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朱红钧, 钟家文, 宋金泽. 串列三圆柱流固耦合响应的尾流干涉与动态演变特性研究. 力学学报, 2024, 56(4): -. DOI: 10.6052/0459-1879-23-310
引用本文: 朱红钧, 钟家文, 宋金泽. 串列三圆柱流固耦合响应的尾流干涉与动态演变特性研究. 力学学报, 2024, 56(4): -. DOI: 10.6052/0459-1879-23-310
Zhu Hongjun, Zhong Jiawen, Song Jinze. Study on the wake interference and dynamic evolution characteristics of the fluid-structure interaction of three tandem circular cylinders. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(4): -. DOI: 10.6052/0459-1879-23-310
Citation: Zhu Hongjun, Zhong Jiawen, Song Jinze. Study on the wake interference and dynamic evolution characteristics of the fluid-structure interaction of three tandem circular cylinders. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(4): -. DOI: 10.6052/0459-1879-23-310

串列三圆柱流固耦合响应的尾流干涉与动态演变特性研究

STUDY ON THE WAKE INTERFERENCE AND DYNAMIC EVOLUTION CHARACTERISTICS OF THE FLUID-STRUCTURE INTERACTION OF THREE TANDEM CIRCULAR CYLINDERS

  • 摘要: 基于有限体积法应用开源OpenFOAM软件对串列三圆柱的涡激振动响应进行了数值模拟研究, 分析了雷诺数Re = 150、间距比介于2 ~ 6的串列三圆柱在约化速度2 ~ 16范围内的流固耦合动态响应特性. 研究观察到: 当间距比为2时, 上游圆柱振动锁定的区域明显变宽, 并且在锁定区域内振幅明显高于大间距工况, 表明小间距布置时, 下游圆柱的存在对上游圆柱振动起增强作用. 由于尾流诱导的作用, 中间圆柱和下游圆柱振幅的最大值高于上游圆柱. 串列三圆柱的尾流干涉模式存在拓展体模式、持续再附着模式、交替再附着模式、拟同脱落模式和同脱落模式5种, 并且由于圆柱振动过程中振幅的动态变化, 尾流干涉模式出现不稳定切换. 在间距比为2, 约化速度为7时观察到振动存在“拍”现象, 在间距比为6, 约化速度为4时观察到多频参与振动的大周期现象, 两种现象发生时都会引起柱体升力和振幅的波动. 当中间圆柱和下游圆柱的尾流干涉处于拟同脱落模式时, 尾迹中的双排涡合并形成二次涡街, 而双排涡的融合发生在同侧相邻的两个旋涡或3个旋涡之间, 与圆柱的间距比相关.

     

    Abstract: Based on the finite-volume-method (FVM), the vortex-induced vibration (VIV) of three tandem circular cylinders is numerically simulated using the open source OpenFOAM. The fluid-structure interaction and dynamic response characteristics are analyzed with Reynolds number Re = 150 in the spacing ratio range of 2 ~ 6 and reduced velocity range of 2 ~ 16. The results show that, when the spacing ratio is 2, the lock-in region of the upstream cylinder vibration becomes significantly wider than those at other spacing ratios, and the amplitude of the upstream cylinder in the lock-in region is significantly higher than the larger spacing ratio cases. It indicates that the vibration of the upstream cylinder is enhanced at small spacing-ratio arrangement. Due to the effect of wake-induced vibration, the maximum amplitude of the middle cylinder and the downstream cylinder are higher than that of the upstream cylinder. Five wake interference modes are identified, including the overshoot mode (OS), continuous reattachment mode (CR), alternate reattachment mode (AR), quasi-co-shedding mode (QCS) and co-shedding mode (CS). Nevertheless, due to the dynamic alteration of amplitude during the vortex-induced vibration process, the wake interference mode undergoes unstable switching. When the spacing ratio is 2 with the reduced velocity of 7, a "beating" phenomenon is observed in the response. When the spacing ratio is 6 with the reduced velocity of 4, a large periodic phenomenon is observed due to multiple frequencies participating in the vibration. Both the two phenomena cause the time-varying lift coefficient and response amplitudes of the cylinders. When the wake interference mode between the middle cylinder and the downstream cylinder presents the quasi-co-shedding pattern, the two-layered vortices in the wake merge to form the secondary vortex street. Such a merging occurs among two or three adjacent vortices on the same side, which is related to the spacing ratio of the cylinders.

     

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