不规则波数值模拟精度影响因素分析  

Analysis of factors influencing the accuracy of numerical simulation of irregular wave

作　　者：吴明[1] 应荣熔[2] 蔡烽[1] 杨波[1] 王骁[1] WU Ming;YING Rong-rong;CAI Feng;YANG Bo;WANG Xiao(Department of Navigation,Dalian Naval Academy,Dalian 116018,China;Office of Academic Affairs,Dalian Naval Academy,Dalian,116018,China)

机构地区：[1]海军大连舰艇学院航海系,辽宁大连116018 [2]海军大连舰艇学院教务处,辽宁大连116018

出　　处：《舰船科学技术》2020年第9期75-81,共7页Ship Science and Technology

基　　金：十三五预研项目(41407010301)。

摘　　要：基于粘性流理论建立三维数值波浪水池,通过求解非定常RANS方程结合RNG k-ε湍流模型模拟流场,采用VOF方法模拟不规则波波面,通过在入口边界定义速度和波高产生入射波,生成基于ITTC谱的长峰不规则波,在数值波浪水池的末端设置阻尼销波区。在此基础上,分析网格尺寸、时间步长、欠松弛因子和频率等分数量4种因素对不规则波数值模拟精度的影响。最后给出不规则波数值模拟的建议,并验证了该模拟模式的有效性。A three-dimensional viscous numerical wave tank was established based on computational fluid dynamics(CFD)method.The Reynolds Averaged Navier–Stokes(RANS)equations and RNG k-εturbulence model were solved in the simulations.The wave surface was simulated by Volume of Fluid(VOF)method.A numerical approach of wave-generation method of defining inlet boundary conditions was employed,and the irregular waves of ITTC spectrum were generated.The outgoing waves are numerically dissipated inside an artificial damping zones located at the outlet boundary.On this basis,the Influencing factors of numerical simulation of irregular wave were analyzed on the aspect of mesh scale,time step,the under-relaxation factors and the number of sub-frequency.Finally,a recommendation for the simulation of irregular waves is provided,and the effectiveness of the present simulation method is verified.

关 键 词：计算流体动力学 数值水池 不规则波 影响因素 

分 类 号：U661.7[交通运输工程—船舶及航道工程]