输电塔钢管构件涡激振动数值模拟

Numerical Simulation of Vortex-Induced Vibration of Steel Tubular Members in Transmission Tower

用数值模拟方法对钢管构件涡激振动现象进行研究,分别进行了静止圆管绕流数值模拟以及弹簧支撑单自由度圆管绕流数值模拟.结果表明:静止圆管计算工况雷诺数介于20 000~35 000之间,升力系数幅值以及阻力系数均值的平均值分别为1.427和1.273,与前人试验结果较为吻合;涡街形成的决定性因素是物体后部两个分离剪切层的相互作用;发生涡激振动时,顺风向响应要远小于横风向响应;基于单自由度模型进行动网格分析,给出了最大位移比公式以及线性插值关系式,将二维数值模拟应用于三维钢管构件的涡振疲劳分析.

A numerical simulation of still circular tube and dynamic single-degree-of-freedom （SDOF） circular tube was performed to study the vortex-induced vibration （VIV）. The results show that in still case between the Reynolds number of 20k to 35k, the mean value of lift and drag coefficient amplitude are 1. 472 and 1. 273, respectively, which are in consistent with previous experimental investigations. The formation of vortex-street is determined by the interference of the shear layers. The along-wind response is far less than across-wind response during VIV. Based on the feasible SDOF model with dynamic mesh and relevant formulas, the 2D simulation is applied to fatigue analysis of 3D steel tubular members.