EXPERIMENTAL STUDY ON EVOLUTION OF WAKE STRUCTURES IN FLOW PAST THE CIRCULAR CYLINDER PLACED NEAR THE WALL

被引：0

作者：

Qiu X. ^{[1
]}

Wu H. ^{[2
]}

Tao Y. ^{[1
]}

Li J. ^{[3
]}

Zhou J. ^{[4
]}

Liu Y. ^{[1
,4
]}

机构：

[1] School of Science, Shanghai Institute of Technology, Shanghai

[2] School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai

[3] College of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai

[4] Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai

来源：

Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics | 2022年 / 54卷 / 11期

关键词：

flow past circular cylinder; near-wall; particle image velocimetry; Reynolds number;

D O I：

10.6052/0459-1879-22-403

中图分类号：

学科分类号：

摘要：

The experimental measurement of the flow field around the circular cylinder near the wall is carried out by using the Particle Image Velocimetry. The characteristics of the flow regime under different Reynolds numbers (Re = 1500 ∼ 5540) together with three different gap ratios (G/ D = 0.5, G/ D = 1.0, G/ D = 1.5) are studied. The experiment results shows that for the case of G/ D = 0.5, with the increasing of Reynolds number, the recirculation zone behind the cylinder is gradually symmetrical about the centerline of the cylinder while its size is decreasing, and the size of the separation bubble on the wall also decreases gradually. The experiment reveals that the cylindrical wake and the gap flow perform differently while the Reynolds numbers Ret between Re = 3000 ∼ 3200 . When the Reynolds number is smaller than Ret , a small separation bubble will form on the front wall of the cylinder, which hinders the flow of upstream fluid through the gap and reduces the intensity of the gap flow, and then deviates from the wall. At Re = 1500, the vortex shedding frequency increases with the decrease of the gap ratio. And with the decrease of gap ratio, the vortex shedding frequency increases first and then decreases in a small range (0.185 ≦ St ≦ 0.227) for Re ≧ 3000 . The Reynolds number has a significant influence on the flow characteristics, especially for the case of small gap ratios. At G/ D = 0.5, the secondary vortex deviates from the wall and moves upward to the position close to the upper wake vortex, and the vortex merging process appears between the upper wake vortex and the secondary vortex for the Re = 1500 . As the Reynolds number increases to Re = 5540, the secondary vortex does not merge with the upper wake vortex, and the secondary vortex directly interacts with the lower wake vortex. At G/ D = 1.0 and G/ D = 1.5, the energy carried by the secondary vortex is decreasing gradually with the increasing of Reynolds number. © 2022 Chinese Journal of Theoretical and Applied Mechanics Press. All rights reserved.

引用

页码：3042 / 3057

页数：15

共 39 条

[1] Chen LF, Wu GX., Boundary shear flow past a cylinder near a wall, Applied Ocean Research, 92, (2019)
[2] Li JH, Xia YX, Qiu X, Et al., Vortex statistics of a cylinder wake flow close to the wall based on IB-LBM, Modern Physics Letters B, 33, 29, (2019)
[3] Jiang H, Cheng L., Large-eddy simulation of flow past a circular cylinder for Reynolds numbers 400 to 3900, Physics of Fluids, 33, 3, (2021)
[4] Bearman PW, Zdravkovich MM., Flow around a circular cylinder near a plane boundary, Journal of Fluid Mechanics, 89, 1, pp. 33-47, (1978)
[5] Lei C, Cheng L, Kavanagh K., Re-examination of the effect of a plane boundary on force and vortex shedding of a circular cylinder, Journal of Wind Engineering and Industrial Aerodynamics, 80, 3, pp. 263-286, (1999)
[6] Taneda S., Experimental investigation of vortex streets, Journal of the Physical Society of Japan, 20, 9, pp. 1714-1721, (1965)
[7] Price SJ, Sumner D, Smith JG, Et al., Flow visualization around a circular cylinder near to a plane wall, Journal of Fluids and Structures, 16, 2, pp. 175-191, (2002)
[8] Lin WJ, Lin C, Hsieh SC, Et al., Flow characteristics around a circular cylinder placed horizontally above a plane boundary, Journal of Engineering Mechanics, 135, 7, pp. 697-716, (2009)
[9] Khabbouchi I, Guellouz MS, Nasrallah SB., A study of the effect of the jet-like flow on the near wake behind a circular cylinder close to a plane wall, Experimental Thermal and Fluid Science, 44, pp. 285-300, (2013)
[10] Wang XK, Tan SK., Near-wake flow characteristics of a circular cylinder close to a wall, Journal of Fluids and Structures, 24, 5, pp. 605-627, (2008)

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