Large-eddy simulation of the flow past both finite and infinite circular cylinders at Re=3900

The flow past a finite circular cylinder with a height-to-diameter ratio of 1.5 and an infinite circular cylinder of the same diameter at a Reynolds number Re= 3 900 is investigated using the large eddy simulation（LES）. The objective of the present study is to explore the differences of the flow mec...

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Bibliographic Details
Published in:Journal of hydrodynamics. Series B 2015-04, Vol.27 (2), p.195-203
Main Author: 张蕙 杨建民 肖龙飞 吕海宁
Format: Article
Language:English
Subjects:
circular cylinder
Engineering
Engineering Fluid Dynamics
Hydrology/Water Resources
large-eddy simulation (LES)
Numerical and Computational Physics
Simulation
vortex shedding
三维分离
分离剪切层
升力系数
圆柱体
大涡模拟
平均流量
流动机制
自由端
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Summary:The flow past a finite circular cylinder with a height-to-diameter ratio of 1.5 and an infinite circular cylinder of the same diameter at a Reynolds number Re= 3 900 is investigated using the large eddy simulation（LES）. The objective of the present study is to explore the differences of the flow mechanisms between the finite and infinite circular cylinders. It is shown that the free end of the finite circular cylinders affects the wake region significantly. The mean drag coefficient and the fluctuating lift coefficient of the finite circular cylinder are smaller than those of the infinite circular cylinder. The three-dimensional separation and the separated shear layer instability of the finite circular cylinder can obviously be observed. The existence of an arch vortex in the average flow downstream of the free end is demonstrated.
ISSN:1001-6058
1878-0342
DOI:10.1016/S1001-6058(15)60472-3