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

• Published in: Journal of hydrodynamics. Series B Vol. 27; no. 2; pp. 195 - 203
• Main Author: 张蕙 杨建民 肖龙飞 吕海宁
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.04.2015; Springer Singapore; State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China
• 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; large-eddy simulation (LES); circular cylinder; vortex shedding
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(15)60472-3

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.