Numerical study on the vortex-induced vibration of a rectangular cross section cylinder with different side ratios

被引：0
|
作者：
Zhu, Yuzhe [1 ]
Chen, Fubin [1 ]
机构：
[1] School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 10期
关键词：
amplitude ratio; aspect ratio; numerical simulation; reduced velocity; transient flow field; vortex-induced vibration;
D O I：
10.13465/j.cnki.jvs.2024.10.009
中图分类号：
学科分类号：
摘要：
The change of the side ratio (D/B) for a rectangular cross section cylinder will lead to the variation of the surrounding flow field, affecting the aerodynamic performance and vortex-induced vibration (VIV) response of the cylinder. Based on the Fluent platform, the effects of side ratio on the vortex-induced vibration of a two-dimensional rectangular cross section cylinder with Reynolds number 22 000 were studied by combinedly using the overset grid technology and the fourth-order Runge-Kutta method. Firstly, a rectangular section with the side ratio of D/B =0. 25 was selected, and the effectiveness of the simulation method and parameter setting was verified by comparing the calculated results with the results in relevant literature tests and simulations. Then, the effects of the side ratio on the VIV response of the rectangular cross section cylinder were compared and analyzed in of terms the statistical values of aerodynamic force coefficients, the self-spectrum, the amplitude changes in the flow and transverse direction, and the phase transition. Finally, the influence of different reduced velocity on the wake vortex shedding was analyzed from the respect of transient flow field. The results show that, when the section area of the cylinder is fixed, the VIV response of the cylinder with a small side ratio is very weak, and the aerodynamic performance is significantly lower than that of the cylinder with a large side ratio. The aerodynamic performance and VIV response of the cylinder with a large side ratio are higher than those of the standard square cylinder. The amplitude ratio of the cylinder may also change abruptly at a lower reduced velocity, but will reach the peak amplitude at a higher reduced velocity. Compared with the cylindrical structure, the vortex shedding mode of the rectangular cylinder with fixed separation angle is less sensitive to the change of the reduced velocity, which is more obvious on the large side ratiorectangular cylinder than the square cylinder. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：73 / 81
页数：8
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