Wall-bounded Turbulence Over Highly Positively and Negatively Skewed Roughness

Busse, A. and Jelly, T. O. (2021) Wall-bounded Turbulence Over Highly Positively and Negatively Skewed Roughness. 25th International Congress of Theoretical and Applied Mechanics, 22-27 Aug 2021.

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Abstract

While most engineering rough surfaces have only moderately skewed height distributions, examples of irregular rough surfaces with very high positive or negative skewness are not unusual. In the current study, the fluid dynamic properties of a set of seven irregular rough surfaces with skewness varying from -2.3 to +2.3 are investigated using direct numerical simulations of turbulent channel flow. We observe that the roughness function saturates both for very high positive and very high negative skewness, showing that extrapolation of existing empirical correlations for moderate skewness will overpredict the roughness effect for extremely skewed cases.

Item Type:Conference or Workshop Item
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Jelly, Mr Thomas and Busse, Dr Angela
Authors: Busse, A., and Jelly, T. O.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
Copyright Holders:Copyright © 2021 The Authors
Publisher Policy:Reproduced with the permission of the authors
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173479Fluid dynamic properties of irregular, multi-scale rough surfacesAngela BusseEngineering and Physical Sciences Research Council (EPSRC)EP/P004687/1ENG - Aerospace Sciences
309538Rough-wall turbulence: the Lagrangian viewAngela BusseLeverhulme Trust (LEVERHUL)RF-2020-498\9ENG - Aerospace Sciences