Numerical simulation of surface roughness effects on the vortex-induced vibration of a circular cylinder at a subcritical Reynolds number
Numerical simulation of surface roughness effects on the vortex-induced vibration of a circular cylinder at a subcritical Reynolds number
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DOI：
10.1016/j.ijnaoe.2021.100430
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发表时间：
2021-12
影响因子：
2.2
通讯作者：
Wei Chen;Siying Wang;X. Shi;C. Rheem;Yongshui Lin;Erpeng Liu
中科院分区：
文献类型：
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作者：
Wei Chen;Siying Wang;X. Shi;C. Rheem;Yongshui Lin;Erpeng Liu
摘要在亚临界雷诺数为3900时，对不同表面粗糙度圆柱的涡激振动进行了数值模拟。分析了表面粗糙度对振动响应幅值、水动力系数和尾涡的影响。结果表明，随着表面粗糙度的增加，光滑圆柱的涡激响应出现了初始、上、超上、下四个分支，而当表面粗糙度K S/D= 2.5× 10− 3时，响应变为初始、上、下三个分支。初支和下支的旋涡脱落为2S型，上支和超上支（闭锁区）的旋涡脱落为P+ S-、P+ S+和2 P型。随着表面粗糙度的增加，最大振幅的差异不大，锁定范围的宽度增加。在初始和上分支的过渡处，涡相有一个大的跳跃，在上分支和下分支的过渡处，总升力相有一个大的跳跃，这些跳跃与涡脱落时间的转换有关（涡相的跳跃：2S模式到P+ S−模式;升力相的跳跃：其他模式到2S模式）。研究结果对流动与振动控制技术的发展具有重要意义。
Abstract The Vortex-Induced Vibration (VIV) of a circular cylinder with different surface roughness is numerically simulated at a subcritical Reynolds number of 3900. The effects of surface roughness on the vibration response amplitude, hydrodynamic coefficients and wake vortex are analyzed. The results show that as surface roughness increases, four branches (initial, upper, super-upper and lower branches) appear in the VIV response for a smooth cylinder, and for a cylinder with a small surface roughness of K S/D= 2.5× 10− 3, this response changes to three branches (initial, upper and lower branches). The vortex shedding for the initial and lower branches is 2S mode, and that for the upper and super-upper branches (lock-in range) is P+ S−, P+ S+ and 2P modes. With increasing surface roughness, the maximum amplitude has little difference, and the width of the lock-in range increases. A large jump in the vortex phase at the transition of the initial and upper branches and a large jump in the total lift phase at the transition of the upper and lower branches are found, and these jumps are associated with a switch in the timing of vortex shedding (jump of the vortex phase: 2S mode to P+ S− mode; jump of the lift phase: other modes to 2S mode). The results are significant for the development of flow and vibration control technology.