Control of Fluid Flow (Lecture Notes in Control and Information Sciences, 330)

✍ Scribed by Petros Koumoutsakos (editor), Igor Mezic (editor)

• Publisher: Springer
• Year: 2006
• Tongue: English
• Leaves: 239
• Category: Library

✦ Synopsis

Flow Control and Optimization is increasingly incorporated in the design of engineering devices ranging from aircraft and space vehicles to micro?uidic devices. Research in this ?eld aims to integrate knowledge in ?ow physics with theoretical advances and novel experimental capabilities and engineering devices capable of materializing advanced design concepts. In turn controlled ?ow phenomena exhibit a new arrays of physics and open frontiers for further interdisciplinary research in ?uid mechanics and all the engineering domains that it a?ects. This collection of papers in ?ow control, showcases representatives lines of work in the area of ?ow control demonstrating the interdisciplinary character and high scienti?c merit of this ?eld. The authors of these articles are among the pioneering researchers in this ?eld and continue to explore the frontiers in ?ow control and optimization. We hope that this volume, while largely representing work by the authors prior to 2004, contributes in providing an authoritative report on this rapidly changing ?eld.

✦ Table of Contents

Title page
Copyright page
Preface
Acknowledgments
Table of contents
List of Symbols
Control of Weak and Strong Reverse-Flow Regions in Incompressible Turbulent Boundary Layers
1 Introduction
2 Weak Reverse-Flow Regions
2.1 Manipulation of Separation on an Airfoil Under Post-Stall Conditions at High and Low Frequency Excitation
2.1.1 Separation Control Using Fluidic Forcing at High Frequencies
2.1.2 Separation Control Using Fluidic Forcing at Low Frequencies
2.1.3 Separation Control Using Mechanical Forcing at Low Frequencies
2.2 Manipulation of Trailing Edge Separation on an HQ-17 Laminar Airfoil by Means of Two-Dimensional ZNMF-Actuators
2.2.1 The Single Slot Configuration (xslot2/c = 0.66, b = 1.2mm)
2.2.2 Double Slot Configuration (xslot1/c = 0.50, xslot2/c = 0.66)
2.3 Manipulation of Closed Reverse-Flow Regions by Free-Stream Turbulence (FST)
3 Strong Reverse-Flow Regions
3.1 Manipulation of the Closed Reverse-Flow Region Downstream of a Fence
3.2 Manipulation of Strong Reverse FlowCaused by a Trapped Vortex
4 Conclusions
Acknowledgment
References
Aerodynamic Flow Control Using Synthetic Jet Actuators
1 Introduction
2 Experimental Apparatus and Procedure
3 Modification of the Time-Averaged Aerodynamic Performance
4 The Role of the Actuation Frequency
5 Elements of the Dynamics of Flow Reattachment and Separation
6 Pulse-Modulated Reattachment
7 Conclusions
Acknowledgements
References
Control of Mixing and Reactive Flow Processes
1 Introduction
2 Passive Control Methodologies
3 Passive Control Example: The Lobed Fuel Injector
4 Active Control Methodologies
5 Active Control Example: The Acoustically Resonant Dump Combustor
6 Future Directions
Acknowledgments
References
Nonlinear Modeling and Control of Combustion Dynamics
1 Introduction
2 Dynamic Models of Combustion Instability
2.1 Linear Models
2.2 Nonlinear Models of Combustion Oscillations
2.3 Linear Models Using a System Identification Approach
3 Control of Combustion Instability
3.1 Linear Control
3.1.1 Experimental Results
3.2 Time-delay Control
3.2.1 Simulation Results
3.3 Adaptive Control
3.3.1 Model-based Self-tuning Control
3.3.2 Adaptive Time-delay Control
3.3.3 Simulation and Experimental Results
3.3.4 Extremum-seeking Control
3.3.5 Observer-based Control
3.4 Neural Control
4 Summary
Acknowledgements
References
Distributed Control and Observation
1 Introduction
2 The Acoustic Equation
2.1 The Compressed Broken Hamiltonian Flow
2.1.1 The Hamiltonian Flow Inside Ω
2.1.2 Interaction with the Boundary
3 Control and Observation
4 Observation Estimates
4.1 Unstable Observations Estimates
4.2 Propagation Along Rays and High Frequency Estimates
5 Time Reversal Methods and Ergodicity
6 Conclusion
References
Global Boundary Stabilization of 2D Poiseuille Flow∗
1 Introduction
2 Problem Statement
3 Boundary Feedback Laws
4 The Result
5 Proof of Theorem
6 Numerical Simulation
7 Simulations with Only Parts of the Wall Controlled
Acknowledgment
References
Exact Controllability and Feedback Stabilization from a Boundary for the Navier–Stokes Equations
1 Introduction
2 Exact Controllability from the Boundary of the Navier–Stokes System
3 Ozeen Equations
3.1 Formulation of the Problem
3.2 Preliminaries
4 Stabilization of the Ozeen Equation
4.1 Theorem on Extension
4.2 Result on Stabilization
4.3 Feedback Property
5 Stabilization of 2D Navier–Stokes Equations
5.1 Formulation of the Stabilization Problem
5.2 Invariant Manifolds
5.3 Final Results
References
Vortex-based Control Algorithms
1 Introduction
2 Review of the Vortex Control Research
2.1 Simple Vortical Configurations
2.2 Vortex/Solid Body Interaction
2.3 Control of the Wake Behind a Bluff Body
2.4 Vortex Dynamics in Shear and Mixing Layers
2.5 Vortex Control for Improved Swimming Efficiency
2.6 Topics Left Out of the Scope
3 Towards Control of Vortex Merging
4 Control of a Pair of Point Vortices
4.1 Averaging for a Co-Rotating Vortex Pair
4.2 Two Vortices Controlled by a Strain Field
4.3 Two Vortices in a Source/Sink Field
5 Control of a Pair of Vortex Patches
5.1 Flat Coordinates
5.2 Adiabatic Control
Conclusions
References
Flow Optimization Using Stochastic Algorithms
1 Introduction
2 Multi-Objective Optimization in Combustion Processes
3 Cylinder Drag Minimization
4 Aerodynamic Profile Design
5 Micromixer
6 Microchannel Flow
7 Jet Mixing
8 Aircraft Trailing Vortex Destruction
9 Summary and Conclusions
References