舰船顶浪遭遇畸形波的波浪水池数值模拟研究

畸形波对船舶航运极具威胁,已引发多起海上事故,因此有必要对舰船遭遇畸形波进行数值模拟。基于长峰波随机海浪模型,在相位调制生成畸形波的同时考虑了舰船航速的影响,可以对舰船在顶浪航行定时定点遭遇畸形波的非线性波浪环境进行建模,利用CFD生成数值波浪水池,并对畸形波生成过程中畸形参数、峰度、陡度的变化以及速度分量随深度的变化进行分析,从一定程度上反映畸形波的演化特性,并验证数值模拟的有效性。

Wave tank numerical simulation of ships in head sea encountering freak waves

The freak wave is a great threat to shipping, and has caused many marine accidents. It is necessary to carry out the numerical simulation of ships encountering freak waves. Based on the long-crested (unidirectional) random wave model, freak wave is generated by the phase modulation synchronously considering the inlfuence of ship speed. Then the nonlinear wave environment, which simulates the ships encountering freak waves at the appointed time and the position in head waves, can be numerically modeled. The numerical wave tank that is generated by the computational lfuid dynamics (CFD) can analyze the variation of the freak parameters, peak and steepness, and the velocity components varied with water depth. It can relfect the evolution characteristics of the freak waves to some extent, verify and validate the numerical simulation.