Numerical study on wake galloping of tandem circular cylinders considering the effects of mass and spacing ratios

被引：31

作者：

Li, Tian ^{[1
,2
]}

Ishihara, Takeshi ^{[2
]}

机构：

[1] Chongqing Univ, Sch Civil Engn, Chongqing 400044, Peoples R China

[2] Univ Tokyo, Sch Engn, Dept Civil Engn, Tokyo 1138656, Japan

来源：

JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS | 2021年 / 210卷

关键词：

Tandem circular cylinders; LES turbulence Model; Mass ratio; Spacing ratio; Helical wires; Critical velocity of wake galloping;

D O I：

10.1016/j.jweia.2021.104536

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The mass and spacing ratios of parallel circular cylinder structures change over a wide range in engineering applications. In this study, the effects of mass ratio, spacing ratio and helical wires on the wake galloping of tandem circular cylinders are investigated by LES turbulence model at the subcritical Reynolds number regime. The upstream cylinder is fixed and the downstream one is free to respond in the transverse direction. The characteristics of wake galloping of tandem circular cylinders are systematically studied for the cases of mass ratios m* = 1.8, 200 and spacing ratios x(0)/D = 4, 8 and 12. A critical velocity of wake galloping is derived as a function of mass ratio and lift coefficient slope using a wake-stiffness-based model. The suppression of wake galloping by the 4-start helical wires is examined and the maximum amplitude of vibration is found to decrease by 63% because of the positive added damping generated by helical wires.

引用

页数：15

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