Abstract
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 language | English |
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| Title of host publication | River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016 |
| Publication status | Published - 2016 |