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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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.

Key words： small spacing ratio two tandem cylinders vortex-induced vibration coupling mechanism

Received: 11 April 2017 Published: 28 November 2018

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	CHEN Weilin
	JI Chunning
	XU Dong

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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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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2018/V37/I23/270

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