Conference Proceedings

Recovery of a turbulent boundary layer following a rough-to-smooth step-change in the wall condition

ML Mogeng, CM de Silva, R Baidya, A Rouhi, D Chung, I Marusic, N Hutchins

Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018 | Published : 2018

Abstract

© 2018 Australasian Fluid Mechanics Society. All rights reserved. This paper examines the recovery of a turbulent boundary layer that has undergone a sudden streamwise transition from a rough-walled to a smooth-walled surface. Despite studies over the past few decades these flows are yet to be fully understood. In particular, these attempts have been hampered by reliability issues in determining the local wall-shear stress after the transition [1], where many existing tools for measuring the wall-shear stress fail due to non-equilibrium, non-canonical conditions. Here, we utilise a collection of experimental databases at Reτ ≈ 3500 with direct measures of the wall-shear stress to understand ..

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