Large-eddy simulation of the turbulent structure in compound open-channel flows

Xie, Zhihua ORCID: https://orcid.org/0000-0002-5180-8427, Lin, Binliang ORCID: https://orcid.org/0000-0001-8622-5822 and Falconer, Roger Alexander ORCID: https://orcid.org/0000-0001-5960-2864 2013. Large-eddy simulation of the turbulent structure in compound open-channel flows. Advances in Water Resources 53 , pp. 66-75. 10.1016/j.advwatres.2012.10.009

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Abstract

A large-eddy simulation study has been undertaken to investigate the turbulent structure of open-channel flow in an asymmetric compound channel. The dynamic sub-grid scale model has been employed in the model, with the partial cell treatment being implemented using a Cartesian grid structure to deal with the floodplain. The numerical model was used to predict the: primary velocity and secondary currents, boundary shear stress, turbulence intensities, turbulent kinetic energy, and Reynolds stresses. These parameters were compared with experimental measurements published in the literature, with relatively close agreement being obtained between both sets of results. Furthermore, instantaneous flow fields and large-scale vortical structures were predicted and are presented herein. These vorticial structures were found to be responsible for the significant lateral exchange of mass and momentum in compound channels.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Advanced Research Computing @ Cardiff (ARCCA) Engineering
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords:	Large-eddy simulation; Compound channels; Turbulence; Hydraulics; River engineering; Secondary currents
Publisher:	Elsevier
ISSN:	0309-1708
Funders:	EPSRC
Last Modified:	21 Oct 2022 10:17
URI:	https://orca.cardiff.ac.uk/id/eprint/39694

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