Journal article

Influence of Surface Anisotropy on Turbulent Flow Over Irregular Roughness

Angela Busse, Thomas O Jelly

Flow, Turbulence and Combustion | Springer Verlag | Published : 2020

Abstract

The influence of surface anisotropy upon the near-wall region of a rough-wall turbulent channel flow is investigated using direct numerical simulation (DNS). A set of nine irregular rough surfaces with fixed mean peak-to-valley height, near-Gaussian height distributions and specified streamwise and spanwise correlation lengths were synthesised using a surface generation algorithm. By defining the surface anisotropy ratio (SAR) as the ratio of the streamwise and spanwise correlation lengths of the surface, we demonstrate that surfaces with a strong spanwise anisotropy (SAR  1) equivalent. Furthermore, we find that the relationship between the roughness function ΔU+ and the SAR parameter appro..

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University of Melbourne Researchers

Grants

Awarded by United Kingdom Engineering and Physical Sciences Research Council (EPSRC)


Funding Acknowledgements

This study was funded by the United Kingdom Engineering and Physical Sciences Research Council (EPSRC) (grant numbers EP/P004687/1, EP/P009875/1 and EP/L000261/1).