横流向热浮升力对并列双圆柱流致振动的影响

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摘要本文采用浸入边界法对横流向热浮升力作用下并列双圆柱的流致振动进行了数值模拟研究，详细总结了理查森数Ri = 3条件下并列双圆柱的最大振幅、时均位移、升阻力系数、频率特性和尾流模式等随间距比及折合流速的变化规律。研究发现：横流向热浮升力作用下，并列双圆柱振幅和升、阻力系数呈现不对称特点，振动响应除了出现涡激振动，在更高折合流速下出现了驰振。圆柱振动平衡位置相对其初始位置均发生与热浮升力反向的偏移，偏移量随折合流速增大而增加。在涡振阶段，并列双圆柱尾流场表现出稳定的宽窄尾流模式，两个圆柱的泄涡基本保持反相同步；在驰振阶段，尾流场表现为同相同步模式，圆柱的振动响应出现了倍频锁定现象。

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	俞华锋1
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	孙震洲1
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	王义瑄3
	及春宁1
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关键词 ：热浮升力, 并列双圆柱, 涡激振动

Abstract：In this paper, the flow-induced vibration of two side-by-side cylinders under the action of cross-flow thermal buoyancy is numerically simulated by using the immersed boundary method. The maximum vibration amplitude, time-mean displacement, lift and drag coefficients, frequency characteristics and the wake patterns of the cylinders varying with the spacing ratio and the reduced velocity are studied in detail with the Richardson number of Ri = 3. It is found that the amplitude, lift and drag coefficients of the side-by-side cylinders are non-identical under the action of thermal buoyancy. Besides the vortex-induced vibration, galloping appears at higher reduced velocities. The balanced position of the cylinders is inversely offset with regard to the direction of the thermal buoyancy, relative to its initial position, and the offset increases with the increase of reduced velocity. In the vortex-induced vibration, the wake shows the stable wide-narrow pattern, with the vortex shedding of the two cylinders being anti-phase synchronized. In the galloping, the wake displays the in-phase synchronized pattern while the vibration response of the cylinders shows the superharmonic lock-in phenomenon.

Key words： thermal buoyancy side-by-side cylinders vortex-induced vibration;

收稿日期: 2022-07-12 出版日期: 2023-07-15

引用本文:

俞华锋1,2，孙震洲1,2，王义瑄3，及春宁1,3. 横流向热浮升力对并列双圆柱流致振动的影响[J]. 振动与冲击, 2023, 42(13): 58-65.
YU Huafeng1,2, SUN Zhenzhou1,2, WANG Yixuan3, JI Chunning1,3. Effects of crossflow thermal buoyancy on flow-induced vibration of side-by-side cylinders. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(13): 58-65.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I13/58

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