Journal article
Smooth- and rough-wall boundary layer structure from high spatial range particle image velocimetry
DT Squire, C Morrill-Winter, N Hutchins, I Marusic, MP Schultz, JC Klewicki
Physical Review Fluids | American Physical Society | Published : 2016
Abstract
Two particle image velocimetry arrangements are used to make true spatial comparisons between smooth- and rough-wall boundary layers at high Reynolds numbers across a very wide range of streamwise scales. Together, the arrangements resolve scales ranging from motions on the order of the Kolmogorov microscale to those longer than twice the boundary layer thickness. The rough-wall experiments were obtained above a continuous sandpaper sheet, identical to that used by Squire et al. [J. Fluid Mech. 795, 210 (2016)JFLSA70022-112010.1017/jfm.2016.196], and cover a range of friction and equivalent sand-grain roughness Reynolds numbers (12000≲δ+≲ 18000, 62≲ks+≲104). The smooth-wall experiments compr..
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Funding Acknowledgements
The authors wish to thank the Australian Research Council for the financial support of this research. M.P.S. would like to thank the U.S. Office of Naval Research for supporting his sabbatical visit to the University of Melbourne.