World Environmental and Water Resources Congress 2018
Development and Verification of a Three-Dimensional Model for Flow Hydrodynamic and Sediment Transport Simulation
Publication: World Environmental and Water Resources Congress 2018: Hydraulics and Waterways, Water Distribution Systems Analysis, and Smart Water
ABSTRACT
Three-dimensional (3D) flow and sediment transport modelling, with non-hydrostatic assumption, is rarely carried out in hydraulic applications. The use is often limited to academic research to gain physical understanding of complex flows or sediment transport processes. Such a modelling is labor intensive and demands prohibitive computing resources. Preparation of 3D meshes is a tedious process that requires the use of commercial software. Model execution often requires access to super computers unavailable to most engineers. In this study, we report the research and development effort at the Bureau of Reclamation in developing a 3D model for future general-purpose and license-free modelling of practical river applications. Several new techniques are proposed to achieve the objectives. First, an unstructured physical-coordinate sigma mesh is proposed and developed. With this mesh, only a two-dimensional (2D) horizontal mesh is needed, which may assume arbitrary polygonal shapes. The vertical mesh is automatically generated conforming to the bed and free surface elevations. Second, the mesh is allowed to move in the vertical direction by adopting the Lagrangian-Eulerian formulation; this way, the mesh points move adaptively according to the free surface and bed changes. Third and final, a special 3D sediment transport module is developed and coupled to the 3D flow solver. The outcome is a general 3D model that may be used to simulate local scours in practical rivers. In the paper, we will highlight the numerical methods developed, and present model test, and verification results in comparison with available experimental data.
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ACKNOWLEDGEMENT
The study is part of a collaborative agreement between the Bureau of Reclamation and Taiwan Water Resources Agency (WRA). Funding support from both the Reclamation Science and Technology Program and Taiwan WRA are acknowledged. Special thank is to Mr. Kuowei Wu (WRA) who provided technical supervision for the study.
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Published In
World Environmental and Water Resources Congress 2018: Hydraulics and Waterways, Water Distribution Systems Analysis, and Smart Water
Pages: 18 - 30
Editor: Sri Kamojjala, Las Vegas Valley Water District
ISBN (Online): 978-0-7844-8142-4
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© 2018 American Society of Civil Engineers.
History
Published online: May 31, 2018
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