Surface roughness effects in turbulent boundary layers |
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Authors: | P-Å Krogstadt RA Antonia |
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Institution: | (1) Department of Mechanics, Thermo and Fluid Dynamics, Norwegian University of Science and Technology, N-7034, Trondheim-NTH, Norway, NO;(2) Department of Mechanical Engineering, University of Newcastle, Newcastle, N.S.W. 2308, Australia, AU |
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Abstract: | The effects of surface roughness on a turbulent boundary layer are investigated by comparing measurements over two rough
walls with measurements from a smooth wall boundary layer. The two rough surfaces have very different surface geometries although
designed to produce the same roughness function, i.e. to have nominally the same effect on the mean velocity profile. Different
turbulent transport characteristics are observed for the rough surfaces. Substantial effects on the stresses occur throughout
the layer showing that the roughness effects are not confined to the wall region. The turbulent energy production and the
turbulent diffusion are significantly different between the two rough surfaces, the diffusion having opposite sign in the
region γ/δ < 0.5. Although velocity spectra exhibit differences between the three surfaces, the mean energy dissipation rate
does not appear to be significantly affected by the roughness.
Received: 19 August 1998/Accepted: 16 February 1999 |
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