Vortex-induced vibration of a two degree-of-freedom flexibly mounted circular cylinder in the crossflow direction

物理 圆柱 涡激振动 唤醒 涡流 机械 振动 粒子图像测速 旋涡脱落 经典力学 光学 声学 几何学 湍流 数学 雷诺数
作者
Seyedmohammad Mousavisani,Naumi Noshin Chowdhury,Hadi Samsam-Khayani,Hamed Samandari,Banafsheh Seyed-Aghazadeh
出处
期刊:Journal of Fluid Mechanics [Cambridge University Press]
卷期号:952 被引量:9
标识
DOI:10.1017/jfm.2022.893
摘要

Vortex-induced vibration (VIV) of a two degree-of-freedom (DOF) circular cylinder, placed in the test section of a recirculating water tunnel and free to oscillate in its first two vibrational modes in the crossflow direction, is studied experimentally. The dynamic response of the cylinder is studied for a reduced velocity range of $U^*=4\unicode{x2013}30$ for eigenfrequency ratios in the range of 1.3–3.0. For the two DOF system, while the onset of the VIV response followed a similar lock-in region as those observed for a classical VIV response of a single DOF system, by increasing the reduced velocity a secondary lock-in region was observed over which the oscillations of the cylinder were locked into the system's second mode. In addition, there existed an intermediate range of reduced velocity over which the VIV response consisted of oscillations at a combination of the first two natural modes of the system. As the eigenfrequency ratio between the first two modes increased, the secondary lock-in range was extended to higher reduced velocities and the reduced velocity range over which multi-modal oscillations were observed was decreased. A full map of vortex dynamics in the wake of the cylinder was developed qualitatively and quantitatively using hydrogen bubble flow visualization and time-resolved volumetric particle tracking velocimetry techniques, respectively. A Q-criterion analysis revealed the existence of highly three-dimensional vortex structures in the wake of the cylinder. The spatiotemporal mode analysis using the proper orthogonal decomposition technique revealed strong coupling between the vortex shedding modes in the wake of the cylinder and the structural vibration modes.
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