Abstract
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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Acknowledgements
This research was supported by the grants from NSF-CBET No. 1512393, NSF No. 21P407 B56589 200 and ONR No. 21C211 B56589 200. Dr. Tutkun’s work is partially financed by the research project DOMT—Developments in Optical Measurement Technologies funded by the Research Council of Norway with project number 231491 under the FRINATEK program.
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Doosttalab, A., Dharmarathne, S., Tutkun, M., Adrian, R., Castillo, L. (2017). Analysis of Velocity Structures in a Transitionally Rough Turbulent Boundary Layer. In: Pollard, A., Castillo, L., Danaila, L., Glauser, M. (eds) Whither Turbulence and Big Data in the 21st Century?. Springer, Cham. https://doi.org/10.1007/978-3-319-41217-7_5
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