不同剪切率来流作用下柔性圆柱涡激振动数值模拟

及春宁; 花阳; 许栋; 邢国源; 陈威霖

doi:10.6052/0459-1879-17-222

不同剪切率来流作用下柔性圆柱涡激振动数值模拟

doi: 10.6052/0459-1879-17-222

天津大学水利安全与仿真国家重点实验室,天津 300072

基金项目: 国家自然科学基金项目(51579175);天津市应用基础与前沿技术研究计划项目(12JCQNJC02600);NSFC-广东联合基金（第二期）超级计算科学应用研究专项资助(U1501501);国家超级计算广州中心支持.

详细信息

作者简介:
通讯作者: 许栋(1980―),男,山东人,副教授,博士,主要从事流固耦合、涡激振动、泥沙运动研究(E-mail: xudong@tju.edu.cn).

作者简介：及春宁(1978―),男,河北人,教授,博士,主要从事流固耦合、涡激振动、泥沙运动研究(E-mail: cnji@tju.edu.cn)

通讯作者:
许栋

中图分类号: P751,TB531;
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出版历程
- 收稿日期: 2017-06-15
- 刊出日期: 2018-01-18

Numerical simulation of vortex-induced vibration of a flexible cylinder exposed to shear flow at different shear rates

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China

摘要

摘要: 采用浸入边界法对细长柔性圆柱在线性剪切流条件下的涡激振动进行三维数值模拟。细长柔性圆柱振动采用三维索模型模拟,其两端铰接,质量比为6,长细比为50,无量纲顶张力为496。来流为线性剪切流,剪切率从0到0.024变化,最大雷诺数为250。研究发现：剪切流作用下柔性立管横流向振动表现为驻波模式,而顺流向振动表现为行波-驻波混合模式。随着剪切率增大,振动频谱呈现多频响应,振动能量逐渐向低频转移。阻力系数平均值随着展向变化,脉动阻力系数和升力系数的均方根值均表现为“双峰”模式。流固能量传递系数沿立管轴向的分布表明,振动激励区集中于高流速区,而振动阻尼区多位于低流速区。剪切率较小时,圆柱的泻涡为平行交叉模式;剪切率较大时,圆柱的泻涡为倾斜泻涡模式,且由于泻涡频率沿立管轴向变化,尾流发生涡裂现象,形成泻涡频率不同的胞格结构。
- 柔性圆柱 /
- 涡激振动 /
- 剪切流 /
- 流固能量传递 /
- 涡裂
Abstract: In this paper, the immersed boundary method was used to simulate the vortex-induced vibration of a slender flexible cylinder exposed to linear shear flows. The vibration of the cylinder was simulated by using a three-dimensional cable model pinned at both ends. The cylinder has a mass ratio of 6 and an aspect ratio of 50. The normalized top tension is 496. The incoming flow has different linear velocity profiles with the shear rates ranging from 0 to 0.024. The maximum Reynold number is 250. It was found that the transverse vibration shows a standing wave pattern while the streamwise vibration shows a combined traveling-standing wave pattern. With the increase of the shear rate, the distribution of Power Spectrum Density (PSD) of vibration responses shows a multi-frequency mode, and the vibration energy shifts to low frequency bands. The mean drag coefficient varies in the spanwise direction while the root-mean-square (RMS) values of fluctuating drag and lift coefficients show a two-peak pattern. The distribution of the fluid-solid energy transferring coefficient indicates that the vibration-exciting region coincides with the high-velocity region while the vibration-damping region matches the low-velocity region. For the cases with low shear rates, the vortex-shedding behind the cylinder shows the interwoven pattern. However, for the cases with large shear rates, the vortex-shedding displays the oblique pattern. Due to the spanwise variation of the vortex-shedding frequency, the vortex-splitting occurs in the near-wake, leading to the vortex cells with different vortex-shedding frequencies.
- flexible cylinder /
- vortex-induced vibration /
- shear flow /
- fluid-solid energy transfer /
- vortex splitting

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参考文献(1)

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