Large-eddy simulation is used to study turbulent flow over a sinusoidal wavy wall from the perspective of surface roughness effects. Simulation results are averaged in time and space to obtain the so-called roughness function (shift in the logarithmic law), the equivalent sand-grain roughness and the virtual origin, and the dependence of these quantities on the amplitude-to-wavelength ratio. The results demonstrate the usefulness of LES to quantify roughness effects that have hitherto fore been the purview of laboratory experiments.
Issue Section:
Technical Briefs
1.
Calhoun, R. J., 1998, “Numerical Investigations of Turbulent Flow Over Complex Terrain,” Ph.D. thesis, Stanford University, Stanford, CA.
2.
Henn
, D. S.
, and Sykes
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, 1999
, “Large-Eddy Simulation of Flow Over Wavy Surfaces
,” J. Fluid Mech.
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, pp. 75
–112
.3.
Cui
, J.
, Patel
, V. C.
, and Lin
, C. L.
, 2003
, “Prediction of Turbulent Flow Over Rough Surfaces Using a Force Field in Large Eddy Simulation
,” ASME J. Fluids Eng.
, 125
, pp. 2
–9
.4.
Patel
, V. C.
, 1965
, “Calibration of the Preston Tube and Limitations on Its Use in Pressure Gradient
,” J. Fluid Mech.
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.5.
Schlichting, H., 1979, Boundary-Layer Theory, 7th Ed., McGraw-Hill, New York.
6.
Cebeci, T., and Bradshaw, P., 1977, Momentum Transfer in Boundary Layers, Hemisphere, Washington, DC.
Copyright © 2003
by ASME
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