Active Flow Control II

The interest in the field of active flow control (AFC) is steadily increasing. In - cent years the number of conferences and special sessions devoted to AFC org- ized by various institutions around the world continuously rises. New advanced courses for AFC are offered by the American Institute of Aeronautics and Ast- nautics (AIAA), the European Research Community on Flow, Turbulence and Combustion (ERCOFTAC), the International Centre for Mechanical Sciences (CISM), the von Karman Institute for Fluid Dynamics (VKI), to name just a few. New books on AFC are published by prominent colleagues of our field and even a new periodical, the ‘International Journal of Flow Control’, appeared. Despite these many activities in AFC it was felt that a follow-up of the highly successful ‘ACTIVE FLOW CONTROL’ Conference held in Berlin in 2006 was appropriate. As in 2006, ‘ACTIVE FLOW CONTROL II’ consisted only of invited lectures. To sti- late multidisciplinary discussions between experimental, theoretical and numerical fluid dynamics, aerodynamics, turbomachinary, mathematics, control engineering, metrology and computer science parallel sessions were excluded. Unfortunately, not all of the presented papers made it into this volume. As the preparation and printing of a book takes time and as this volume should be available at the conf- ence, the Local Organizing Committee had to set up a very ambitious time sch- ule which could not be met by all contributors.

This volume is a follow-up of Active Flow Control (Ed. R. King). The contributions to this book were presented at the conterence AFC II, held May 26-28, 2010, at the Technische Universität Berlin.

The interest in the field of active flow control (AFC) is steadily increasing. In - cent years the number of conferences and special sessions devoted to AFC org- ized by various institutions around the world continuously rises. New advanced courses for AFC are offered by the American Institute of Aeronautics and Ast- nautics (AIAA), the European Research Community on Flow, Turbulence and Combustion (ERCOFTAC), the International Centre for Mechanical Sciences (CISM), the von Karman Institute for Fluid Dynamics (VKI), to name just a few. New books on AFC are published by prominent colleagues of our field and even a new periodical, the ‘International Journal of Flow Control’, appeared. Despite these many activities in AFC it was felt that a follow-up of the highly successful ‘ACTIVE FLOW CONTROL’ Conference held in Berlin in 2006 was appropriate. As in 2006, ‘ACTIVE FLOW CONTROL II’ consisted only of invited lectures. To sti- late multidisciplinary discussions between experimental, theoretical and numerical fluid dynamics, aerodynamics, turbomachinary, mathematics, control engineering, metrology and computer science parallel sessions were excluded. Unfortunately, not all of the presented papers made it into this volume. As the preparation and printing of a book takes time and as this volume should be available at the conf- ence, the Local Organizing Committee had to set up a very ambitious time sch- ule which could not be met by all contributors.

Airfoils.- Transitory Control of Dynamic Stall on a Pitching Airfoil.- Unsteady Lift Suppression with a Robust Closed Loop Controller.- Active Flow Control on a S10 Glider Configuration.- Numerical Investigation of Active Flow Control Applied to an Airfoil with a Camber Flap.- On Amplitude Scaling of Active Separation Control.- Lock-On to a High-Lift State with Oscillatory Forcing in a Three-Dimensional Wake Flow.- Active Flow Control on an Industry-Relevant Civil Aircraft Half Model.- Numerical Investigation of Spatially Distributed Actuation on a Three-Element High-Lift Configuration.- Robust Closed-Loop Lift Control on an Industry-Relevant Civil Aircraft Half Model.- Turbomachines.- Closed Loop Blade Tone Control in Axial Turbomachines by Flow Induced Secondary Sources in the Blade Tip Regime.- Turbofan Tone Noise Reduction by Flow-Induced Unsteady Blade Forces.- Experimental AFC Approaches on a Highly Loaded Compressor Cascade.- Robust Control in Turbomachinery Configurations.- URANS Simulations of Active Flow Control on Highly Loaded Turbomachinery Blades.- Bluff Bodies.- Application of Active Flow Control on Generic 3D Car Models.- Simulation of Active Drag Reduction for a Square-Back Vehicle.- Model Predictive Control for a 2D Bluff Body Under Disturbed Flow Conditions.- Burner and Cavities.- Closed-Loop Control of an Unstable Open Cavity.- A Zero-Mach Solver and Reduced Order Acoustic Representations for Modeling and Control of Combustion Instabilities.- Modeling the Fuel/Air Mixing to Control the Pressure Pulsations and NOx Emissions in a Lean Premixed Combustor.- Model Reduction and Feature Extraction.- Reduced Order Modeling Using Proper Orthogonal Decomposition (POD) and Wavenet System Identification of a Free Shear Layer.- Turbulence Control Based onReduced-Order Models and Nonlinear Control Design.- A New Discretization Framework for Input/Output Maps and Its Application to Flow Control.- Extraction of Coherent Structures from Natural and Actuated Flows.- Optimal Flow Control.- Optimized Waveforms for Feedback Control of Vortex Shedding.- Optimal Boundary Control Problems Related to High-Lift Configurations.