畸形波作用下浮体的载荷与响应研究新方法

A new research method on loads and response of floating bodies under freak wave

基于线性波叠加原理,采用能量聚焦的方法在二维粘性数值波浪水池中生成畸形波。基于流固耦合理论与切片原理,提出一种快速便捷的模拟波物相互作用的新方法,模拟了浮式体遭遇畸形波的过程,计算得到了甲板上浪水位高度、上浪水体对浮体的砰击压强、结构物的运动响应及波物相互作用的响应云图等。其中,波浪谱采用JONSWAP谱,流场控制方程为不可压缩流体的连续方程和N-S方程,自由液面由VOF法来捕捉,在数值水池尾段的动量方程中添加源项以消除后端壁面的波浪反射。

Based on linear superposition principle, energy focusing is applied to simulate the freak wave in the 2D nu- merical wave tank with viscosity. Based on Fluid-solid coupling theory and Slicing principle, this paper proposes a fast and convenient method on simulating the interaction between waves and floating bodies therefore, the process of floating bodies encountering the freak wave is reproduced, and the height of green water, slamming, motion response of the floating bodies and the response cloud figure are got through from the simulation. JONSWAP is regard as the wave spectrum, the governing equation of flow field is the continuity equation and N-S equation of incompressible fluid, the volume of fluid （VOF） meth- od are adopted to track the free surface, and a source term is added to the momentum equation of the end of the numerical wave tank to eliminate the wave reflection.