&nbsp;Numerical Simulation Research on Two Separate Vortex-Induced Vibration Lock-in of the Bridge Decks

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (11) : 47-53.

Numerical Simulation Research on Two Separate Vortex-Induced Vibration Lock-in of the Bridge Decks

HUANG Li 1, ZHOU Shuai 2, LIANG Peng 2

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Abstract

For some large aspect ratio bridge decks or similar bluff bodies, two separate vortex-induced vibration lock-in of the same DOF can be observed in the same section model wind tunnel tests, and the dominant oscillating frequencies of the two lock-in are the same, which is against the traditional Strouhal law. In order to get a further understanding on aerodynamic mechanisms of these oscillations, a rectangular cylinder whose aspect ratio is 6 is taken as research object, and based on its 2D section model wind tunnel tests parameters and results, the Fluent based numerical simulations are performed. The simulation results have a good agreement with experimental results not only on lock-in range but on amplitude response, then after, more details about aerodynamic forces and wake vortices are obtained by the post processing of Fluent. The study show that, the wake vortices of the first VIV lock-in is the typical Karmen vortex mode, while the second one is rather different from the first one, the wake vortices are observed to be “fish tail waving” mode; in the two separate lock-in, there is always a phase difference between aerodynamic lift and vertical displacement response, and the phase difference is continuously increasing until the end of lock-in, moreover, the jump of phase difference of the first lock-in is more serious than the second one.

Key words

bridges / vortex-induced vibration / lock-in / numerical simulation / wake vortices

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HUANG Li 1, ZHOU Shuai 2, LIANG Peng 2. Numerical Simulation Research on Two Separate Vortex-Induced Vibration Lock-in of the Bridge Decks[J]. Journal of Vibration and Shock, 2016, 35(11): 47-53

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