Large-Eddy simulations of flow and turbulence in an asymmetric compound channel

K.V. Chua, B. Fraga, T. Stoesser, S.H. Hong, T.W. Sturm

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this study, Large-Eddy Simulations (LES) are carried out to investigate the turbulent flow in an asymmetric compound channel. A compound channel comprising of main channel and floodplains of different width on both sides is set up in analogy to a physical model, data of which are used to validate the simulations. The main channel features a parabolic cross-section and the immersed boundary method is employed to represent the main channel geometry. The streamwise time-averaged velocity obtained from these simulations is compared to the experiments carried out at the Georgia Institute of Technology at various locations of the cross-section. Reasonably good agreement between measured and numerically predicted data is found at most locations. The distributions of streamwise and crossstreamwise shear stress and the turbulent kinetic energy are elucidated. A significant shear layer forms at the interface of main channel and floodplain and the secondary flow is dominated by large-scale vortices sitting on the interface on either side of the main channel.
Original languageEnglish
Title of host publicationRiver Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
Publication statusPublished - 2016


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