VLEC液舱晃荡与船体水动力耦合效应的数值求解  

Numerical Solution of VLEC Hydrodynamic Response Coupled with Tank Sloshing

作　　者：周清华[1] 胡可一[1] ZHOU Qing-hua;HU Ke-yi(Jiangnan Shipyard(Group)Co.,Ltd.,Shanghai 201913,China)

机构地区：[1]江南造船(集团)有限责任公司,上海201913

出　　处：《船舶力学》2021年第12期1664-1674,共11页Journal of Ship Mechanics

基　　金：工业和信息化部高技术船舶科研项目(工信部联装[2013]412号)。

摘　　要：本文以设有4个棱形B型独立液货舱的98 000 m3超大型乙烷运输船(VLEC)为例,研究了液舱晃荡和船体运动的水动力耦合效应的数值求解方法,其中主要考虑了晃荡效应对附加质量、阻尼系数和回复刚度的影响,不计及波面翻卷和破碎等强非线性因素。采用三维线性势流理论计算船体外流场(波浪运动)和液舱内流场(流体晃荡),在频域内求解液舱晃荡与船体运动的耦合运动方程,对是否考虑晃荡效应两种情况下船体运动的传递函数和剖面载荷的长期预报极值进行了对比分析。同时,以船体最大横摇运动响应时的等效设计波作为激励输入,运用计算流体动力学方法计算液舱三维晃荡运动特性和晃荡冲击压力。计算结果可为VLEC的总体性能评估和B型舱的结构安全评估提供参考。The coupling effects of tank sloshing on the ship motion and wave-induced loads of a verylarge ethane carrier(VLEC) with a loading capacity of 98 000 m3 and four prismatic independent TypeB cargo tanks are systematically investigated. The ship motion equation coupled with tank sloshing iscalculated in frequency domain based on the three-dimensional linear potential flow theory. The add-ed mass, damping coefficient and restoring stiffness correction due to tank sloshing are fully consid-ered. The response amplitude operators(RAO) of ship motion and sectional loads with and withoutconsidering tank sloshing are obtained. Taking the equivalent design wave determined from the maxi-mum RAO of roll as excitation input condition, the three-dimensional fluid sloshing movement behav-ior and sloshing-induced impact pressure are simulated by the computational fluid dynamics(CFD)method. The renormalized group(RNG) k-ε turbulence model is selected based on the Reynolds-Av-eraged Navier-Stokes(RANS) equation, and the volume of fluid method is adopted to predict the freesurface elevation. The results can provide a valuable reference for the overall design and structuralsafety assessment of VLEC.

关 键 词：VLEC 船体运动 液舱晃荡 耦合效应 频域分析 VOF法 

分 类 号：U661.32[交通运输工程—船舶及航道工程]