3D Numerical Modeling of Flow and Sediment Transport in Laboratory Channel Bends
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 10
Abstract
The development of a fully three-dimensional finite volume morphodynamic model, for simulating fluid and sediment transport in curved open channels with rigid walls, is described. For flow field simulation, the Reynolds-averaged Navier–Stokes equations are solved numerically, without reliance on the assumption of hydrostatic pressure distribution, in a curvilinear nonorthogonal coordinate system. Turbulence closure is provided by either a low-Reynolds number turbulence model or the standard turbulence model, both of which apply a Boussinesq eddy viscosity. The sediment concentration distribution is obtained using the convection-diffusion equation and the sediment continuity equation is applied to calculate channel bed evolution, based on consideration of both bed load and suspended sediment load. The governing equations are solved in a collocated grid system. Experimental data obtained from a laboratory study of flow in an S-shaped channel are utilized to check the accuracy of the model’s hydrodynamic computations. Also, data from a different laboratory study, of equilibrium bed morphology associated with flow through and channel bends, are used to validate the model’s simulated bed evolution. The numerically-modeled fluid and sediment transportation show generally good agreement with the measured data. The calculated results with both turbulence models show that the low-Reynolds model better predicts flow and sediment transport through channel bends than the standard model.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 10 • October 2007
Pages: 1123 - 1134
Copyright
© 2007 ASCE.
History
Received: Dec 13, 2005
Accepted: Apr 10, 2007
Published online: Oct 1, 2007
Published in print: Oct 2007
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