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Fluids 2019, 4(1), 18; https://doi.org/10.3390/fluids4010018

A Three-Dimensional Flow and Sediment Transport Model for Free-Surface Open Channel Flows on Unstructured Flexible Meshes

1,*
and
2,3
1
Technical Service Center, U.S. Bureau of Reclamation, Denver, CO 80225-007, USA
2
Water Resources Planning Institute, Water Resources Agency, Taichung 413, Taiwan
3
Department of Civil Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
*
Author to whom correspondence should be addressed.
Received: 7 December 2018 / Revised: 20 December 2018 / Accepted: 20 January 2019 / Published: 24 January 2019
(This article belongs to the Special Issue Free surface flows)
Full-Text   |   PDF [5713 KB, uploaded 24 January 2019]   |  

Abstract

Three-dimensional (3D) hydrostatic-pressure-assumption numerical models are widely used for environmental flows with free surfaces and phase interfaces. In this study, a new flow and sediment transport model is developed, aiming to be general and more flexible than existing models. A general set of governing equations are used for the flow and suspended sediment transport, an improved solution algorithm is proposed, and a new mesh type is developed based on the unstructured polygonal mesh in the horizontal plane and a terrain-following sigma mesh in the vertical direction. The new flow model is verified first with the experimental cases, to ensure the validity of flow and free surface predictions. The model is then validated with cases having the suspended sediment transport. In particular, turbidity current flows are simulated to examine how the model predicts the interface between the fluid and sediments. The predicted results agree well with the available experimental data for all test cases. The model is generally applicable to all open-channel flows, such as rivers and reservoirs, with both flow and suspended sediment transport issues. View Full-Text
Keywords: 3D hydraulic model; 3D sediment model; turbidity current; polygonal mesh; hydrostatic assumption 3D hydraulic model; 3D sediment model; turbidity current; polygonal mesh; hydrostatic assumption
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Lai, Y.G.; Wu, K. A Three-Dimensional Flow and Sediment Transport Model for Free-Surface Open Channel Flows on Unstructured Flexible Meshes. Fluids 2019, 4, 18.

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