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Three-Dimensional Numerical Simulations of Vortex-Induced Vibrations of a Circular Cylinder in Oscillatory Flow
| 题名： | Three-Dimensional Numerical Simulations of Vortex-Induced Vibrations of a Circular Cylinder in Oscillatory Flow |
| 其他题名： | An,H.,Cheng,L.,and Zhao,M.(2011)."Direct numerical simulation of oscillatory flow around a circular cylinder at low Keulegan–Carpenter number."J.Fluid Mech.,666,77–103. |
| 正文语种： | 英文 |
| 作者： | Ming Zhao |
| 关键词： | Vortex-induced vibration;Oscillatory flow;Cylinder;Numerical simulation;Vortex shedding |
| 摘要： | Vortex-induced vibration (VIV) of an elastically mounted rigid circular cylinder in an oscillatory flow is investigated by threedimensional direct numerical simulations (DNS). The cylinder is allowed to vibrate only in the cross-flow direction. The main aim of the study is to investigate the correlation between the vibration, the lift coefficient, and the vortex shedding flow. The three-dimensional Navier-Stokes equations are solved using the Petrov-Galerkin finite-element method for predicting flow, and the equation of motion is solved for predicting the vibration of the cylinder. Simulations are carried out with a Reynolds number (R) of 500, Keulegan-Carpenter (KC) numbers of 10 and 20, and reduced velocities (Vr) in the range of 2–16. The dominant frequencies of the displacement and lift coefficient synchronize for both KC values when Vr is small. For KC = 10, the frequencies of the vibration and the lift coefficient deviate from each other at large Vr values. The cylinder vibrates at a frequency that is a multiple of the oscillatory flow frequency and is close to the natural frequency measured in water. For KC = 20, where the lift coefficient has multiple frequencies, the intermittent change of the vibration frequencies is observed at large reduced velocities. The number of vortices shed from the cylinder is increased by the vibration of the cylinder compared with the case of a stationary cylinder. Extra vortices are shed from the cylinder after flow reversal, and they do not significantly affect the overall vortex flow pattern because they are very weak. |
| 出版年： | 2017 |
| 论文唯一标识： | P-108Y2017V143N04006 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/(ASCE)WW.1943-5460.0000391 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 拼音刊名(出版物代码)： | P-108 |
| 卷： | 143 |
| 期： | 04 |
| 页码： | 57-72 |
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