Effect of flow around a wall-mounted 2D square cylinder on WSS in a TBL

ZHANG Zhihao; FU Qixing; WANG Qingyang; XU Shengjin

doi:10.11729/syltlx20230035

Volume 37 Issue 4

Aug. 2023

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2023 > 37(4): 18-28

ZHANG Z H, FU Q X, WANG Q Y, et al. Effect of flow around a wall-mounted 2D square cylinder on WSS in a TBL[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(4): 18-28 doi: 10.11729/syltlx20230035

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Effect of flow around a wall-mounted 2D square cylinder on WSS in a TBL

doi: 10.11729/syltlx20230035

ZHANG Zhihao^{1, 2
,},
FU Qixing¹,
WANG Qingyang³,
XU Shengjin^{1
,
,}

1.
School of Aerospace Engineering, Tsinghua University, Beijing　100084, China
2.
China Academy of Aerospace Aerodynamics, Beijing　100074, China
3.
China Automotive Engineering Research Institute Co., Ltd, Chongqing　401122, China

Received Date: 2023-03-15
Accepted Date: 2023-07-03
Rev Recd Date: 2023-06-28

Available Online: 2023-08-04

Publish Date: 2023-08-30

Abstract

Abstract

In this paper, the effect of flow around a wall-mounted 2D square cylinder on WSS (Wall Shear Stress) in a TBL (Turbulent Boundary Layer) is studied using TR–PIV and hot wires. The Reynolds number, defined by the cylinder width and the free stream velocity, is fixed at 1.1 × 10⁴. There exist two types of large-scale flow structures, i.e., vortex I which denotes those moving towards the wall, and vortex II which denotes those moving downstream. The flow structures have significant effects on the flow and WSS: increasing the streamwise velocity gradient that results in a sharply increased WSS; reducing the streamwise velocity gradient that results in a sharply decreased WSS; and changing the WSS direction. The study is helpful to understand the physics of surface erosion, pollutant accumulation, flow energy loss, etc.
- wall-mounted 2D cylinder,
- wall shear stress,
- turbulent boundary layer,
- flow structure

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References(21)

References

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