Fundamental Issues and Canonical Flows

Characteristic Flow Field Behind a Square-Cylinder Using Upstream Mesh Fences

[+] Author and Article Information
Shun C. Yen1

Chen W. Yang

Department of Mechanical and Mechatronic Engineering,  National Taiwan Ocean University, Keelung, Taiwan 202, Republic of China


Corresponding author.

J. Fluids Eng 134(9), 091202 (Aug 22, 2012) (9 pages) doi:10.1115/1.4004904 History: Received July 09, 2010; Accepted August 15, 2011; Published August 22, 2012; Online August 22, 2012

The flow behaviors around a square cylinder were modulated using the passive mesh fence. The effects of Reynolds number (Re) and rotation angle (θ) on the square-cylinder flow fields using different turbulence intensity (TI) were also investigated. Additionally, various steel mesh fences with different mesh densities were installed between the nozzle outlet and the test-section inlet to adjust the free-stream TI. The Reynolds number and turbulence intensity used in this investigation are 3.0 × 104  ≤ Re ≤ 1.0 × 105 and 0.32% ≤ TI ≤ 0.82%. The flow fields are visualized using the surface oil-flow visualization scheme. Furthermore, the flow patterns are classified as—leading-edge bubble, separation bubble, separation, leading-edge separation, and boundary-layer attached modes. Specifically, the leading-edge bubble mode does not exist while θ and TI are low. Moreover, a hot-wire anemometer was placed in the wake to detect the vortex-shedding frequency. The experimental results indicate that Strouhal number (St) decreases with increasing the free-stream TI while TI < 0.45%. However, St approaches a constant as TI > 0.45%. Furthermore, the surface pressure was detected using a pressure scanner and the drag coefficient (CD ) was obtained using the surface-pressure profile. The experimental results also reveal that CD decreases with increasing the free-stream TI. However, the change rate of CD for TI < 0.45% exceeds that for TI > 0.45%.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 4

Schematic sketches of surface oil-flow patterns

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Figure 7

Variations of (a) Strouhal number (St) versus θ using various TI at Re = 8.0 × 104 , and (b) Strouhal number (St) versus TI using various Reynolds numbers at θ = 0 deg

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Figure 8

Distributions of pressure coefficient (Cp) along the peripheral of square cylinders using various turbulence intensities at Re = 8.0 × 104 for (a) θ = 0 deg, (b) θ = 11 deg, (c) θ = 12 deg, (d) θ = 15 deg, (e) θ = 30 deg, (f) θ = 36 deg, and (g) θ = 45 deg

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Figure 9

Variations of drag coefficient (CD ) and lift coefficient (CL ) versus rotation angle (θ) using various TI while Re = 8.0 × 104

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Figure 2

Variations of free-stream turbulence intensity (TI) versus nondimensional coordinate (x/w) while Re = 8.0 × 104

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Figure 1

Experimental setup

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Figure 3

Surface oil-flow patterns at Re = 8.0 × 104

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Figure 5

Distributions of boundary-layer flow modes

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Figure 6

(a) Variations of instantaneous velocity (u) versus time (t). (b) Distributions of power-spectral-density function versus log f. Re = 1.3 × 104 .




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