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Hydraulic models. --- Open-channel flow. --- Water-supply. --- Water resources technology
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Simultaneous 2D pressure and 2D velocity information at the rough water-sediment interface of streambeds were gained by a newly developed measurement setup. In the bed the pressure fluctuations decay exponentially within the first 1-2 equivalent sand roughnesses. Structural findings concerning coherent flow structures are consistent with models originally developed for smooth walls. A significant bed destabilizing flow-pressure pattern was identified for the first time.
open channel flow --- pressure sensors --- coherent structures --- gravel bed --- PIV
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This thesis aims to contribute to a better understanding of turbulent open channel flow, sediment erosion and sediment transport. The thesis provides an analysis of high-fidelity data from direct numerical simulation of (i) open channel flow over an array of fixed spheres, (ii) open channel flow with mobile eroding spheres, (iii) open channel flow with sediment transport of many mobile spheres. An immersed boundary method is used to resolve the finite-size particles.
sediment erosion --- CFD --- open channel flow --- sediment transport --- turbulence
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Computational fluid dynamics. --- Open-channel flow --- Mathematics. --- Flow, Free-surface --- Flow, Open-channel --- Free-surface flow --- Fluid dynamics --- CFD (Computational fluid dynamics) --- Computer simulation --- Data processing
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Fluid mechanics --- Fluid mechanics --- Open-channel flow --- Unsteady flow (Fluid dynamics) --- Unsteady flow (Fluid dynamics) --- Water waves --- Water waves --- Wave equation. --- Wave equation. --- Mathematical models. --- Mathematical models. --- Mathematical models. --- Mathematical models. --- Mathematical models. --- Mathematical models. --- Mathematical models.
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This book presents the theory and computation of open channel flows, using detailed analytical, numerical and experimental results. The fundamental equations of open channel flows are derived by means of a rigorous vertical integration of the RANS equations for turbulent flow. In turn, the hydrostatic pressure hypothesis, which forms the core of many shallow water hydraulic models, is scrutinized by analyzing its underlying assumptions. The book’s main focus is on one-dimensional models, including detailed treatments of unsteady and steady flows. The use of modern shock capturing finite difference and finite volume methods is described in detail, and the quality of solutions is carefully assessed on the basis of analytical and experimental results. The book’s unique features include: • Rigorous derivation of the hydrostatic-based shallow water hydraulic models • Detailed treatment of steady open channel flows, including the computation of transcritical flow profiles • General analysis of gate maneuvers as the solution of a Riemann problem • Presents modern shock capturing finite volume methods for the computation of unsteady free surface flows • Introduces readers to movable bed and sediment transport in shallow water models • Includes numerical solutions of shallow water hydraulic models for non-hydrostatic steady and unsteady free surface flows This book is suitable for both undergraduate and graduate level students, given that the theory and numerical methods are progressively introduced starting with the basics. As supporting material, a collection of source codes written in Visual Basic and inserted as macros in Microsoft Excel® is available. The theory is implemented step-by-step in the codes, and the resulting programs are used throughout the book to produce the respective solutions.
Mathematical physics. --- Geotechnical engineering. --- Engineering geology. --- Engineering—Geology. --- Foundations. --- Hydraulics. --- Computer simulation. --- Mathematical Applications in the Physical Sciences. --- Geotechnical Engineering & Applied Earth Sciences. --- Geoengineering, Foundations, Hydraulics. --- Simulation and Modeling. --- Engineering --- Civil engineering --- Geology, Economic --- Computer modeling --- Computer models --- Modeling, Computer --- Models, Computer --- Simulation, Computer --- Electromechanical analogies --- Mathematical models --- Simulation methods --- Model-integrated computing --- Flow of water --- Water --- Fluid mechanics --- Hydraulic engineering --- Jets --- Architecture --- Building --- Structural engineering --- Underground construction --- Caissons --- Earthwork --- Masonry --- Soil consolidation --- Soil mechanics --- Walls --- Engineering, Geotechnical --- Geotechnics --- Geotechnology --- Engineering geology --- Physical mathematics --- Physics --- Geology --- Flow --- Distribution --- Details --- Mathematics --- Open-channel flow. --- Flow, Free-surface --- Flow, Open-channel --- Free-surface flow --- Fluid dynamics
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This Special Issue includes nine original contributions focused on river hydraulics. Four of these resulted from cooperation between universities from different countries: (a) Russia and Poland , (b) Taiwan and the USA , (c) Iran and Italy, and (d) India and Italy . The other contributions resulted from research carried out in universities from South Korea [5], Greece [6], China , and Japan .
Technology: general issues --- History of engineering & technology --- bed roughness --- open-channel flow --- OpenFOAM --- Reynolds-averaged Navier–Stokes model --- turbulence model --- two-dimensional dune --- 60° bend --- bed shear stress --- turbulent kinetic energy --- Reynolds shear stress --- log-law --- continuous bend --- transition section --- correlation of flow movement --- width/depth ratio --- circulation structure --- circulation intensity --- numerical simulation --- local scour --- spur dike --- angle of repose --- river sediment transport modeling --- alluvial channels --- hydraulic riverbed resistance --- mathematical modeling --- van Rijn sediment transport formula --- local scouring --- bridge pile group --- material harvesting pit --- hydrodynamic bridge pier --- flow pattern --- FLOW-3D --- bed load transport --- random forests --- Gaussian processes regression --- Meyer–Peter and Müller formula --- sediment transport --- incision --- meandering --- bedrock --- curved channel --- bed configurations --- annular flume --- cover lid rotation speed --- developing flow --- fully-developed flow --- Reynolds stress anisotropy tensor --- seepage flow --- turbulence intensity --- n/a --- Reynolds-averaged Navier-Stokes model --- Meyer-Peter and Müller formula
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