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

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (23) : 270-277.

CHEN Weilin, JI Chunning, XU Dong

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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.

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small spacing ratio / two tandem cylinders / vortex-induced vibration / coupling mechanism

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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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