Physically realistic roughness closure scheme to simulate turbulent channel flow over rough beds within the framework of LES

Stoesser, Thorsten ORCID: https://orcid.org/0000-0001-8874-9793 2010. Physically realistic roughness closure scheme to simulate turbulent channel flow over rough beds within the framework of LES. Journal of Hydraulic Engineering 136 (10) , pp. 812-819. 10.1061/(ASCE)HY.1943-7900.0000236

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Abstract

A physically realistic roughness closure method for the simulation of turbulent open-channel flow over natural beds within the framework of large-eddy simulation (LES) is proposed. The description of bed roughness in LES is accomplished through a roughness geometry function together with forcing terms in the momentum equations. The major benefit of this method is that the roughness is generated from one physically measurable parameter, i.e., the mean grain diameter of the bed material. A series of flows over rough beds, for which mean flow and turbulence statistics are available from experiments, is simulated. Measured and computed values are compared to validate the proposed roughness closure approach. It is found that predicted streamwise velocity profiles, turbulence intensities, and turbulent shear stress profiles match the measured values fairly well. Furthermore, the effect of roughness on the overall flow resistance is predicted in reasonable agreement with experimental values.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	LES, Rough bed, Turbulence, Roughness closure
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0733-9429/ (accessed 25/02/2014)
Publisher:	American Society of Civil Engineers
ISSN:	0733-9429
Date of First Compliant Deposit:	30 March 2016
Last Modified:	09 May 2023 16:03
URI:	https://orca.cardiff.ac.uk/id/eprint/43919

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