Effects of Reynolds number and surface modification on wake-induced vibrations of two staggered circular cylinders

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL Journal of Wind Engineering and Industrial Aerodynamics Pub Date : 2024-10-09 DOI:10.1016/j.jweia.2024.105912

Thu Dao, Hisato Matsumiya, Kyohei Noguchi, Gabriel Mohallem, Runze Xu, Tomomi Yagi

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Abstract

This study explores the role of Reynolds numbers (Re) in wake-induced vibrations (WIVs) of two cylinders, specifically wake galloping and two-degree-of-freedom coupled flutter on the downstream cylinder. The center-to-center distances between the cylinders were 3.0D −5.0D in along-flow direction and 0.0D −2.0D in cross-flow direction (D is the diameter of the cylinders). The Re ranged from 1.4 × 10⁴–6.7 × 10⁴, within the subcritical Re regime of a smooth cylinder. The supercritical Re regime was realized by winding 12 spiral protuberances along the cylinders to lower the critical Re. Descriptions of wake interference of two smooth cylinders at Re = 850–6.5 × 10⁵ were summarized from the literature. Wake interference strongly depended on Re, even within the subcritical Re regime. WIVs mostly occurred in the upper subcritical Re regime with strong wake interference. In the supercritical Re regime, the wakes of the cylinders were narrowed and vortex shedding was suppressed. Consequently, the wake interference and WIVs were weakened or completely disappeared. The cylinders fitted with 12 spiral protuberances reportedly reached the supercritical Re regime at Re = 3.1 × 10⁴. Resultantly, they were stable against WIVs above this Re even at close spacing, and suitable for stay cable applications.

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雷诺数和表面改性对两个交错圆筒的唤醒振动的影响

本研究探讨了雷诺数（Re）在两个气缸的尾流诱导振动（WIVs）中的作用，特别是下游气缸上的尾流奔腾和两自由度耦合扑腾。圆筒之间的中心到中心距离在顺流方向为 3.0D -5.0D，在横流方向为 0.0D -2.0D（D 为圆筒直径）。Re 值范围为 1.4 × 104-6.7 × 104，属于光滑圆柱体的亚临界 Re 值范围。通过沿圆柱体缠绕 12 个螺旋突起来降低临界 Re 值，从而实现了超临界 Re 值。从文献中总结了两个光滑圆柱体在 Re = 850-6.5 × 105 条件下的唤醒干扰。即使在亚临界 Re 条件下，唤醒干涉也与 Re 密切相关。WIVs 主要发生在具有强烈唤醒干涉的亚临界 Re 上层。在超临界 Re 状态下，圆柱体的湍流变窄，涡流脱落受到抑制。因此，唤醒干扰和 WIV 被减弱或完全消失。据报道，装有 12 个螺旋突起的圆筒在 Re = 3.1 × 104 时达到了超临界 Re 状态。因此，即使在间距很近的情况下，它们也能稳定地抵御高于此 Re 值的 WIV，适用于留缆应用。

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来源期刊

Journal of Wind Engineering and Industrial Aerodynamics 工程技术-工程：土木

CiteScore

8.90

自引率

22.90%

发文量

306

审稿时长

4.4 months

期刊介绍： The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.