浅水效应对船舶阻力及流场特性的影响分析

摘要

为了分析浅水条件下船舶阻力及流场的特点,本文基于混合网格技术,结合Reynolds average numerical simulation(RANS)方法,对标准船模KRISO Container Ship (KCS)开展了船模浅水效应的数值预报分析.KCS船的船艉部分使用了三种不同的非结构网格划分方法,与水池试验值对比得到恰当的网格划分方法.通过改变数值水池高度探究水深变化对于船舶阻力及流场特性的影响.研究发现:当水深h小于10倍吃水时,KCS船浅水效应明显,随着水深的减小,船舶阻力系数、z方向抽吸力以及桨盘面伴流分数均呈增大趋势;随着水深的减小,艏艉压力差逐渐增大,船艉倾现象更加明显.%To analyze the characteristics of ship resistance and flow field in shallow water,we adopted a hybrid grid combined with the Reynolds-averaged Navier-Stokes (RANS) method and used the KRISO container ship (KCS) model in shallow water to perform numerical prediction and analysis.We adopted three unstructured grid methods to determine the most appropriate stern mesh generation method.By changing water depth,we analyzed the effect of water depth on the hydrodynamic performance of the ship.The results show that the shallow-water effect is distinct when the water depth h is less than 10 times the draft.With a decrease in water depth,the ship resistance coefficient,the suction force in the z direction,and the propeller flow fraction show increasing trends.With the decrease of water depth,the pressure difference between the head and the tail increases gradually,and the tail inclination is more obvious.