数值波浪水池及顶浪中船舶水动力计算

基于粘流理论建立了三维数值波浪水池,模拟了非线性波浪,并对规则波顶浪中前进的拘束船模的水动力进行了计算.数值模拟中,控制方程-RANS方程和连续性方程使用有限体积法离散,非线性自由面采用VOF方法处理;在入口边界模拟柔性造波板运动产生入射波,使用位于波浪水池尾部的人工阻尼区消波.给出了非线性规则波的模拟结果以及规则波顶浪中前进的拘束船模的水动力计算结果,并与理论解及DUT(Delfi University of Technology)的试验数据进行了比较,二者吻合良好.

Computation of hydrodynamic forces for a ship in regular heading Waves by a viscous numerical wave tank

Numerical simulation of nonlinear waves and a restrained ship model advancing in regular heading waves inside a 3D viscous numerical wave tank (NWT) is carried out. The governing equations,Reynolds Averaged Navier-Stokes (RANS) and continuity equations are discretized by finite volume method (FVM). Volume of fluid (VOF) method is adopted to deal with the nonlinear free surface. The incident waves are generated from the inflow boundary by prescribing a velocity profile resembling flexible flap wavemaker motions,and the outgoing waves are dissipated inside an artificial damping zone located at the rear part of the wave tank. In this paper,the results for the generation of regular waves and computation for hydrodynamic forces of a restrained ship advancing in regular heading waves are presented. The results of numerical simulation are compared with theoretical results and experimental data from Delft University of Technology,and show good agreement with them.