Quasisteady theory for the hydrodynamic forces on a circular cylinder undergoing vortex-induced vibration
Quasisteady theory for the hydrodynamic forces on a circular cylinder undergoing vortex-induced vibration
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DOI：
10.1007/s00773-008-0036-z
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发表时间：
2009-09
影响因子：
2.6
通讯作者：
Y. Nishi;K. Kokubun;K. Hoshino;S. Uto
中科院分区：
文献类型：
--
作者：
Y. Nishi;K. Kokubun;K. Hoshino;S. Uto
通过建立基于尾流振子模型的准定常近似理论，研究了刚性圆柱的涡激振动，从而计算了作用在圆柱上的涡激水动力。从理论上推导出了频率锁定发生的界限线。在强迫振荡问题的水动力的理论估计与实测值进行了比较。尽管发现了一些差异，特别是在高频振荡的情况下，但在大多数情况下都取得了良好的一致性。因此，我们的结论是，本理论捕捉以及真实的现象，在下游的圆柱受到流动的尾流。
Vortex-induced vibrations of a rigid circular cylinder were studied by constructing a theory based on a wake oscillator model under quasisteady approximations, thereby evaluating vortex-induced hydrodynamic forces acting on the cylinder. A lock-in limit line representing the boundary for the occurrence of frequency lock-in was also theoretically derived. Hydrodynamic forces in forced oscillation problems estimated by the theory were compared with measured ones. Although some discrepancies were found, particularly in cases with high-frequency oscillations, good agreement was achieved in most cases. Accordingly, we conclude that the present theory captures well real phenomena in the wake downstream of a cylinder subjected to a flow.