In this paper the numerical simulations of the flow around an elastically-mounted circular cylinder with one degree of freedom (1-DOF) with small damping parameter and small mass ratio are presented. The simulations are performed for subcritical Reynolds numbers ($2.0\cdot 10^3<\mathrm{Re}<1.3<10^4$), using the URANS (Unsteady Reynolds Averaged Navier Stokes) approach in combination with the SST (Shear Stress Transport) turbulence model. The simulations are carried out on 3D as well as 2D meshes. From the overall results it seems that the bi-dimensional approach could be effectively applied in the lower branch, while major discrepancies are present in the upper branch. The detailed analysis of the wake flow characteristics shows that the three dimensionality of the flow is stronger in the transition zones between the different branches. The extensive comparison between the computational simulations and the experimental results presented in this paper could be considered the “start point” in order to select the proper grid model depending on the requested accuracy.

本文给出了阻尼参数小，质量比小的一自由度（1-DOF）弹性圆柱体绕流的数值模拟。对亚临界雷诺数（$\mathrm{2个}。0\cdot \mathrm{1个}{0}^3<\mathrm{关于}<\mathrm{1个}。3<\mathrm{1个}{0}^4$），结合使用URANS（非稳态雷诺平均航向斯托克斯）方法和SST（剪切应力传递）湍流模型。模拟是在3D和2D网格上进行的。从总体结果来看，二维方法似乎可以有效地应用于下层分支，而较大的差异存在于上层分支中。对尾流特征的详细分析表明，在不同分支之间的过渡带中，流动的三维性更强。本文中提出的计算模拟与实验结果之间的广泛比较可以视为“起点”，以便根据要求的精度选择合适的网格模型。