Wake patterns of freely vibrating side-by-side circular cylinders in laminar flows

被引:32
|
作者
Chen, Weilin [1 ]
Ji, Chunning [1 ,2 ]
Xu, Dong [1 ]
Srinil, Narakorn [3 ]
机构
[1] Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China
[2] Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China
[3] Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
基金
中国国家自然科学基金;
关键词
Vortex-induced vibration; Circular cylinder; Side-by-side arrangement; Wake pattern; Fluid-structure interaction; Computational fluid dynamics; VORTEX-INDUCED VIBRATION; PAIR;
D O I
10.1016/j.jfluidstructs.2019.02.013
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Wake patterns behind two freely vibrating circular cylinders in side-by-side arrangements are numerically investigated through two-dimensional computational fluid dynamics simulations. The two cylinders, with an equal diameter and a low mass ratio (the cylinder mass/the displaced fluid mass) of 2, can only oscillate in the transverse direction, and they are subject to the uniform laminar flows with the Reynolds number of 100. The center-to-center spacing over a cylinder diameter ratio (s/D) is varied from 2 to 5. For each s/D, the reduced velocity U-r (defined by U-infinity/f(n)D, where U-infinity is the free-stream velocity and f(n) is the cylinder natural frequency) is varied from 0 to 30. A small parametric increment of Delta U-r = 0.1 and Delta s/D = 0.1 is considered, providing a comprehensive analysis and insights into the wake patterns of the vortex shedding behind both cylinders. With more than 1500 new simulation cases, 8 distinctive wake patterns are identified through a map of U-r and s/D, with several well-defined boundaries governing different flow patterns. Qualitatively distinctive wake characteristics are analyzed through the evaluations of vortex dynamics, hydrodynamic lift/drag forces and cylinder vibration responses. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:82 / 95
页数:14
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