Vortex-induced vibrations of a rectangular cylinder
Vortex-induced vibrations of a rectangular cylinder
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矩形圆柱体的涡激振动
DOI：
10.1016/j.oceaneng.2022.112883
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发表时间：
2022-12
影响因子：
5
通讯作者：
Renjie Jiang
中科院分区：
文献类型：
--
作者：
Bin Liu;Renjie Jiang
采用格子Boltzmann方法研究了均匀粘性不可压缩流场中单自由度弹性支承矩形柱体的涡激振动。雷诺数固定为100，机械阻尼设置为零，折合速度在1和16之间变化。结果表明，侧边比和质量比对流体和结构的行为都有显著的影响。共振范围随边比和质量比的减小而扩大。在低侧边比和低质量比的区域内，通常会出现振动频移现象，即使结构离开共振区，筒体仍会发生大幅振动。总共观察到三种不同的涡流尾流模式。机理分析表明，尾流模态与结构模态的竞争导致了振荡频率的偏移，流体与结构之间的能量传递将导致共振区的大幅振动。尾流模态的激励与圆柱形状和响应幅值有关。同时，涡的形成过程对圆柱体的运动有着重要的影响。
Vortex-induced vibrations (VIV) of an elastically mounted rectangular cylinder with one degree of freedom immersed into viscous incompressible uniform flows have been researched via the lattice Boltzmann method. The Reynolds number is fixed at 100, the mechanical damping is set to zero and the reduced velocity is varied between 1 and 16. Results demonstrate that both side ratio and mass ratio have significant influences on the behaviours of fluids and structures. Resonance can be excited extensively and its region extends with decreasing side ratio and mass ratio. In the region of low side ratio and mass ratio, a phenomenon of vibration frequency shift usually happens and even though the structure leaves the resonance region, the cylinder still undergoes a large-amplitude oscillation. A total of three distinct vortex wake modes are observed. Mechanistic analysis indicates that the shift of oscillation frequency is induced by the competition between wake mode and structure mode and large-amplitude vibrations in the resonance region will be caused by the power transfer between fluids and structures. The excitation of wake mode is associated with the cylinder shape and response amplitude. Meanwhile, the process of vortex formation has significant influences on the cylinder motion.
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