单自由度刚性圆柱体绕流的不稳定性

发布时间：2018-01-07 05:37

本文关键词：单自由度刚性圆柱体绕流的不稳定性　出处：《江苏大学学报(自然科学版)》2016年01期 　论文类型：期刊论文

【摘要】：基于Open FOAM开源软件,利用k-ωSST湍流模型与6自由度(DOF)动网格模型,对亚临界区单自由度运动刚性圆柱绕流进行了三维数值模拟,研究了在不同初始流场下圆柱的阻力系数、升力系数、运动轨迹以及流固耦合的形态,并利用C++面对对象的编程与试验结果及理论分析作对比,验证所用湍流模型与三维模型的可靠性.计算结果表明:分块化结构网格与k-ωSST湍流模型对于圆柱绕流问题的计算结果比较准确,圆柱体在垂直来流方向的运动具有不稳定性,且其稳定性的强弱、运动偏离的方向与初始流场状态相关;由于流固的耦合作用改变了圆柱体受力的频率,加快了圆柱的偏移.
[Abstract]:Based on the Open FOAM open source software, the k- 蠅 SST turbulence model and the 6 degree-of-freedom (DOF) dynamic mesh model are used. Three-dimensional numerical simulation of the flow around a rigid cylinder with a single degree of freedom in the subcritical region is carried out. The drag coefficient, lift coefficient, motion trajectory and fluid-solid coupling pattern of the cylinder under different initial flow fields are studied. And the C face object programming and experimental results and theoretical analysis are compared. The reliability of the turbulence model and the three-dimensional model is verified. The results show that the block structured meshes and the k- 蠅 SST turbulence model are more accurate for the flow around a cylinder. The motion of the cylinder in the vertical direction is unstable, and its stability is strong or weak, and the deviation direction of the motion is related to the initial flow state. The coupling of fluid and solid changes the frequency of the cylinder and accelerates the displacement of the cylinder.
【作者单位】：江苏大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(11072091) 教育部科学技术研究重点项目(210078)
【分类号】：O357.5
【正文快照】： 引文格式:李昌烽,王力,王宏宇,等.单自由度刚性圆柱体绕流的不稳定性[J].江苏大学学报(自然科学版),2016,37(1):35-38.静止圆柱绕流是钝体绕流中最为经典的绕流问题.流体绕圆柱流动时,过流断面收缩,流速沿程增加,压强沿程减小,由于黏性力的存在,就会在柱体周围形成附面层分离,

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