中文摘要：

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.

英文摘要：

Based on OpenFOAM software with k-ω SST turbulence model and 6 degree-of-freedom motion grid solver, three-dimension numerical simulations were conducted for a flow of subcritical region around one degree of freedom moving cylinder. The cylinder lift coefficient, drag coefficient, motion trajectory and flow solid coupling pattern were investigated under different initial flow fields. Using C ＋ ＋ object oriented programming, the experimental data and theoretical analysis were compared to verify the reliability of the turbulence model and the calculation results. The calculation results show that structured mesh decomposition method and k-to SST turbulence model are accurate to solve the problem of flow around a circular cylinder. The cylinder with the freedom perpendicular to the flow direction is unstable. The stability strength and the deviating direction are related to the initial flow state. The fluid solid coupling changes the frequency of lift coefficient and enhances the cylinder deviating