Parametric optimization for vortex-induced vibration suppression of a single cylinder with two small cylinders symmetrically arranged in rear

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (3) : 24-29.

CHEN Weilin, JI Chunning, XU Dong, XU Xiaoli

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Abstract

Numerical simulations were done for vortex-induced vibration of a single cylinder with two small cylinders arranged in rear using the immersion boundary method based on iterative embedded form to optimize parameters of vortex-induced vibration suppression.Reynolds number and the diameter ratio of small cylinder to main one were Re=100 and d/D=0.125.The simulation results showed that the optimal control parameters are determined as follows: θ=25°, G/D=0.125, α=-2.2 and ζ=1.02 through changing control angle (θ ), gap ratio between small cylinder and main one (G/D), small cylinder’s rotating speed and rotating direction (α) and damping ratio (ζ); small cylinder’s rotating speed and rotating direction have a certain effect on main cylinder’s vibration amplitude; the inward counter-rotating (IC) can further suppress main cylinder’s vibration, while the outward counter-rotating (OC) has the opposite effect; main cylinder’s vibration amplitude firstly increases then decreases with increase in damping ratio, but its influence level is smaller.

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vortex-induced vibration / small cylinder / vibration control / mass ratio / damping ratio

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CHEN Weilin, JI Chunning, XU Dong, XU Xiaoli. Parametric optimization for vortex-induced vibration suppression of a single cylinder with two small cylinders symmetrically arranged in rear[J]. Journal of Vibration and Shock, 2020, 39(3): 24-29

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