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采用虚拟体法数值模拟了平面单圆柱绕流强迫振动,以及空间垂直交叉双圆柱绕流下游圆柱强迫振动流场。验证了单圆柱强迫振动中的锁定状态以及相位突变现象,从而证实了该数值方法模拟振动流场的可靠性。研究了在雷诺数Re=150、间距为5倍圆柱直径、下游圆柱按正弦曲线振动时,对尾流场的影响。下游圆柱两端尾流场在振动的作用下,涡的横向间距增大,而中心尾流场由于受上游圆柱尾流的影响而保持原先的状态。下游圆柱在锁定区的振动使尾流场变得稳定,表现在流向二次涡结构的减少,以及尾流场的速度场频谱趋向单一化。
The virtual body method is used to simulate the forced vibration of planar single circular cylinder and the forced vibration flow of circular cylinder at the downstream of double vertical circular cross flow in space. The locking state and the phase mutation in the forced vibration of a single cylinder were verified, which confirmed the reliability of this numerical method to simulate the vibration flow field. The effects of Reynolds number Re = 150, the distance of five times of the cylinder diameter and the downstream cylinder on the sinusoidal vibration on wake field were studied. Under the effect of vibration, the vortices’ lateral spacing increases with the wake flow field at both ends of the downstream cylinder, while the central wake field keeps its original state due to the influence of upstream cylindrical wake. The vibration of the downstream cylinder in the lock zone stabilizes the wake field, which is manifested in the reduction of the secondary vortex structure and the simplification of the velocity field spectrum of the wake field.