Numerical simulation of flow around two staggered three-dimensional wavy conical cylinders

被引：0
|
作者：
Zou L. [1 ]
Liu J. [1 ]
Wu W. [1 ]
Yan Y. [1 ]
Wei Y. [1 ]
机构：
[1] School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan
来源：
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | 2022年 / 54卷 / 01期
关键词：
Flow structure; Large eddy simulation; Lift and drag characteristic; Stagger angle; Wavy conical cylinder;
D O I：
10.11918/202107056
中图分类号：
学科分类号：
摘要：
In this paper, the lifting and drag characteristics, flow field structure and wake interference effects of two staggered wavy conical cylinders with center-to-center pitch ratios of L/Dm=4 and 5 and staggered angles of α=0~15° at Reynolds number 3900 are studied by large eddy simulation. The results show that the trailing vortex of the upstream wavy conical cylinder curls up and impacts on the side of the downstream wavy conical cylinder, which causes periodic coupling force on the surface of the downstream wavy conical cylinder, resulting in the increase of the fluctuating lift coefficient. At α=10° the fluctuating lift coefficient is 20.1 times and 21.4 times higher than that of single straight cylinder, respectively. Under the influence of two free ends of the upstream wavy conical cylinder and the backflow area generated by the interaction between the upstream wavy conical cylinder and the downstream wavy conical cylinder, the time-average drag coefficient of the downstream wavy conical cylinder is significantly reduced, and with the increase of the staggered angle, the time-average drag coefficient of the downstream wavy conical cylinder gradually approaches that of the upstream wavy conical cylinder. At α=10°, the time-average drag coefficient is 34.9% and 18.8% lower than that of a single cylinder, respectively. The flow around the staggered double wavy conical cylinders shows the flow structures of complete impact, side impact and wake disturbance et al. Because of the shape of the wavy conical cylinder, the flow field passing through the wavy conical cylinder presents strong three-dimensional characteristics, and the trailing vortex has obvious stratification, and the side impact condition provides a larger fluctuating lift coefficient than the other two. The results in this paper can provide theory support for the array layout of wind floating structure. © 2022, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.
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页码：163 / 170
页数：7
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