Turbulent flows : prediction, modeling and analysis / Zied Driss, editor.

Format:

Book

Contributor:

Driss, Zied.

Series:

Physics research and technology.

Engineering tools, techniques and tables.

Physics research and technology

Engineering tools, techniques and tables

Language:

English

Subjects (All):

Turbulence.

Physical Description:

1 online resource (266 p.)

Edition:

1st ed.

Place of Publication:

Hauppauge, N.Y. : Nova Science Publishers, Inc., 2013.

Language Note:

English

Summary:

Turbulent flow means fluid flow in which the fluid undergoes irregular fluctuations. Understanding the turbulent behavior in flowing fluids is one of the most intriguing and important problems that have been the focus of research for decades due to its great importance in a variety of engineering applications. Common examples of turbulent flow include atmospheric and ocean currents, flow through turbines and pumps, blood flow in arteries, oil transport in pipelines, lava flow, and the flow in boat wakes and around aircraft wing tips, etc. In the present book, we focus on areas of current turbulence research. Recent progress on modeling and analysis of turbulent flows is reviewed, and likely directions for future research on these topics are indicated. This text is unusual in as much as it provides both general commentaries as well as recent specialized developments in the field of turbulence modeling.

Contents:

Intro

TURBULENT FLOWS

Contents

Preface

Turbulent Flows: Prediction, Modeling and Analysis

On Analytical Solutions to the Three-Dimensional Incompressible Navier-Stokes Equations with General Forcing Functions and Their Relation to Turbulence

1. Introduction

2. Problem Formulation

2.1. The Formulation for Velocity and the Pressure Relation

2.2. The Formulation for Velocity

3. The Analytical Solutions

3.1. The Solution for the Riccati Equation

3.2. The Complete Solution

4. Integral Evaluation of Analytical Solutions

5. The Onset of Turbulence

5.1. The Non Existence of Trivial Solutions

6. Solution Examples and Discussions

Conclusion

References

Large-Eddy Simulation of Turbulence-induced Aero-Optical Effects in Free Shear and Wall Bounded Flows

Abstract

Development of a New Curvature Law of the Wall for Internal Swirling Axial Flows

Nomenclature

2. Methods

2. 1. Curvature Law Derivation

2. 2. Numerical Solution

2.3. Analytical Approximation

3. Results and Discussion

3. 1. Consistency

3. 2. Effect of Curvature Radius

3. 3.Effect of Shear Stress Ratio, σ

3. 4. Comparison with Measurements

I. Convex-Gillis and Johnston [8]

II. Concave-so and Mellor [6]

III. Concave-Morrison Et Al. [37]

4. Application

4. 1.Curvature Wall Function Formulation

4. 2. Grid Independence Testing

4. 3. Comparison with LDA Measurement of Swirl Velocity

4. 4. Comparison with Measurement of Damping Coefficient

On Noise Prediction from a Compact Region of Turbulence in an Infinite Circular Hard-Walled Duct

Institute of Hydromechanics

of the National Academy of Sciences of Ukraine,

Kyiv, Ukraine

Introduction

1. Formulation of the Problem.

2. Acoustic Field

2.1. Acoustic Density and Pressure

2.2. Green's Function

2.3. Acoustic Power

2.4. General Comments

3. Dominant Contribution of Quadrupoles

3.1. Large Eddies

3.2. Small Eddies

3.2.1. Low Frequencies

3.2.2. High Frequencies

4. Dominant Contribution of Dipoles

4.1. Large Eddies

4.2. Small Eddies

4.2.1. Low Frequencies

4.2.2. High Frequencies

Computer Simulation of Turbulent Flow Generated by a Deformed Anchor Impeller

2. Governing Equations

2. 1. Fluid Fields

2. 2. Structure elds

2. 3. Fluid-Structure Interface

3. Computational Simulation

3. 1. Coupling Algorithm

3. 1. 1. CSD Code

3. 1. 2. CFD Code

3. 1. 3. Coupling Interface

3. 2. Update Mesh of Fluid Domain

4. Simulation Results

4. 1. Hydrodynamic Studies

4. 1. 1. Flow Patterns in R-Θ Plane

4. 1. 2. Flow Patterns in the R-Z Plane

4. 1. 3. Axial Profiles of the Radial Velocity Component

4. 1. 4. Distribution of the Turbulent Kinetic Energy in the R-Θ Plane

4. 1. 5. Distribution of the Turbulent Kinetic Energy in the r-Z Plane

4. 1. 6. Distribution of Dissipation Rate of the Turbulent Kinetic Energy in the r-Θ Plane

4. 1. 7. Distribution of Dissipation Rate of the Turbulent Kinetic Energy in the r-z Plane

4. 1. 8. Distribution of the Turbulent Viscosity in the r-Θ Plane

4. 1. 9. Distribution of the Turbulent Viscosity in the r-z Plane

4. 1. 10. Comparison with Anterior Results

4. 2. Static Studies

Turbulent Flow Structures for Different Roughness Conditions of Channel Walls: Results of Experimental Investigation in Laboratory Flumes

2. Experimental Apparatus

3. Horizontal Turbulent Structures.

3. 1. Occurrence Frequency of Events

3. 2. Correlation and Conditional Averaging: Effect of the Side-Walls Roughness

Study of Turbulent Flow on an Open Circuit Wind Tunnel

2. Experimental Device

3. Numerical Method

3.1. CFD Code

3.1.1. Pre-Processor

3.1.2. Solver

3.1.3. Post Processor

3.2. Mathematical Formulation

3.3. Boundary Conditions

3.4. Meshing Choice

4. Numerical Results

4.1. Velocity Vectors

4.2. Magnitude Velocity

4.3. Static Pressure

4.4. Dynamic Pressure

4.5. Turbulence Kinetic Energy

4.6. Dissipation Rate of the Turbulence Kinetic Energy

4.7. Turbulent Viscosity

5. Comparison between Numerical

and Experimental Results

Color Doppler Ultrasound (C. D. U. S.) Analysis of Turbulent Flow in Three Different Animal Models

1. 1. Atherosclerosis

1. 2. The Complex Rheology of Blood

2. Material and Methods

2. 1. Stenosis Model

2. 1. 1. Animals and Experimental Design

2. 1. 2. Aortic Stenosis

2. 1. 3. Animal Surgery

2. 1. 4. Doppler Ultrasonography

2. 2. Infra-Diaphragmatic Aortic Constriction

2. 2. 1. Experimental Protocol

2. 2. 2. Animal Surgery

2. 2. 3. Doppler

2. 3. Abdominal Aortic Aneurysm Model

2. 3. 1. Experimental Protocol and Surgery

2. 3. 2. Color Doppler Ultrasound

3. Results

3. 1. Plug Stenosis Model

3. 2. Stenosis Model

3. 3. Abdominal Aortic Aneurysm Model

4. Role of Ultrasonography in the Evaluation of Wall Shear Stress

Acknowledgments

Entrainment of Coarse Solid Particles by Energetic Turbulent Flow Events

2. Theoretical Formulation of the Energy Criterion.

2.1. The Need for a New Conceptual Framework Leading to Energy Criterion

2.2. Formulation of the Energy Equations

2.1.1. Entrainment by Saltation

2.1.2. Entrainment by Rolling

3. Experimental Procedure

4. Results

Elastic Effects on the Inviscid Instability of Shear Flows

Index.

Notes:

Description based upon print version of record.

Includes bibliographical references and index.

Description based on print version record.

ISBN:

1-62417-743-3

OCLC:

839302786