双自由度涡激振动数值模拟方法研究  

Numerical simulation method for 2-DOF vortex-induced vibration

作　　者：孙丽萍[1] 张旭 倪问池 

机构地区：[1]哈尔滨工程大学深海工程技术研究中心,哈尔滨150001

出　　处：《振动与冲击》2017年第23期22-26,67,共6页Journal of Vibration and Shock

基　　金：国家工信部海洋工程装备科研项目(G014614002)

摘　　要：当前双自由度涡激振动数值模拟的研究模拟结果精度并不十分理想,尤其是对于最大振幅的响应的估计。在Jauvtis与Williamson的实验中,观测到低质量比圆柱的最大振幅可达1.5D,并将其命名为"超上端分支"。然而,当前研究很少有模拟结果能达到1.3D,甚至无法捕捉到超上端分支,其原因很可能是湍流模型本身的缺陷以及数值模拟参数设置的不合理。针对上述问题,基于开源软件OpenFOAM,采用了改进的k-ε湍流模型,研究了加速度对涡激振动响应的影响,优化了数值模拟方法。通过振幅、相位、轨迹、尾涡等响应的分析,证明在适当的加速度下,运用改进k-ε模型可对双自由度涡激振动实现较精确的数值模拟。The existing simulation results for 2-DOF vortex-induced vibration are not satisfied,especially,the maximum amplitude estimation of its responses. In tests of Jauvtis Williamson,the maximum amplitude of a cylinder with a low mass ratio could reach 1.5D,this phenomenon was named ＂super upper branch＂. But,few simulation results of current studies can reach 1.3D even unable to capture super upper branch. The reasons were likely to be defects of the turbulence model itself and the unreasonable setting of numerical simulation parameters. Aiming at the problems mentioned above,an improved k-ε turbulence model was used to study the effect of acceleration on responses of vortexinduced vibration here based on the software Open FOAM and optimize the numerical simulation method. By analyzing responses of amplitude,phase,trajectory and tail vortex,it was shown that 2-DOF vortex-induced vibration can be numerically simulated more accurately with the improved k-ε turbulence model under appropriate accelerations.

关 键 词：涡激振动 k-ε湍流模型 加速度 数值模拟 

分 类 号：U661.1[交通运输工程—船舶及航道工程]