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Comparative study of 1D and 2D flow simulations at open-channel junctions
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In this paper, a comparison between the 1D and 2D approaches for simulating combining flows at open-channel junctions is presented, allowing for a full comprehension of flow modelling.Abstract:
In this paper, a comparison between the 1D and 2D approaches for simulating combining flows at open-channel junctions is presented. The two approaches are described allowing for a full comprehension of flow modelling. For flows in an open-channel network, mutual effects exist among the channel branches at a junction. Therefore, the 1D Saint-Venant equations for the branch flows are supplemented by various junction models. The existing models are of empirical nature and depend on the flow regime and thus are not practical in all cases. The numerical approximation of the two approaches is performed by the Runge–Kutta discontinuous Galerkin scheme and tested using defined flow problems to illustrate the results of the two approaches. Comparisons are conducted for supercritical, transitional and subcritical flows, indicating the validity range of the 1D approach and the advantages of the 2D approach.read more
Citations
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Comparative 1D and 3D numerical investigation of open-channel junction flows and energy losses
TL;DR: In this paper, a modified 1D nonlinear dynamic model and a fully 3D non-hydrostatic, Reynolds-averaged Navier-Stokes Equations (RANS)-based, Computational Fluid Dynamics (CFD) model are presented.
Journal ArticleDOI
Modelling of the tributary momentum contribution to predict confluence head losses
TL;DR: In this paper, the authors proposed a new model to determine the head losses at confluences in one-dimensional models of open channel networks, making use of a momentum conservation approach.
Transitional flow in channel junctions
NIHan-gen,LIUYa-kun +1 more
TL;DR: In this article, a simple one-dimensional formulation was proposed to predict the transitional flow at an open-channel junction, based on energy and continuity equations, and an empilical relation between the junction losses, the junction angle, and the discharge ratio was suggested which agrees well with the experimental results.
Journal ArticleDOI
Comparison between a coupled 1D-2D model and a fully 2D model for supercritical flow simulation in crossroads
TL;DR: In this paper, a comparison in terms of accuracy and computational cost between a coupled 1D-2D shallow water model and a fully two-dimensional (2D) model is presented.
Journal ArticleDOI
An integrated model coupling open-channel flow, turbidity current and flow exchanges between main river and tributaries in Xiaolangdi Reservoir, China
TL;DR: In this article, an integrated numerical model coupling open-channel flow, turbidity current and flow exchanges between main river and tributaries is proposed, which can simulate the complex flow and sediment transport in a reservoir where these three physical processes coexist.
References
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Journal ArticleDOI
Flow Characteristics at Rectangular Open-Channel Junctions
TL;DR: In this article, a study of the phenomena associated with the combining and dividing flow of water in open and closed conduits is presented. But this paper is concerned only with the combination and separation of water flows.
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Three-Dimensional Numerical Study of Flows in Open-Channel Junctions
TL;DR: In this paper, a three-dimensional numerical model is developed to investigate the open-channel junction flow, which is encountered in many hydraulic structures ranging from wastewater treatment facilities to fish passage conveyance structures.
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Investigation of controls on secondary circulation in a simple confluence geometry using a three-dimensional numerical model
TL;DR: In this article, a 3D Navier-Stokes model is used to simulate the flow in a parallel confluence of unequal depth channels and investigate the effect of different combinations of velocity and depth ratio between the two tributaries.
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Subcritical Junction Flow
TL;DR: In this article, the main flow features of subcritical junction flows are explored, based on an extended hydraulic model study, and the flow conditions chosen resulted in flows that are governed by the Froude similarity law.
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Combining Open Channel Flow at Right Angled Junctions
TL;DR: In this article, the authors show that the rise in the upstream flow depth due to the effect of lateral inflow from the branch channel can be significant for rightangled, sharpedged junctions of rectangu...