amplitudes of body oscillations to the radiation solution.We have also used our computation program to calculate the examples given by Lin at al. The numerical results show good agreement with Lin’ s method of matching the finite computational domain to a linear outer solution.更多还原