Numerical Simulation of Vortex-Induced Vibration of Two Rigidly Connected Cylinders in Side-by-Side and Tandem Arrangements Using RANS Model
Numerical Simulation of Vortex-Induced Vibration of Two Rigidly Connected Cylinders in Side-by-Side and Tandem Arrangements Using RANS Model
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DOI：
10.1115/1.4031257
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发表时间：
2016-02
影响因子：
2
通讯作者：
Ming Zhao;J. Murphy;K. Kwok
中科院分区：
文献类型：
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作者：
Ming Zhao;J. Murphy;K. Kwok
采用二维数值模拟方法研究了横向并排和串联刚性连接圆柱体的涡激振动（VIV）。采用二维雷诺平均Navier-Stokes（RANS）方程求解绕流，并求解运动方程求解圆柱体的响应。对于恒定质量比2.5、间隙比G（气缸之间的差距与气缸直径的比）在0.5至3的范围内、以及降低的速度在1至30的范围内进行模拟。分析了差距比对圆柱体响应的影响。在锁定制度的最大响应幅度被发现发生在G = 0.5的并排安排，这是一个单一的缸的两倍左右。在并排布置中，对于间隙比为1.5、2、2.5和3的圆柱体的响应状态比单个圆柱体的响应状态窄得多，因为在大的减小速度下，来自两个圆柱体的旋涡脱落处于异相模式。在串联布置中，对于所有计算的间隙比，圆柱的最大响应振幅大于单个圆柱的最大响应振幅。对于串联布置中的差距比为0.5，在大折合速度下的振动中没有观察到来自上游圆柱的涡脱落频率，并且响应是驰振。
Vortex-induced vibration (VIV) of two rigidly connected circular cylinders in side-by-side and tandem arrangements in the cross-flow direction was investigated using two-dimensional (2D) numerical simulations. The 2D Reynolds-Averaged Navier–Stokes (RANS) equations were solved for the flow, and the equation of the motion was solved for the response of the cylinders. Simulations were conducted for a constant mass ratio of 2.5, gap ratios G (ratio of the gap between the cylinders to the cylinder diameter) in the range of 0.5 to 3, and reduced velocities in the range of 1 to 30. The effects of the gap ratio on the response of the cylinders were analyzed extensively. The maximum response amplitude in the lock-in regime was found to occur at G = 0.5 in the side-by-side arrangement, which is about twice that of a single cylinder. In the side-by-side arrangement, the response regime of the cylinders for gap ratios of 1.5, 2, 2.5, and 3 is much narrower than that of a single cylinder, because the vortex shedding from the two cylinders is in an out-of-phase pattern at large reduced velocities. In the tandem arrangement, the maximum response amplitude of the cylinders is greater than that of a single cylinder for all the calculated gap ratios. For the gap ratio of 0.5 in the tandem arrangement, the vortex shedding frequency from the upstream cylinder was not observed in the vibration at large reduced velocities, and the response is galloping.