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%.
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September 2012
Fundamental Issues And Canonical Flows
Characteristic Flow Field Behind a Square-Cylinder Using Upstream Mesh Fences
Chen W. Yang
Chen W. Yang
Graduate Student
Department of Mechanical and Mechatronic Engineering,
National Taiwan Ocean University
, Keelung, Taiwan 202, Republic of China
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Shun C. Yen
Professor
Chen W. Yang
Graduate Student
Department of Mechanical and Mechatronic Engineering,
National Taiwan Ocean University
, Keelung, Taiwan 202, Republic of China
J. Fluids Eng. Sep 2012, 134(9): 091202 (9 pages)
Published Online: August 22, 2012
Article history
Received:
July 9, 2010
Accepted:
August 15, 2011
Online:
August 22, 2012
Published:
August 22, 2012
Citation
Yen, S. C., and Yang, C. W. (August 22, 2012). "Characteristic Flow Field Behind a Square-Cylinder Using Upstream Mesh Fences." ASME. J. Fluids Eng. September 2012; 134(9): 091202. https://doi.org/10.1115/1.4004904
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