随行波微结构表面圆柱涡激振动的抑振研究

Vortex-induced vibration suppression of circular cylinder with traveling wave micro-structure surface

涡激振动易诱发非流线型物体发生结构失稳或疲劳损坏,为抑制涡激振动而提出一种随行波微结构表面的方案。通过非定常流体数值计算方法求解分析雷诺数为10 000时普通表面圆柱和随行波微结构表面圆柱的振动特性。定义随行波微结构表面参数;采用Newmark-β法求解单自由度圆柱振动方程并编写CFD数值计算的UDF,计算采用k-ω/SST湍流模型和SIMPLEC算法,并结合动网格技术模拟圆柱的振动过程。研究结果表明:相比于普通表面的圆柱,随行波微结构表面圆柱具有较为显著的抑振效果,振动幅度减小约为92. 97%。本文研究结果可为柱体或管状结构涡激振动的抑振提供参考。

Vortex-induced vibration(VIV)easily causes structural instability or fatigue damage to non-streamlined structures.Considering this problem,a new scheme for VIV suppression of cylinders with traveling wave micro-structure surface is proposed in this paper.The VIV responses of cylinder with conventional surface and a cylinder with traveling wave micro-structure surface are analyzed by transient computational fluid dynamics(CFD),with Reynolds number of 10 000.The traveling wave micro-structure surface parameters are defined,and the Newmark-βmethod is used to solve the single-degree-of-freedom vibration equation of cylinder,and compile the user-defined function(UDF)for the CFD numerical calculation.The k-ω/SST turbulence model and SIMPLEC algorithm are applied in the calculation,and the vibration process of cylinder is simulated using the dynamic mesh technique.The results show that compared with the cylinder with conventional surface,the cylinder with a traveling wave micro-structure surface has a remarkable VIV suppression effect,and the amplitude is reduced by about 92.97%.The result of this study can provide references for VIV suppression of cylindrical or tubular structures.