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Advances in Modelling and Numerical Simulation of Sediment Transport in Shallow Water Flows

ROWAN, THOMAS,SIMON,LEACROFT (2019) Advances in Modelling and Numerical Simulation of Sediment Transport in Shallow Water Flows. Doctoral thesis, Durham University.

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A class of novel models for sediment transport, for which multilayer fluid models are combined with a multi-sediment method, is developed and analysed. Turbulent effects in both water flow and sediment transport are also accounted for in the presented models. The aim of this thesis is to advance fast and accurate techniques that overcome some of the assumptions limiting current sediment transport models of this type. To the best knowledge of the author, this is the first time a two-dimensional multilayer model has been used for modelling and simulation of sediment transport. Sediment transport methods using the Shallow Water Equations (SWEs) are reviewed and some of the limiting assumptions are highlighted. Fast methods for modelling sediment transport with multiple sediments are developed in both one space dimension (1D) and two space dimensions (2D).
A new formulation for multilayer SWEs is expanded in 1D and 2D to also include sediment transport. Turbulence modelling with the well-established k-epsilon$ model is also evolved to deal with a multilayer formulation. Each development is tested by itself to quantify its effects and then combined with all the other developments to create the final model. Two second-order accurate solvers are in this thesis: namely a Roe-type solver and a novel Eulerian-Lagrangian formulation. The latter is favoured and is used to solve the complete model, including turbulence and multiple sediment types. This creates a fast and easy-to-implement method that can handle complex flows and irregular bed topographies. The methods are compared to other shallow water systems along with Navier-Stokes results and data obtained from experiments performed in the Department of Engineering at Durham University. Overall, this thesis provides interesting and highly applicable results that add a new avenue of applications to sediment transport in shallow water flows. [math mode missing closing $]

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Keywords:Sediment transport, Multilayer shallow water equations, Multi-sediments, Turbulence modelling, Eulerian-Lagrangian method, Dam-break problems
Faculty and Department:Faculty of Science > Engineering, Department of
Thesis Date:2019
Copyright:Copyright of this thesis is held by the author
Deposited On:01 May 2019 11:45

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