Journal article

Reynolds number and roughness effects on turbulent stresses in sandpaper roughness boundary layers

C Morrill-Winter, DT Squire, JC Klewicki, N Hutchins, MP Schultz, I Marusic

PHYSICAL REVIEW FLUIDS | AMER PHYSICAL SOC | Published : 2017

Abstract

Multicomponent turbulence measurements in rough-wall boundary layers are presented and compared to smooth-wall data over a large friction Reynolds number range (δ+). The rough-wall experiments used the same continuous sandpaper sheet as in the study of Squire et al. [J. Fluid Mech. 795, 210 (2016)JFLSA70022-112010.1017/jfm.2016.196]. To the authors' knowledge, the present measurements are unique in that they cover nearly an order of magnitude in Reynolds number (δ+≃2800-17400), while spanning the transitionally to fully rough regimes (equivalent sand-grain-roughness range, ks+≃37-98), and in doing so also maintain very good spatial resolution. Distinct from previous studies, the inner-normal..

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Grants

Funding Acknowledgements

The authors thank the Australian Research Council for the financial support of this research. M.P.S. thanks the US Office of Naval Research for supporting his sabbatical visit to the University of Melbourne.