圆柱在波浪中入水的数值模拟

为了研究波浪对圆柱入水过程的影响，采用二维CFD(Computational Fluid Dynamic)方法数值模拟了圆柱在规则波中的入水过程.该方法采用自由液面捕捉法和直角切割网格系统分别处理自由液面和物体动边界，结合推板造波和海绵阻尼消波原理而实现数值造消波，并分析波浪参数(波高、周期和圆柱入水时的波浪相位)对圆柱入水动力特性的影响.以在波浪中的起重船上悬吊圆柱入水作为工程应用实例进行数值模拟，研究不同工况下绳索的张力变化和重物的运动特性.

Numerical Study on Cylinder Entering Water in Wave

In order to study the influence of wave on water entry of cylinder, a CFD method was presented to numerically simulate the physical process of cylinder vertically entering water in regular wave. In this method, free surface capturing method and Cartesian cut cell mesh system were adopted to treat moving free surface and solid boundary. In combination with the theories of a piston type wave making and sponge damping wave absorbing, the CFD method was applied in the implementation of numerical wave making and absorbing. Furthermore, the effect of wave parameters (wave height, wave period, wave phase versus cylinder touching free surface, and so on) on the hydrodynamic was analyzed. Finally, the application case of lifting operation from a crane ship in wave was numerically simulated, and the tension variation of wire and motion characteristic of cylinder under different working conditions were mainly studied.