Journal article
The wind-shade roughness model for turbulent wall-bounded flows
Charles Meneveau, Nicholas Hutchins, Daniel Chung
Journal of Fluid Mechanics | Cambridge University Press | Published : 2024
DOI: 10.1017/jfm.2024.971
Abstract
To aid in prediction of turbulent boundary layer flows over rough surfaces, a new model is proposed to estimate hydrodynamic roughness based solely on geometric surface information. The model is based on a fluid-mechanics motivated geometric parameter called the wind-shade factor. Sheltering is included using a rapid algorithm adapted from the landscape shadow literature, while local pressure drag is estimated using a piecewise potential flow approximation. Similarly to evaluating traditional surface parameters such as skewness or average slope magnitude, the wind-shade factor is purely geometric and can be evaluated efficiently from knowing the surface elevation map and the mean flow direct..
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Awarded by Office of Naval Research
Awarded by AFOSR
Awarded by Air Force Office of Scientific Research
Funding Acknowledgements
The authors gratefully acknowledge the roughness database hosted at the University of Southamptonthat provides public access to crucially important data in this field. They also thank Dr T. Jelly forhelp accessing the surface data for cases #1,2,3, and Professor I. Marusic for valuable comments andencouraging remarks about this project. C.M. acknowledges the Miegunyah fellowship and the Department of Mechanical Engineering at the University of Melbourne for making a sabbatical visit there possible, aswell as partial support from the Office of Naval Research (grant # N00014-21-1-2162) and AFOSR (grant #FA9550-23-1-0269)). D.C. and N.H. acknowledge the support of the Air Force Office of Scientific Research under award number FA2386-23-1-4071 (program manager: D.J. Newell, AOARD) and also support from the Australian Research Council via the Discovery and Linkage Programs.