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Title of Thesis

Investigation Of Various Sediment And Flow Parameters Upon Three Dimensional Flow Using Numerical Model

Author(s)

Usman Ghani

Institute/University/Department Details
Department Of Civil Engineering, Faculty Of Civil & Environmental Engineering / University Of Engineering & Technology, Taxila
Session
2010
Subject
Engineering Civil ( Water Resources Engg)
Number of Pages
206
Keywords (Extracted from title, table of contents and abstract of thesis)
Sediment, Parameters, transport, modeling, Flood, flows, Investigation, Numerical, techniques, Turbulent, kinetic, energy, Dimensional, Numerical, Various

Abstract
The aim of this research work was to investigate and increase the understanding three dimensional flow behavior under changing conditions of flow and sediments.The goal was achieved by using a 3D Computational Fluid Dynamics model FLUENT.
The geometry selected for this study is that of a meandering compound channel.The parameters which were changed in this research work include the width of floodplain along with main channel width, overbank flow depth, incoming discharge, bed slope of the main channel and floodplains and roughness of the channel and floodplains.The research work was conducted by using different turbulence models.Among them are standard k  , Re-normalization Group (RNG) theory based k  and k  turbulence models. These three models were applied for one case. Once the capability of k  model was established after comparison with results of other models, then only k  was used in the remaining part of the work.The data obtained from a physical model study in the laboratory was used for the validation of simulated results.The validation was done through a comparison of observed and calculated
values of depth averaged velocities, total discharge at a section & point velocities.After validation, the CFD model was used to predict and investigate those aspects of flow which were difficult to get through experiments and for which experimentation was not conducted in the laboratory.These aspects include turbulence intensity, turbulent kinetic energy, pressure distribution on different cross sections of the channel and surface velocity magnitudes.As far as the sediments study is concerned, the Lagrangian particle tracking technique was used to predict the changes in bed levels at apex of the meander wavelength.Sediment particles with different diameters were used for this purpose.
A total of eight flow cases were considered for the study of flow field.Each case varies from the other on the basis of (i) geometry or (ii) bed slope or (iii) depth of overbank flow or a combination of these.This work also proved the capability of standard k  turbulence closure models in prediction of 3D overbank flows.

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5,884 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 CONTENTS

 

 
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2

1

INTRODUCTION

1.1 Statement of the problem
1.2 Objective
1.3 Organization of the thesis

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3 2 LITERATURE REVIEW

2.1 Experimental Work
2.2 Numerical Work
2.3 Various Aspects of Natural Channel Flows
2.4 Relevance of the Work with Local Rivers
2.5 Flow Behavior
2.6 Floodplain Roughness
2.7 Provision of Roughness in Numerical Models

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4 3 NUMERICAL TECHNIQUES AND THEIR UTILIZATION IN 3D FLOWS

3.1 Computational Fluid Dynamics
3.2 Different Numerical Techniques
3.3 Direct Numerical Simulation (DNS)
3.4 Large Eddy Simulation (LES)
3.5 Detached Eddy Simulation (DES) model
3.6 Reynolds-Averaged Navior-Stokes Equations (RANS)
3.7 The Closure Problem
3.8 Boussinesq Approach and Reynolds Stress Model Approach

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186 KB
5 4 NUMERICAL SOLUTION METHODOLOGY

4.1 Discritization
4.2 Governing Equations
4.3 Time-Averaging of Turbulent Flows and Sediment Transport
4.4 General 3D Flow and Sediment Transport Equations
4.5 Boundary Conditions
4.6 Types of Grids
4.7 Different Properties of Numerical Methods
4.8 Numerical Schemes
4.9 Numerical Algorithms

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284 KB
6 5 NUMERICAL MODELING OF THREE DIMENSIONAL FLOWS

5.1 The Software FLUENT
5.2 Numerical Simulation work with other CFD Codes
5.3 Different Aspects of FLUENT
5.4 The Mesh Generator GAMBIT
5.5 The Solution Sequence
5.6 Boundary Conditions used in this Work
5.7 Meshing the Geometry
5.8 Fully Developed Flow

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7 6 RESULTS AND DISCUSSIONS


 

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8 7 NUMERICAL SIMULATION FOR SEDIMENT TRANSPORT

7.1 Different Properties of the Sediments
7.2 Armoring and Sorting
7.3 Numerical Technique and Procedure
7.4 Predictions of Sediment Transport and Deposition

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9 8 CONCLUSIONS AND RECOMMENDATIONS

8.1 Conclusions
8.2 Recommendations

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10 9 REFERENCES

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