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TECHNICAL PAPERS

Rough Wall Turbulent Boundary Layers in Shallow Open Channel Flow

[+] Author and Article Information
M. F. Tachie, D. J. Bergstrom

Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada S7N 5A9

R. Balachandar

Department of Civil Engineering, University of Saskatchewan, Saskatoon, Canada S7N 5A9

J. Fluids Eng 122(3), 533-541 (Feb 14, 2000) (9 pages) doi:10.1115/1.1287267 History: Received March 23, 1999; Revised February 14, 2000
Copyright © 2000 by ASME
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References

Figures

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Schematic of typical velocity profile in an open channel
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Types of rough surfaces used: (a) perforated plate (PF), (b) wire mesh (WM)
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Variation of mean velocity in outer coordinates for rough and smooth surfaces (uncertainty in U/Ue:±2 percent,y/δ:±4 percent)
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Determination of Π and Uτ: Fit to Eq. (4) (uncertainty in U+:±4 percent for smooth surface and ±6 percent for rough surfaces, y/δ:±4 percent)
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Determination of log-law constant, κ (uncertainty in y+dU+/dy+:±6 percent)
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(a) Velocity defect distribution for smooth wall: present and previous data. (b) Velocity defect distribution for smooth and rough surfaces: solid line is a fit to Hama profile (Π=0.55)
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Velocity distribution in inner coordinates (uncertainty in y+:±4 percent)
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Variation of skin friction coefficient with Reθ for smooth and rough surfaces (uncertainty in Cf:±6 percent for smooth surface and ±12 percent for rough surfaces, Reθ:±5 percent)
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Variation of shape factor (H) with skin friction coefficient (Cf) for smooth and rough surfaces at different freestream turbulence values (uncertainty in H:±4 percent)
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Variation of turbulence intensity on smooth surfaces at various freestream turbulence levels (uncertainty in urms+:±5 percent,y/δ:±5 percent)
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Variation of turbulence intensity for (a) smooth and (b) rough surfaces (uncertainty in urms+:±5 percent for smooth surface and ±8 percent for rough surfaces)

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