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Analysis of velocity structures in a transitionally rough turbulent boundary layer

Doosttalab, A. , Dharmarathne, S. , Tutkun, M. , Adrian, R. , Castillo, L.
In: Whither turbulence and big data in the 21st Century? / Pollard, A., Castillo, L., Danaila, L., Glauser, M. (Eds.). - Springer International Publishing, 2017. - Print ISBN 978-3-319-41215-3, eBook ISBN 978-3-319-41217, 77-92.
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Studies on rough turbulent boundary layers have shown that the surface roughness alters the velocity field near the wall, leading to an increased skin friction. This effect is in particular felt in the roughness sub-layer (3k − 5k, where k denotes the characteristic roughness height) and may extend across the boundary layer for k∕δ < 50 as mentioned in [9] (note that δ represents the boundary layer thickness). Knowledge of the effects of roughness on turbulent structures is vital for modelling purposes and flow control strategies which can then reduce skin friction drag in turbulent boundary layers by modifying the structures of turbulence.
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