黏性水波场和水平方柱波浪载荷的数值模拟

随着海洋工程的快速发展，作用在建筑结构上的波浪力问题得到了广泛的重视．以N—S方程为控制方程，VOF法追踪自由面，通过在动量方程中加入简单动量源，建立了具有造波和消波功能的二维数值波浪水槽，模拟了水平方柱的波浪受力．通过实验验证：采用1倍波长造波区源项造波效果较好，解决了计算域内障碍物的二次波浪反射问题；光滑水平方柱的Morison公式推荐系数为CD=2．05和CM=1．9；作用于柱体上的黏性剪切力很小，可以忽略不计．表明建立的数值波浪水槽可用于水平方柱的波浪受力模拟。

Numerical Simulation of Viscous Wave Field and Wave Force on Horizontal Square Cylinder

Offshore engineering has been developing fast in recent years. The wave force on offshore structures is becoming a key factor to be considered. A 2D numerical wave tank to study the wave force on horizontal square cylinders was built. In this model, the governing equations are N-S equations. The air-water interface was tracked by VOF method. A simple momentum source method was employed to make and eliminate waves. Numerical results show that the present wave tank works well in making waves if one wave length of wave-making area is chosen. By comparing the calculated wave forces with those of Morison equation, the recommended Morison coefficients CD=2.05, CM--1.9 of the smooth horizontal square cylinder are obtained. Furthermore, it is found that the shear force acting on square cylinder is neglectable. It is concluded that the present wave tank can be applied to simulate the wave force acting on the horizontal square cylinder.