基于CFD的船舶斜浪三自由度运动仿真研究

摘要

针对船舶在斜浪中的多自由度耦合运动问题,建立了三维粘性流耐波性数值波浪水池,采用边界条件造波法生成高精度的斜向规则波,通过同时求解RANS方程和刚体运动学方程,结合网格整体移动方法和滑移网格方法,实现了船舶斜浪航行的垂荡、纵摇及横摇三自由度耦合运动数值模拟.给出了DTMB5512船模斜浪中的垂荡、纵摇及横摇的频率响应函数,与线性切片理论计算结果进行比较,吻合良好.该方法可为船舶斜浪航行的耐波性预报提供一种有效的途径.%This paper established a 3D viscous numerical seakeeping wave tank for solving the ship motions with multi-degree of freedom in oblique wave.This method defined the inflow boundary conditions to generate high precision oblique regular waves.To predict the motions of ship in oblique regular waves,it solved the Reynolds averaged navier-stokes(RANS)equations and the kinematics equations of rigid body simultaneity,and used moving grid method together with sliding grid technique during the simulation.On this basis,it carried out a group of simulations and obtained the heave,pitch and roll transfer functions for ship model DTMB5512.The simulation results show good agreement with linear strip theoretical results,which demonstrate the present research can provide an effective way to predict ship's seakeeping characteristics in oblique waves.