波浪冲洗对多浮冰耦合运动影响特性研究

Influence of overwash on the coupled motion of ice floes

冰缘区是开阔水域与海冰的交界区域,波浪与海冰的相互作用是决定该区域形态结构的主要因素。本文基于计算流体力学技术,采用速度入口造波方式建立二维数值波浪水池,利用动网格技术模拟多浮冰的耦合运动,在典型入射波参数范围内,研究了波浪中浮冰的垂荡和纵摇响应。同时,重点探究了波浪冲洗冰体表面现象,及其对浮冰耦合运动的影响,对比分析了有/无波浪冲洗冰体表面时的浮冰运动响应。数值结果表明:低密集度浮冰更容易产生波浪冲洗现象,且波浪冲洗对浮冰运动具有较明显的抑制作用。

A transition between open sea and ice-covered water is known as the marginal ice zone(MIZ),the structure of which is mainly determined by interactions between wave and ice.In this paper,a two-dimensional numerical wave tank(NWT)was established based on Computational Fluid Dynamics(CFD)technology.The wave was generated by imposing a specified velocity condition on the inlet boundary.The dynamic mesh technique was applied to simulate the coupled motion of multiple ice floes.The heave and pitch motion responses of ice floes in regular waves were studied within a range of typical incident wave parameters.The overwash phenomenon,as well as its impact on the coupling motion of ice floes,was investigated through comparison of motion response for ice floes with and without the barrier.The numerical result shows that in the case of less ice floes,the effect of overwash phenomenon is more prominent,and the ice motion will be suppressed significantly.