畸形波作用下船舶甲板上浪的数值模拟研究

Numerical Simulation of Green Water on Freak Waves

畸形波对航行中的船舶极具威胁,其巨大的波高更容易产生甲板上浪现象,因此有必要对畸形波海况下的船舶甲板上浪问题进行研究.论文基于线性聚焦理论,利用波浪的色散特性产生畸形波,在二维数值水池中模拟了船舶与畸形波的非线性相互作用,并成功复原Greco的水池模型试验,验证了数值模拟方法的可行性.通过对甲板上浪高度的监测,研究了在相同有效波高下,规则波和畸形波甲板上浪行为的不同.本研究对完善极端海况下船舶结构和行驶安全的设计规范具有重要意义.

Freak wave,which is in possession of a huge wave height and may result in significant green water,is an extreme threat for ships sailing on the sea.Based on the linear focusing theory the freak wave was generated in a two-dimensional numerical wave tank to simulate the nonlinear interaction between the freak wave and the ship.In this study,the experiment of green water by Greco was successfully simulated by the numerical method.Then,by monitoring the wave elevation on deck,the difference of wave behavior between regular wave and freak wave was studied,which is of great significance for the structure and navigation safety of the ship under extreme sea conditions.