RESEARCH PAPERS: Additional Technical Papers

Prediction of Turbulent Rough-Wall Skin Friction Using a Discrete Element Approach

[+] Author and Article Information
R. P. Taylor, H. W. Coleman, B. K. Hodge

Mechanical and Nuclear Engineering Department, Mississippi State University, Mississippi State, MS 39762

J. Fluids Eng 107(2), 251-257 (Jun 01, 1985) (7 pages) doi:10.1115/1.3242469 History: Received May 09, 1984; Online October 26, 2009


A discrete element model for turbulent flow over rough surfaces has been derived from basic principles. This formulation includes surface roughness form drag and blockage effects as a constituent part of the partial differential equations and does not rely on a single-length-scale concept such as equivalent sandgrain roughness. The roughness model includes the necessary empirical information on the interaction between three-dimensional roughness elements and the flow in a general way which does not require experimental data on each specific surface. This empirical input was determined using data from well-accepted experiments. Predictions using the model are compared with additional data for fully-developed and boundary layer flows. The predictions are shown to compare equally well with both transitionally rough and fully rough turbulent flows without modification of the roughness model.

Copyright © 1985 by ASME
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