浅水中质量源造波方法

The method of mass source wavemaker in shallow water

针对质量源造波过程中源区上方水体高度难以确定的问题提出了改进方法,将源区高度值考虑到源强方程中,避免了造波过程中源区上方水体高度值多次试算带来的不便。该方法弥补了质量源造波方法在水深小于1.5 m的浅水中所造波浪与理论波浪之间差距较大的缺陷,尤其是水平网格步长与源区高度值相比小于10的情况,推广了质量源造波方法在浅水中的应用。文中验证了波高对所造波浪的影响以及时间步长对浅水中所造波浪的影响,得出结论:当波高与水深的比值小于0.2时所造波浪波高与理论值的拟合较好;当时间步长小于0.005 s时所造波浪无明显的上下漂浮现象,波形稳定,符合理论波形要求。

In view of the problem that the distance between the top of the source region and the still water level is difficult to determine in the process of mass source wavemaker,the improved method was proposed in this paper.In the mass source functions took the height of the source region into account,the inconvenience of many trials to get the height of the mass source region can be eliminated in the process of wavemaker. This method remedies the defect that the difference between targeted wave and theoretical wave in the shallow water whose depth less than 1. 5m,especially horizontal grid step is an order of magnitude 10 smaller than the source region height,the mass source wave-maker method is promoted in the shallow water. The effects of wave height and the time step on simulated waves were studied. The conclusions show that the fitting between made wave and theoretical wave is good when the ratio of wave height and water depth is less than 0. 2; when the time step is less than 0. 005 s,the floating phenomenon of the simulated waves is well controlled,waves surface is stable and conforms to the requirements of the wave theory.