Journal article

Recovery of wall-shear stress to equilibrium flow conditions after a rough-to-smooth step change in turbulent boundary layers

Mogeng Li, Charitha M de Silva, Amirreza Rouhi, Rio Baidya, Daniel Chung, Ivan Marusic, Nicholas Hutchins

Journal of Fluid Mechanics | Cambridge University Press (CUP) | Published : 2019

Abstract

This paper examines the recovery of the wall-shear stress of a turbulent boundary layer that has undergone a sudden transition from a rough to a smooth surface. Early work of Antonia & Luxton (J. Fluid Mech., vol. 53, 1972, pp. 737–757) questioned the reliability of standard smooth-wall methods for measuring wall-shear stress in such conditions, and subsequent studies show significant disagreement depending on the approach used to determine the wall-shear stress downstream. Here we address this by utilising a collection of experimental databases at 𝜏Re𝜏≈4100 that have access to both ‘direct’ and ‘indirect’ measures of the wall-shear stress to understand the recovery to equilibrium conditio..

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Grants

Awarded by Australian Research Council


Funding Acknowledgements

This research was partially supported under the Australian Research Council's Discovery Projects funding scheme (project DP160103619). This research was also supported by resources provided by the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia and by the National Computing Infrastructure (NCI), which is supported by the Australian Government.