基于CFD方法，对质量比为7的单圆柱和并列双圆柱的涡激振动进行数值模拟研究，对单圆柱涡激振动的研究表明：其锁定区为4.8<UR<7.6，在锁定区内旋涡发放频率被结构的固有频率锁定，位移与升力的相位差为零，圆柱的无量纲振幅急剧增大。在锁定区边缘，由于涡脱频率不能完全被结构的固有频率锁定，出现“拍振”现象。对并列双圆柱涡激振动的研究表明：流场充分发展达到稳定的时间随间距比的增大而增加，在3.0≤T*≤4.0时，两圆柱的振动反相同步，在4.0<T*≤5.0时，两圆柱的振动不同步，T*≈4为两圆柱振动是否同步的临界间距比。
Based on CFD method, the vortex-induced vibration (VIV) of a single circular cylinder as well as two side-by-side arranged cylinders are investigated. Present results for the single cylinder show that the lock-in area is 4.8<UR<7.6, at where the vortex-shedding frequency is locked by the nature frequency of structure, and the dimensionless amplitude of structure dramatically increases due to the in-phase of the displacement and lift coefficient. At the boundary of the lock-in area, the beating vibration occurs as the vortex-shedding frequency cannot be totally locked by the natural frequency of the structure. Present results for the two side-by-side arranged circular cylinders show that the time for the flow to reach steady gets longer with the increase of space ratio. The vibration response of two cylinders are synchronous at 3.0≤T*≤4.0 and nonsynchronous at 4.0<T*≤5.0. The critical value of synchronous is at T*≈4.
2020,42(7): 49-53 收稿日期：2019-07-19
DOI：10.3404/j.issn.1672-7649.2020.07.010
分类号：O321
作者简介：林凌霄(1997-),男,硕士研究生,研究方向为海洋立管的涡激振动
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