IUTAM Symposium on Mechanics of Passive and Active Flow Control : Proceedings of the IUTAM Symposium Held in Göttingen, Germany, 7–11 September 1998

The call for papers for the rUTAM-Symposium on Mechanics of Passive and Active Flow Control brought an overwhelming response of applications for contributions. Fi­ nally 12 invited lectures, 48 papers and 23 posters were selected by thc Scientific Com­ mittee to be presented in the conference. 58 papers are published in this volume. Due to the limited number of pages available, poster presentations could not be considered for publication. The editors would like to thank all the members of the Scientific Committee for their very valuable assistance. The papers presented at the rUT AM Symposium were classified under three groups de­ voted to • Passive Control Methods, • Active Control Methods and • Control Concepts. This was done to contrast at first between the passive techniques where the control power is mainly supplied by the flow itself and the active techniques where the power is pro­ vided by external sources; the third group was devoted to control concepts for presenting methods of control theory and new techniques of flow control. Front Matter....Pages i-xiv Opening Address....Pages 1-4 Dynamics and Control of Near-Wall Coherent Structures....Pages 5-14 Passive Control Methods: Riblets, Vortex Generators and Self-Activating Flaps....Pages 107-108 Natural Riblets....Pages 109-114 The Flow Over Riblets: Velocity Measurements with Hot-Film Probes....Pages 115-120 Numerical Investigation of Flow Around a Vented Sphere....Pages 121-126 Flow Physics Involved in Shock Wave/Boundary Layer Interaction Control....Pages 15-22 Shock/Boundary Layer Control by Various Concepts....Pages 23-28 Expansion Shoulder Bump for Wing Section Viscous / Wave Drag Control....Pages 29-34 Euroshock I and II: A Survey....Pages 35-42 A Review of Flow Control Research at Dera....Pages 43-56 Assessment of the Capability of Drag Reduction of the Shock Control Device ‘SC Bump’ on Airfoil Flows and Application Aspects on Wings....Pages 57-62 Passive Control of Buffet Excitation....Pages 63-68 Enhanced Thrust-Efficiency of Overexpanded Nozzles by Passive Venting....Pages 69-74 The Control of Compressible Dynamic Stall Using Adaptive Airfoils....Pages 75-80 Application of Micro-Vortex Generators for Turbulent Flow Separation Control....Pages 81-88 Fundamental Investigations of the Flow About Devices Suitable for Use in Flow Control....Pages 89-94 A Novel Use of Vortex Generators for Separation Control in the Corner Between a Wall and a Wing....Pages 95-97 Windtunnel Experiments with Artificial Bird Feathers for Passive Separation Control on Airfoils....Pages 99-100 A Method of Mixing Process Control in a Shear Layer of a Supersonic Nonisobaric Jet....Pages 101-106 Drag Reduction of a Sphere at Supercritical Reynolds Numbers Using Passive Ventilation....Pages 127-132 Separation Control of a Thin Airfoil by Projectile Vortex-Rings....Pages 133-138 Turbulence Reduction in the Initial Region of a Plane Jet Using Passive Control....Pages 139-144 Influence of Riblets on a Supersonic Wake Flow....Pages 145-150 Receptivity Issues for Laminar-Flow Control....Pages 151-158 Control of Boundary Layer Transition at High Fst by Localized Suction....Pages 159-164 Experiments on the Control of Crossflow Instability with the Aid of Suction Through Perforated Walls.....Pages 165-170 Control of Crossflow Instability Field by Selective Suction System....Pages 171-176 Control of the Laminar-Turbulent Transition by Suction of the Boundary Layer in 2D Flow.....Pages 177-182 Control of Transition in 3-D Boundary Layers....Pages 183-188 Transition Control Using Leading Edge Roughness for the Onera-D Wing....Pages 189-194 Active Flow Control by Micro Systems....Pages 195-202 Strategy of the Flow Mems Control at Laminar-Turbulent Transition in a Boundary Layer....Pages 203-208 Manipulating Coherent Structures by Heat in a Boussinesq Jet....Pages 209-216 Boundary Layer Control Over an Active Ribleted Surface....Pages 217-222 Control of Coherent Structures Shedding and Generation of Sound in Bluff-Body Wake Flow....Pages 223-228 Oscillations of Solid Surfaces Versus Sound and Oscillatory Suction in Flow Control....Pages 229-236 Theoretical and Computational Study of the Wake Control Problem....Pages 237-242 Moving Surface Separation Control for Airfoil at High Angles of Attack....Pages 243-248 Separation control on an airfoil under post-stall conditions by mechanical excitation....Pages 249-254 Effect of Microbubble Cluster on Turbulent Flow Structure....Pages 255-260 Stability Analysis of the Wake Control Problem....Pages 261-266 Control of the Periodic Wake Behind a Plane Blunt Base....Pages 267-272 Aerodynamic Flow Control of Bluff Bodies Using Synthetic Jet Actuators....Pages 273-278 Reduction of Unsteady Forces on Bluff Bodies Using Rotating Control Cylinders....Pages 279-284 Moving Surface Boundary-Layer Control as Applied to Slender and Bluff Bodies....Pages 285-290 Flow Control by Periodic Forcing: Acoustic Excitation and Local Injection of Artificial Disturbances....Pages 291-298 Control of leading-edge separation from an airfoil by internal acoustic excitation and self-induced resonances....Pages 299-304 Control of Pipe Flow by Use of an Aeroacoustic Instability....Pages 305-310 Near Wall Turbulence Reaction to a Localized Time-Periodical Blowing....Pages 311-316 Manipulation of Trailing Edge Separation on an Aerofoil Using a Periodic Cross-Flow....Pages 317-322 Transition Control of Supersonic Boundary Layer on Flat Plate....Pages 323-328 Active Control of Turbulent Boundary Layers for Drag Reduction....Pages 329-336 The Effects of Flow Instabilities on the Active Control of Separation....Pages 337-342 Active Control of Kelvin-Helmholtz Waves....Pages 343-348 Dynamic Control of the Jet-Edge-Flow....Pages 349-354 A Low-Order Model-Following Strategy for Active Flow Control....Pages 355-366 Back Matter....Pages 367-386 This volume contains the Proceedings of the IUTAM Symposium on Mechanics of Passive and Active Flow Control, held at the DLR, Göttingen, in September 1998. This follows an earlier IUTAM Symposium on Turbulence Management and Relaminarisation which was held in Bangalore in 1987. The last decade has witnessed significant advances and research activity in the area of flow control/management, triggered by technological applications as well as scientific curiosity in understanding the structure of complex flows. This volume contains both review and contributed papers in the area of flow control, with emphasis on fluid dynamical mechanisms underlying different passive and active control techniques used in a variety of flows such as bumps, roughnesses, riblets, vortex generators, suction blowing, sound and MEMS; issues such as new control concepts and control strategies are also addressed. The application areas include drag reduction, transition, turbulence and separation, many relevant to aeronautical systems. This volume is very timely and contains a wealth of information on current research in the broad subject of flow control concepts and applications; it should be of particular interest to scientists, engineers and students pursuing research in flow control.