波高对波纹管涡激振动特性的影响研究

Impact of Wave Height on Vortex-Induced Vibration Characteristics of Wavy Cylinders

立管在海流作用下极易发生涡激振动问题,涡激振动是造成立管疲劳破坏的主要原因,因此工程上亟需抑制其涡激振动的措施。本文针对波纹管结构,研究其波高大小对涡激振动特性的影响规律。首先在Gambit建立二维网格模型,再使用Fluent进行波纹管绕流模拟,计算雷诺数约5000~60000,而后分析比较不同波高对波纹管涡激振动特性的影响。结果表明:波高对波纹管涡激振动特性有重要影响,波纹管涡激力随波高增加呈先增大再减小再增大趋势;而波高对涡泄频率影响较小,但波纹管结构的Strouhal数较普通圆柱要高。

Vortex-induced vibration(VIV)is very easy to occur in riser under the action of ocean current.VIV is the main cause of fatigue failure of riser.In this paper,the effect of wave height on the vortex-induced vibration characteristics of wavy cylinders is studied.First,a two-dimensional mesh model was built in Gambit,then the flow around the wavy cylinders were simulated by Fluent,and the Reynolds number was calculated from 5000 to 60000.The results show that the wave height has an important effect on the vortex-induced vibration of the wavy cylinders,and the vortex-induced force increases first and then decreases and then increases with the increase of the wave height,while the wave height has little effect on the vortex-induced vibration frequency,however,the Strouhal number of wavy cylinders structure is higher than that of ordinary cylinder.