Numerical simulation of wake-induced vortex vibration on two tandem square cylinders

被引：0
|
作者：
Du X.-Q. [1 ,2 ]
Qiu T. [1 ]
Zhao Y. [1 ]
机构：
[1] Department of Civil Engineering, Shanghai University, Shanghai
[2] Aerodynamic Flow Control Research Center, Shanghai University, Shanghai
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2020年 / 33卷 / 05期
关键词：
Numerical simulation; Soft-lock-in; Two tandem square cylinders; Wake flow structure; Wake-induced vibration;
D O I：
10.16385/j.cnki.issn.1004-4523.2020.05.013
中图分类号：
学科分类号：
摘要：
The aerodynamic interference between two square cylinders can lead to complicated flow-induced vibrations whose mechanisms have not been clarified yet. Numerical simulation methods are employed to study the variation of vibration amplitude, frequency, wake mode, etc. of the upstream and downstream square columns with deceleration speed, for the wake-induced vortex vibration of two identical elastically mounted square cylinders in the tandem arrangement at Re=150. The results indicate that the maximum amplitudes of the two tandem square cylinders in the transverse and the in-line direction are much larger than those of the single square cylinder. Furthermore, the maximum amplitude of the downstream square cylinder is larger than that of the upstream cylinder. Soft-lock-in phenomena occur when the amplitude of the upstream square cylinder reaches the maximum in the transverse direction, which is not observed in the single square cylinder. Five flow structures are identified within the entire range of the reduced velocity. It is worth noting that the flow structure is 2P mode when the transverse flow amplitude of the upstream square cylinder attains the maximum, parallel vortex street mode when the amplitude of the downstream square cylinder attains the maximum, and 2S mode when the amplitude of the downstream square cylinder remains large under the high reduction speed outside the 'soft lock' zone. © 2020, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.
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页码：985 / 993
页数：8
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