桥梁断面两个涡振锁定区间的数值模拟研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (11) : 47-53.

论文

桥梁断面两个涡振锁定区间的数值模拟研究

黄俐1，周帅2，梁鹏3

作者信息 +

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

HUANG Li 1, ZHOU Shuai 2, LIANG Peng 2

Author information +

文章历史 +

摘要

对于某类大宽高比桥梁断面或者钝体形式断面，在基于同一组试验参数的节段模型风洞试验中，能够实测到相同振型两个分离的涡振锁定区间现象，并且两个区间内振动频率一致，这与一个断面对应一个Strouhal数的理论不相符合。为了进一步研究这类非常规振动形式的气动机理，以一组宽高比为6的矩形断面为研究对象，基于风洞试验中实测的两个独立的涡振锁定区间响应数据，采用流体动力学软件Fluent开展了相应的数值模拟研究。数值计算获取了与风洞试验一致的两个独立分离的涡振锁定区间风振曲线，并且在区间跨度以及幅值关系上均吻合良好，然后通过Fluent提取了前后两个涡振锁定区间内的气动力和尾流漩涡进行了对比研究。研究结果表明，第一个锁定区间内的尾流漩涡呈现出经典的卡门涡街形态，第二个区间内的尾流涡模态则主要表现为非典型的“鱼尾摆动”形态，两个涡振区间的尾流形态完全不同；在两个独立的锁定区间内，气动升力与位移响应之间始终存在着相位差，并且均随着锁定区间的发展而持续增大，第一个锁定区间相位差的跳跃程度明显大于第二个锁定区间。

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.

导出引用

黄俐1，周帅2，梁鹏3. 桥梁断面两个涡振锁定区间的数值模拟研究[J]. 振动与冲击, 2016, 35(11): 47-53

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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