二维数值波浪水池中的潜体绕射试验

在摇板式造波机生成的二维数值波浪水池中进行了潜没圆柱的模拟绕射试验。先在频率域中确定造波机的运动形式 ,并在时间域中模拟摇板运动生成带有波前的高品质Stokes波的过程 ,作为入射波条件。数值造波和数值绕射试验采用边界积分方程的时间步进法 ,探讨了在自由面和板面交点处自由面条件与物面条件的相容性、开边界辐射面边界条件、时间与空间域上的数值离散方法等 ,得到了稳定、合理的波形和波浪力时域非线性结果 ,并与相应的频域二阶解的结果作了比较 ,证实了本数值波浪水池试验方法的适用性。

Diffraction test for a submerged body in 2-D numerical waves

The wave diffraction around a submerged circular cylinder was simulated numerically with two dimensional waves. A special wave maker motion mode was determined by analysis in the frequency domain and simulation in the time domain to generate Stokes waves with second order accuracy. Numerical simulation employed the time stepping boundary integral equation method. Particular consideration is paid to the compatibility of the free surface and the body surface conditions at the intersection point, the open boundary condition problem and the discretization of the space and time domains. The results show good simulation stability and accuracy which was confirmed by the second order solution in the frequency domain.