CFD modeling of sediment transport with the river model

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CFD modeling of sediment transport with the river model

 

Author: Qin, Jingshu
Title: CFD modeling of sediment transport with the river model
Degree: M.Sc.
Year: 2012
Subject: Sediment transport.
Sediment transport -- Computer simulation.
River channels.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Mechanical Engineering
Pages: xii, 132 leaves : col. ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2516576
URI: http://theses.lib.polyu.edu.hk/handle/200/6683
Abstract: A lot of rivers contain heavy sediment and have serious sediment load just like the Yellow River in China. In recent years because of human activities and climate changes significant changes in runoff and sediment load are monitored at the hydrometric stations on the main stem as well as rivers' tributaries. How a river channel would change with time is a hot topic now. Not only because that it concerns about the topographical change, but also because of that it concerns about the people's living environment near the river. During floods in a River, density of river water usually become higher because of a subsequent increase in the concentration of the suspended sand that the river carries, and causing the river to plunge underneath the free surface of a receiving water basin and form a turbidity current that continues to flow along the bottom. The research and understanding of this complex phenomena is very important, because they form one of the major mechanisms for suspended sand transport from the river into the ocean. Unlike most of the previous numerical investigations on turbidity currents, in this study, we use CFD technique based on a 3D model and multilhase approach to simulate the dynamics and flow structure of turbidity currents. Three models with different shape and size have been constructed. The simulation starts from the simplest model and eventually finishes with the relative model. From all the three models we can get that what the sand would be distributed after washing away from the river bed and how the velocity change with the flowing fluid at different situations. The simulated results can help to understand the basic sediment process in a river.

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