箱形船体波浪和波浪压力的非线性时域模型

TIME-DOMIAN MODEL OF NONLINEAR WAVE FORCES ON A BOX-SHAPED SHIP

该文将耦合计算模型应用于计算固定箱形船体上非线性波浪压力,研究了将该准三维模型应用于物体三维波浪压力的计算能力。为了提高计算强非线性波浪的能力,在方程中加入了高阶非线性项,并进行了箱体波浪压力的测量模型实验,以验证计算结果。计算模型将船体底面以下水域取为内域,其余水域为外域。内域用欧拉方程计算,外域采用Boussinesq方程。内外域在交界面处相耦合。数值计算结果与实验结果进行了对比,符合良好。该计算模型具有计算简单、速度快,能适应变化的地形的特点。

A nonlinear time-domain coupled numerical model is adopted in order to calculate the nonlinear wave forces acted on a box-shaped ship in harbor.A higher order nonlinear term is also included in the equations in order to extend the model to a fully nonlinear problem for shallower water waves.The whole domain is divided into an inner domain and an outer domain.The inner domain is the area beneath the ship hull,which is governed by the Euler equations.The outer area is the area between the ship and harbor walls,which is governed by the higher order Boussinesq equations.A relevant pressure physical experiment was conducted to validate the model,and a good agreement is obtained between the numerical results and the experimental data.The numerical computations of the model are simple and efficient,which is particularly useful for the computation of the non-linear wave forces on a ship in a harbor.