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Permanent link (DOI): https://doi.org/10.7939/R3959CG70

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Three-Dimensional Numerical Investigation on Velocity Field and Mixing Characteristics at Channel Junctions Open Access

Descriptions

Other title
Subject/Keyword
Channel confluence
Mixing
Transverse mixing coefficient
Numerical Model
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Chen, Xue
Supervisor and department
Steffler, Peter M. (Civil and Environmental Engineering)
Zhu, David Z. (Civil and Environmental Engineering)
Examining committee member and department
Steffler, Peter M. (Civil and Environmental Engineering)
Lang, Carlos (Mechanical Engineering)
Zhu, David Z. (Civil and Environmental Engineering)
Department
Department of Civil and Environmental Engineering
Specialization
Water Resources Engineering
Date accepted
2014-09-23T09:07:48Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
Channel confluence is an important component in river systems. The flow dynamics and mixing processes associated with such geometry are highly three-dimensional and complicated. In this study, a commercial software, ANSYS CFX, was employed to investigate the flow structures and mixing characteristics at channel confluences using steady-state three-dimensional numerical method. The results indicated that the flow converging could not produce rapid mixing within the confluence or immediately downstream because of locally confined secondary current. However, with the secondary current growing downstream, the mixing rate was accelerated. Transverse mixing coefficients were determined for channel junctions with different confluent angles and discharge ratios using the generalized method of moments. This research provided the insight view on the curvature-induced secondary circulation at channel confluence and proposed the corresponding mixing rate.
Language
English
DOI
doi:10.7939/R3959CG70
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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