Journal ArticleDOI
Numerical Model for Channel Flow and Morphological Change Studies
Yafei Jia,Sam S. Y. Wang +1 more
TLDR
In this paper, a depth-integrated 2D hydrodynamic and sediment transport model, CCHE2D, is presented to study steady and unsteady free surface flow, sediment transport, and morphological processes in natural rivers.Abstract:
In this paper a depth-integrated 2D hydrodynamic and sediment transport model, CCHE2D, is presented. It can be used to study steady and unsteady free surface flow, sediment transport, and morphological processes in natural rivers. The efficient element method is applied to discretize the governing equations, and the time marching technique is used for temporal variations. The moving boundaries were treated by locating the wet and dry nodes automatically in the cases of simulating unsteady flows with changing free surface elevation in channels with irregular bed and bank topography. Two eddy viscosity models, a depth-averaged parabolic model and a depth-averaged mixing length model, are used as turbulent closures. Channel morphological changes are computed with considerations of the effects of bed slope and the secondary flow in curved channels. Physical model data have been used to verify this model with satisfactory results. The feasibility studies of simulating morphological formation in meandering chan...read more
Citations
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NAtioNAl CooperAtive HigHwAy reseArCH progrAm
TL;DR: Warm mix asphalt (WMA) has been gaining acceptance across the United States and Canada in recent years as mentioned in this paper, and many of these demonstrations were conducted with only one or two WMA technologies.
Journal ArticleDOI
Sediment Transport Modeling Review—Current and Future Developments
Athanasios N. Papanicolaou,Mohamed Elhakeem,George A. Krallis,Shwet Prakash,John Eric Edinger +4 more
TL;DR: The use of computational hydrodynamic/sediment transport models, in general, involves the numerical solution of one or more of the governing differential equations of continuity, momentum, and energy of fluid, along with the differential equation for sediment continuity as mentioned in this paper.
Journal ArticleDOI
Three-Dimensional Numerical Model for Flow and Bed Deformation around River Hydraulic Structures
TL;DR: In this paper, a numerical model was developed to simulate flow and bed deformation around river hydraulic structures, where a nonlinear k-e turbulence model was employed in order to predict flow near the structure where three-dimensional flow is dominant.
Journal ArticleDOI
Momentum Transport in Sharp Open-Channel Bends
TL;DR: A true quasithree-dimensional flow model is obtained by coupling this nonlinear model to depth-integrated flow models, thus providing an engineering tool for morphodynamical investigations.
Journal ArticleDOI
CFD modelling approach for dam break flow studies
TL;DR: In this paper, the authors compare the shallow water approach to fully three-dimensional simulations based on the solution of the complete set of Reynolds-Averaged Navier-Stokes (RANS) equations coupled to the volume of fluid (VOF) method.
References
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Journal ArticleDOI
Open‐channel Flow Measurements with a Laser Doppler Anemometer
Iehisa Nezu,Wolfgang Rodi +1 more
TL;DR: In this article, it was shown that the log-law can be applied strictly only to the nearwall region and the von K´rm´n constant κ and integral constant A are truly universal, having values of κ=0.412 and A=5.29 irrespective of the Reynolds and Froude number.
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Flow and bed topography in channel bends
TL;DR: In this paper, a linearized flow equation was proposed to calculate the distribution of the bed shear stress in a meandering channel with fixed side walls, and the results were compared with experiments, concluding that the helical motion introduced by the channel curvature may be fairly well described.
Journal ArticleDOI
Bed Load Transport in a River Meander
TL;DR: In this paper, the authors studied the downstream bed load transport in Muddy Creek, a sand-bedded meandering river with equilibrium bottom topography, and found that a zone of maximum sediment flux shifted across the channel from near the inside bank in the upstream part of the bend toward the pool at the minimum radius of curvature.
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Laboratory measurements of the direction of sediment transport on transverse alluvial-bed slopes
TL;DR: In this article, the effect of a sloping bed on the direction of sediment transport is determined by conducting bed-levelling experiments, and a distinction is made between laboratory conditions and natural rivers.
Journal ArticleDOI
Predictions of Heat and Mass Transfer in Open Channels
Ashok K. Rastogi,Wolfgang Rodi +1 more
TL;DR: In this article, a three-dimensional model for calculating the distribution of velocity, temperature, and pollutant concentration in open channel flows, and a depth-averaged two-dimensional version for situations with insignificant stratification and secondary currents are presented.