【作者】 王建华； 万德成；

【Author】 WANG Jian-Hua;WAN De-Cheng;Computational Marine Hydrodynamics Lab (CMHL),State Key Laboratory of Ocean Engineering,School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University;

【机构】 上海交通大学船海计算水动力学研究中心(CMHL)船舶海洋与建筑工程学院海洋工程国家重点实验室；

【摘要】 目前船舶水动力学领域中针对高航速船舶的艏波破碎研究较少,本文针对国际标准船模KCS,开展基于CFD方法的数值模拟研究。船模长度为6.0702m,计算中工况选择破波现象较为明显的航速Fr=0.35,并且分别考虑正浮状态和1°纵倾两个工况。数值模拟采用CMHL研究团队基于开源OpenFOAM平台自主开发的船舶水动力学求解器naoe-FOAM-SJTU,流场求解采用非定常不可压的两相流RANS方法,自由面采用带人工压缩项的流体体积法(VOF)进行捕捉。为了精确捕捉艏部兴波破碎特征,在艏部破波区域对计算网格和对应的数值格式进行了特殊处理。通过数值计算得出了船舶在不同纵倾下的阻力和兴波,正浮状态下的阻力结果与实验进行了对比,误差小于3%,验证了采用当前数值模拟手段进行船首波破碎预报的可靠性。根据数值结果发现1°纵倾工况下的破碎波现象更为显著。此外,当前数值计算还给出了不同剖面处的兴波波高变化,以及自由面破碎波附近的涡量场,分析了纵倾变化对艏部破波的影响机理。更多还原

【Abstract】 So far,ship breaking wave at high speed has been barely studied.This paper focus on numerical simulations of the benchmark ship model KCS with length of 6.0702 m.The ship speed is Fr=0.35 and two conditions,i.e.0 deg and 1 deg trim angle are considered.Self-developed solver naoe-FOAM-SJTU is applied for all the numerical computations.RANS approach coupling with VOF method is used to calculate the viscous flows around the ship.In order to accurately capture the breaking waves,grids at breaking wave region have been refined.The total resistance can be well predicted with error lower than 3%.It is found that the breaking phenomenon is stronger at 1 deg trim condition.Free surface and vortex distribution around the breaking wave region are presented to illustrate the hydrodynamic performance at different trim conditions.更多还原