ABSTRACT

Freak waves are a type of extreme waves with great wave heights and concentrated energies. When they encounter ships, large amounts of water flow onto deck and lead to strong impact pressures, threatening the structural safety significantly. Many efforts concerned about green water phenomena, while few of them focused on that induced by freak waves. This paper investigates the green water events induced by freak waves in three-dimensional numerical wave tank, which is validated well against experimental data under regular waves. The Peregrine breather solution model is applied to simulate freak wave and a 3D hull structure is modelled to head it. In this study, the water motion scenario is observed and several characteristic stages are classified. The impact pressures on deck and superstructure are analysed and the three-dimensional effect is discussed. At last, the features and dangerous moments of this type of green water events are concluded.

摘要

怪波是一种波高大、能量集中的极端波。当它们遇到船舶时，大量的水流到甲板上，产生很强的冲击压力，对结构安全构成严重威胁。许多努力关注绿水现象，而很少有人关注由怪波引起的绿水现象。本文研究了三维数值波浪水槽中由怪波引起的绿水事件，并与规则波浪下的实验数据进行了很好的验证。Peregrine 呼吸器解决方案模型用于模拟异常波，并通过建模 3D 船体结构来引导它。在这项研究中，观察了水运动场景，并对几个特征阶段进行了分类。分析了甲板和上层建筑的冲击压力，讨论了三维效应。最后总结了此类绿水事件的特点和危险时刻。