A modified Parametric Forcing Approach for modelling of roughness

Forooghi, P., Frohnapfel, B., Magagnato, F. and Busse, A. (2018) A modified Parametric Forcing Approach for modelling of roughness. International Journal of Heat and Fluid Flow, 71, pp. 200-209. (doi: 10.1016/j.ijheatfluidflow.2018.03.019)

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Surface roughness in turbulent channel flow is effectively modelled using a modified version of the Parametric Forcing Approach introduced by Busse and Sandham (2012). In this modified approach, the model functions are determined based on the surface geometry and two model constants, whose value can be fine tuned. In addition to a quadratic forcing term, accounting for the effect of form drag due to roughness, a linear forcing term, analogous to the Darcy term in the context of porous media, is employed in order to represent the viscous drag. Comparison of the results with full-geometry resolved Direct Numerical Simulation (DNS) data for the case of dense roughness (frontal solidity ≅0.4) shows a satisfactory prediction of mean velocity profile, and hence the friction factor, by the model. The model is found to be able to reproduce the trends of friction factor with morphological properties of surface such as skewness of the surface height probability density function and coefficient of variation of the peak heights.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Forooghi, Dr Pourya and Busse, Professor Angela
Authors: Forooghi, P., Frohnapfel, B., Magagnato, F., and Busse, A.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
Journal Name:International Journal of Heat and Fluid Flow
ISSN (Online):1879-2278
Published Online:13 April 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in International Journal of Heat and Fluid Flow 71:200-209
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
712071Fluid dynamic properties of irregular, multi-scale rough surfacesAngela BusseEngineering and Physical Sciences Research Council (EPSRC)EP/P004687/1ENG - AEROSPACE SCIENCES