Rough Wall Modification of Two-Layer k−ε

[+] Author and Article Information
P. A. Durbin, G. Medic, J.-M. Seo, J. K. Eaton, S. Song

Mechanical Engineering Department, Stanford University, Stanford, CA 94305-3030

J. Fluids Eng 123(1), 16-21 (Nov 17, 2000) (6 pages) doi:10.1115/1.1343086 History: Received May 08, 2000; Revised November 17, 2000
Copyright © 2001 by ASME
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Computed log layers compared to data correlation
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Calibration curve for hydrodynamic roughness
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Rough wall in zero and favorable pressure gradients. Clockwise from upper left: kr=0,Kr=1.5×10−4,Kr=2.9×10−4,▴=r+/10,▪=St,•=Cf.
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Predicted effect of adverse pressure gradient on smooth and rough wall
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Ramp geometry for present experiment
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Profiles of U velocity component at various downstream positions. Experiment •, rough wall; ×, smooth wall. Computation –, rough wall; ----, smooth wall.
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Flow domain for sand dune test case. Dimensions are in mm. The lighter lines show streamlines of the separated flow over the roughened ramp.
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Friction coefficient on lower wall. □, experiment; –, present; -X--, k−ω; ⋯⋯⋅⋅, smooth wall.
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U-velocity profiles at stations 4, 7, and 14, proceeding clockwise from the upper left. Lines are computations, squares are experiment.
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V-velocity profiles at stations 4, 7, and 14. Lines are computations, squares are experiment.




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