小间距比下串列双圆柱涡激振动数值模拟研究：尾流和耦合机制

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (23) : 270-277.

论文

陈威霖，及春宁，许栋

作者信息 +

Numerical simulations for VIV of two tandem cylinders with small spacing ratios: wake flow and interaction mechanism

CHEN Weilin, JI Chunning, XU Dong

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文章历史 +

摘要

对小间距比( )下串列双圆柱涡激振动的尾流和耦合机制进行了全面的研究，其中雷诺数为。两圆柱均仅作横向振动。对尾流的研究发现，当间距比时，小折合流速时对应经典的卡门涡街，而折合流速较大时，尾流则变得混乱起来，难以分辨其模式。当间距比时，尾流均为规律的2S模式。耦合机制分析发现，串列双圆柱平衡位置差的变化促成了在间距比时广折合流速响应的存在；而多频成分参与的不稳定耦合作用成为在间距比时类尾流弛振现象的诱因；大振幅响应在间距比时得以持续的动力则源于上游圆柱脱落旋涡产生的低压区和下游圆柱低频的运动。此外，一种新的平衡位置间歇跳跃现象在间距比和折合流速时出现，且响应在上侧的新平衡位置能稳定更长的时间。

Abstract

A detailed investigation was performed for VIVs of two tandem cylinders to analyze wake flow and interaction mechanism.The results showed that when L*=1.1—1.3,the classical Karman vortex street exists at small reduced flow velocities,while wake flow gets confused at larger reduced flow velocities; when L*=1.5,wake flows are regular 2S modes; when L*=1.1,the variation of equilibrium position difference of two tandem cylinders makes vibration responses exist under wider reduced flow velocities; when L*=1.2—1.3,the unsteady interactions with multi-frequency components participated induce quasi-wake relaxation vibration appearing; when L*=1.1,the low pressure region produced by shedding vortex of upstream cylinder and low-frequency motion of downstream cylinder are the dynamic sources to sustain large amplitude vibration responses; when L*=1.1 and Ur=15,a new intermittent jumping phenomenon of equilibrium position of two cylinders occurs,and the response can last longer time at the new equilibrium position on upper side.

导出引用

陈威霖，及春宁，许栋. 小间距比下串列双圆柱涡激振动数值模拟研究：尾流和耦合机制[J]. 振动与冲击, 2018, 37(23): 270-277

CHEN Weilin, JI Chunning, XU Dong. Numerical simulations for VIV of two tandem cylinders with small spacing ratios: wake flow and interaction mechanism[J]. Journal of Vibration and Shock, 2018, 37(23): 270-277

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