Study on flow characteristics of three tandem circular cylinders at a subcritical Reynolds number

被引：0
|
作者：
Tu J.-H. [1 ,2 ]
Wang C. [1 ,3 ]
Liang J.-Q. [1 ]
Deng X.-H. [1 ,2 ]
Guo X.-G. [1 ,2 ]
Zhang P. [1 ]
机构：
[1] College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan
[2] Hunan Key Laboratory of Geomechanics and Engineering Safety, Xiangtan
[3] Yongzhou Lingling Financial Investment Assessment Center, Yongzhou
来源：
Chuan Bo Li Xue/Journal of Ship Mechanics | 2021年 / 25卷 / 09期
关键词：
Fluid force; Spacing ratio; Subcritical Reynolds number; Tandem three circular cylinders; Wake characteristic;
D O I：
10.3969/j.issn.1007-7294.2021.09.004
中图分类号：
学科分类号：
摘要：
Based on Fluent, three-dimensional numerical simulation for the three circular cylinders in tandem at Re=3 900 was carried out by using the large eddy simulation (LES) method of Smagorinsky sub-grid model in this paper. Firstly, the accuracy of the model and parameters was verified by solving a single cylinder. Then, the influence of spacing ratio on the flow characteristics of three circular cylinder groups was analyzed. The numerical results show that three forms of shear layer are observed, such as reattachment, roll reattachment and without reattachment with the increase of spacing ratio. Meanwhile, the first roll position of wake vortex also gradually moves upstream. On the other hand, the shape of the average velocity distribution in the inline direction in the cylinder wake region changes from "U" to "V". However, in the cross flow direction, the average velocity distribution is anti-symmetric in the near wake region, and the anti-symmetric feature weakens in the far wake region. The fluid forces of the three circular cylinders in tandem are mutated in the range of L/D=4.1~4.2. And the average drag coefficients of the upstream and midstream circular cylinders increase at L/D=4.2, which is similar to the two circular cylinders in tandem. However, the average drag coefficient of the downstream circular cylinder decreases. Finally, the primary frequencies of lift coefficient of the three tandem circular cylinders are basically the same, and increase with the increase of spacing ratio. © 2021, Editorial Board of Journal of Ship Mechanics. All right reserved.
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页码：1159 / 1171
页数：12
相关论文
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