二维水波辐射问题的二阶时域解

Time-domain second-order wave radiation around two-dimensional body

用二阶理论在时域范围内研究二维二阶非线性水波的辐射问题，一阶、二阶问题分别满足各自的自由表面条件和物面条件，采用人工阻尼来吸收反射波．计算采用有限元法，对水平半圆柱体在水面的振荡问题进行了计算，计算了波高时间历程和水动力，计算结果与有关文献中的数据相比符合较好．

A time-domain secodorder method is employed to study nonliear wave radiation around two-dimen-sional body. The free-surface boundary condition and the they boundary condition are satisfied to second-order at each time step, renection waves are absorbed with edificial damping zone. The FEM with time marching is used to solve this problem. Oscillating of a horizonal semi-submerged circular cylinder is selected to confirm the validity of the calculation method. The time histories of wave elevations and hydredynamics on the cylinder are calculated.Some results are compared with those obtained by previous theory and experiment, and a satisfactory agreement is obtained.