Roughness Effects on the Mixing Properties in Open Channel Turbulent Boundary Layers

Author:

Tachie Mark F.1,Bergstrom Donald J.2,Balachandar Ram3

Affiliation:

1. Department of Mechanical and Industrial Engineering, University of Manitoba, Winnipeg, Canada R3T 5V6

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

3. Department of Civil & Environmental Engineering, University of Windsor, Windsor, Canada N9B 3P4

Abstract

This paper investigates the effects of surface roughness on the transport and mixing properties in turbulent boundary layers created in an open channel. The measurements were obtained on a smooth and two different types of rough surfaces using a laser Doppler anemometer. The results show that surface roughness enhances the levels of the turbulence kinetic energy, turbulence production, and diffusion over most of the boundary layer. The distributions of the eddy viscosity and mixing length are also strongly modified by surface roughness. Furthermore, the extent to which surface roughness modifies the turbulence structure depends on the specific geometry of the roughness elements.

Publisher

ASME International

Subject

Mechanical Engineering

Reference30 articles.

1. Cui, J., Patel, V. C., and Lin, C.-L., 2000, “Large-Eddy Simulation of Turbulent Flow Over Rough Surfaces,” IIHR Tech. Report No. 413, Iowa Inst. of Hydr. Res., University of Iowa, USA.

2. Townsend A. A., 1976, The Structure of Turbulent Shear Flow, Cambridge University Press, Cambridge.

3. Raupach, M. R., Antonia, R. A., and Rajagopalan, S., 1991, “Rough-Wall Turbulent Boundary Layers,” Appl. Mech. Rev., 108, pp. 1–25.

4. Krogstad, P. A., and Antonia, R. A., 1999, “Surface Roughness Effects in Turbulent Boundary Layers,” Exp. Fluids, 27, pp. 450–460.

5. Tachie, M. F., Bergstrom, D. J., and Balachandar, R., 2000, “Rough Wall Turbulent Boundary Layers in Shallow Open Channel Flow,” ASME J. Fluids Eng., 122, pp. 533–541.

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