On mechanisms of aerodynamic interference between two staggered circular cylinders at a high reynolds number

被引：0

作者：

Du, Xiao-Qing ^{[1
,3
]}

Wang, Yu-Liang ^{[1
]}

Zhao, Yan ^{[1
]}

Sun, Ya-Hui ^{[1
]}

Dai, Qin ^{[2
,3
]}

机构：

[1] Department of Civil Engineering, Shanghai University, Shanghai,200072, China

[2] Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai,200072, China

[3] Aerodynamic Flow Control Research Center, Shanghai University, Shanghai,200072, China

来源：

Gongcheng Lixue/Engineering Mechanics | 2018年 / 35卷 / 09期

关键词：

Flow structure - Lift - Drag - Circular cylinders - Reynolds number - Shear flow - Wind tunnels;

D O I：

10.6052/j.issn.1000-4750.2017.06.0443

中图分类号：

学科分类号：

摘要：

To clarify the mechanism of aerodynamic interference between two closely spaced staggered circular cylinders, a large eddy simulation (LES) method is adopted to investigate the flow structure and aerodynamics of the two cylinders at a high Reynolds number (Re=1.4×105). The ratio of center-to-center pitch (P) to the diameter of the cylinder is P/D=2. The correlations of aerodynamic coefficients between the two cylinders are analyzed, and the relationship between the aerodynamic forces and the flow structure is discussed as well. A new explanation is proposed for the mechanism of the large net lift on the downstream cylinder. It is revealed that the present numerical results are in a good agreement with those by a wind tunnel test. For small incidence angles (0°~10°), the downstream cylinder experiences a mean negative drag force, which is induced by the recirculation flow and the gap flow between the two cylinders. For the incidence angles of around 10°, the downstream cylinder is subject to a large mean lift, which is ascribed to the combined effects of three factors, i.e. the shift of stagnation point, the high-speed gap flow between the two cylinders, and the early separation and reattachment of shear layer of the downstream cylinder. © 2018, Engineering Mechanics Press. All right reserved.

引用

页码：223 / 231