ERA

Download the full-sized PDF of Depth averaged and RANS modeling of open channel flowDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R3T60C

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Graduate Studies and Research, Faculty of

Collections

This file is in the following collections:

Theses and Dissertations

Depth averaged and RANS modeling of open channel flow Open Access

Descriptions

Other title
Subject/Keyword
open channel flow model
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Zobeyer , A T M HASAN
Supervisor and department
Steffler, Peter (Civil and Environmental Engineering)
Examining committee member and department
Adeeb, Samer (Civil and Environmental Engineering)
Hicks, Faye (Department of Civil and Environmental Engineering)
Lange, Carlos (Mechanical Engineering)
Jin, Yee-Chung (Faculty of Engineering, University of Regina)
Department
Department of Civil and Environmental Engineering
Specialization

Date accepted
2011-12-09T21:38:14Z
Graduation date
2012-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
This study focuses on two issues of open channel flow modeling. First the convergence behavior of preconditioned Krylov subspace methods: Generalized Minimal Residual (GMRES) and Bi-Conjugate Gradient Stabilized (BiCGSTAB) is investigated for the open channel flow model River2D with Jacobi, Symmetric Gauss-Seidel (SGS) and Incomplete Lower Upper (ILU) factorizations with different levels of fill as preconditioners. A novel technique is developed where a matrix obtained from a lower time step than the simulation time step is used to compute the ILU factors. This technique increases the robustness and efficiency of the ILU preconditioners significantly. Applying this technique to ILU, the performance of preconditioned GMRES and BiCGSTAB are compared. In most cases ILU with no fill is found to be the most efficient preconditioner. A test to investigate the effect of mesh refinement on the convergence of the new ILU preconditioned solvers also shows promising results. The second issue concerns with a coupled depth averaged (DA) and Reynolds averaged Navier-Stokes (RANS) model developed for open channel flow with or without the assumption of hydrostatic pressure. Initially the water surface and DA velocity are estimated by a DA model neglecting non-uniform velocity and non-hydrostatic pressure. Then in the RANS model, the horizontal momentum and the continuity equations are solved for the horizontal and vertical velocity respectively with the water surface as a fixed zero pressure boundary. For the non-hydrostatic RANS model the pressure Poisson equation is solved for the non-hydrostatic pressure. A correction term is introduced in the RANS horizontal momentum equations for mass balance. Once the RANS model results are available, DA model results can be updated iteratively by incorporating the effects of non-uniform velocity and non-hydrostatic pressure. First the model is developed for two dimensional plane flow and verified against the experimental results of flow development, flow over a symmetric hump and a dune with good results and excellent computational efficiency. Then the model is extended and tested for three dimensional flow with promising results.
Language
English
DOI
doi:10.7939/R3T60C
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.
Citation for previous publication

File Details

Date Uploaded
Date Modified
2014-04-29T17:54:39.802+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (PDF/X)
Mime type: application/pdf
File size: 1796380
Last modified: 2015:10:12 19:11:53-06:00
Filename: Zobeyer_A T M Hasan_Spring 2012.pdf
Original checksum: f8f923f17ff050a72d1b5fbbda26e12c
Activity of users you follow
User Activity Date