Journal ArticleDOI
Calculation of strongly curved open channel flow
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In this paper, the authors describe the application of a finite-difference calculation procedure to the problem of simulating the three-dimensional, turbulent flow in a strongly curved, open, 180° bend with straight inlet and outlet reaches.Abstract:
The paper describes the application of a finite-difference calculation procedure to the problem of simulating the three-dimensional, turbulent flow in a strongly curved, open, 180° bend with straight inlet and outlet reaches. The configuration can be considered to represent an element of a model meander, and the work presented here forms an important stage in efforts to simulate the flow in successive reverse-curvature bends. No restrictions other than the absence of flow separation and hydraulic jumps are imposed. Full account is taken of non-linear fluid-inertia and of turbulent diffusion terms. Effects of turbulence are represented by an eddy viscosity related to two parameters— the turbulent kinetic energy k and its rate of dissipation ϵ\N— for which related differential transport equations are solved. Predictions are presented for the transverse surface slope and velocity field in a configuration experimentally examined by Rozovskii. Agreement between predictions and experimental data is judged to be satisfactory on all major flow phenomena.read more
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Turbulence models and their applications to the prediction of internal flows: a review
TL;DR: In this paper, a brief account of various turbulence models employed in the computation of turbulent flows, and evaluation of the application of these models to selected internal flow configurations is presented. But, the main conclusions of this analysis are: (1) the k-epsilon model is used in a majority of all the two-dimensional flow calculations reported in the literature; (2) modified forms of the K-Epsilon model improve the performance for flows with streamline curvature and heat transfer; (3) for flow with swirl, the algebraic stress model performs rather
Journal ArticleDOI
Flow in meander bends with recirculation at the inner bank
TL;DR: Three‐dimensional time‐averaged computational fluid dynamics models of two natural bends with inner‐bank separation with substantial differences in detail appear to be due to differences in upstream planform, manifested through the lateral distribution of inflow velocity.
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Numerical simulation of three-dimensional, time-averaged flow structure at river channel confluences
TL;DR: In this paper, the authors used a three-dimensional numerical model, with a fully elliptic solution, a free surface treatment, and a turbulence model based on a renormalized group (RNG) to help to provide a physically based explanation of the controls upon flow structure generation for both a laboratory (rectangular) and a field confluence (the confluence of the Kaskaskia River and Copper Slough) and to identify the particular conditions under which particular flow structures are observed.
Journal ArticleDOI
Depth-averaged open-channel flow model
Thomas Molls,M. Hanif Chaudhry +1 more
TL;DR: In this article, a general mathematical model is developed to solve unsteady, depth-averaged equations using boundary-fitted coordinates, including effective stresses, and may be used to analyze sub- and super critical flows.