不同湍流模型下圆柱涡激振动的计算比较  

Comparison between different turbulence models on vortex induced vibration of circular cylinder

作　　者：林琳[1] 王言英[1] 

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024

出　　处：《船舶力学》2013年第10期1115-1125,共11页Journal of Ship Mechanics

基　　金：国家"八六三"高技术研究发展计划赞助项目(2006AA09A104)

摘　　要：为应用计算流体力学的方法模拟圆柱体的涡激振动问题,文章采用有限体积法结合两种不同的湍流模型(RNG k-ε和SST k-ω湍流模型)求解时间平均的纳维尔—斯托克斯方程(RANS),对低质量比弹性支撑的刚性圆柱体在均匀来流中的的涡激振动问题进行了研究。计算对象参照Govardhan和Williamson的物理模型实验中的参数,通过比较两种湍流模型下圆柱体的振幅响应、频率响应及三个响应分支的水动力系数和尾涡模式,分析了两种湍流模型模拟结果的差异及原因,结果表明:RNG k-ε湍流模型和SST k-ω湍流模型的模拟结果差异很大,不论在振幅响应和频率响应上的计算上,还是对升力的谱分析上,SST k-ω模型的计算结果都更接近于真实的物理现象,并且采用SST k-ω湍流模型成功地模拟出了2P模式。因此从整体上说,SST k-ω湍流模型的模拟效果要优于RNG k-ε湍流模型。In order to apply Computational Fluid Dynamics to solve vortex induced vibration problem, RNG k-ε and SST k-w turbulence models are adopted to predict transverse vortex induced vibration of elasti cally supported rigid cylinder with low mass damping in a fluid flow. Experiment by Govardhan ＆ Williamson is taken as reference. By comparing the peak amplitude, response frequency and hydrodynamic coefficients as well as wake modes of three different response branches at two different turbulence models, analysis of differences between two turbulence models are presented. Results indicate that there exist signif icant differences between two turbulence models. In terms of advantages on the simulation of amplitude re sponse, frequency response, spectral analysis of lift force and 2P vortex mode, SST k-w model is better than RNG k-ε model on the whole.

关 键 词：涡激振动 计算流体力学 RNG k-ε湍流模型 SSTk-w湍流模型 

分 类 号：U671.5[交通运输工程—船舶及航道工程]