Recent Results in Laminar-Turbulent Transition

1. Front Matter

   Pages I-XIII

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2. Invited Lectures

   1. On a Universal Mechanism of Turbulence Production in Wall Shear Flows

      • Y. S. Kachanov

      Pages 1-12

   2. A general framework for stability, receptivity, and optimal control

      • Peter Schmid

      Pages 13-24

   3. The equivalent forcing model for receptivity analysis with application to the construction of a high-performance skin perforation pattern for LFC

      • Fabio P. Bertolotti

      Pages 25-36

3. Transition Mechanisms

   1. DNS Investigations on the Laminar Breakdown in a Three-dimensional Boundary-Layer Flow

      • Peter Wassermann, Markus Kloker

      Pages 37-50

   2. Absolute/Convective Instability Investigation of Primary and Secondary Crossflow Vortices

      • Fabio P. Bertolotti, Stefan Hein, Werner Koch, Andreas Stolte

      Pages 51-62

   3. Direct numerical simulation of the development of asymmetric perturbations at very late stages of the transition process

      • Daniel G. W. Meyer, Ulrich Rist, Siegfried Wagner

      Pages 63-74

   4. Systematic investigations of 3D acoustic receptivity with respect to steady and unsteady disturbances. Experiment and DNS

      • S. Herr, W. Würz, A. Wörner, U. Rist, S. Wagner, A. Ivanov et al.

      Pages 75-90

   5. Three-dimensional steady disturbance modes in the Blasius boundary layer — a DNS study

      • Markus Kloker, Christian Stemmer

      Pages 91-110

4. Transition Prediction

   1. Industrial View on Transition Prediction

      • Géza Schrauf

      Pages 111-122

   2. Nonlinear Nonlocal Transition Analysis — Code Development and Results —

      • Stefan Hein

      Pages 123-134

   3. Direct Numerical Simulation of Instabilities in the Compressible Swept Hiemenz Flow

      • Anne Le Duc, Jörn Sesterhenn, Rainer Friedrich

      Pages 135-148

   4. A Combined Numerical and Experimental Investigation of Transition in a Laminar Separation Bubble

      • M. Lang, O. Marxen, U. Rist, S. Wagner

      Pages 149-164

5. Transition Control

   1. Generation and Control of Oblique Tollmien-Schlichting Waves in a Blasius Boundary Layer

      • J. Frey, U. Knörnschild, R. Buckisch, R. Grundmann

      Pages 165-176

   2. DNS study of discrete suction in a 3-D boundary layer

      • Ralf Messing, Markus Kloker

      Pages 177-188

   3. Active Control of Boundary-Layer Instabilities on an Unswept Wing

      • D. Sturzebecher, W. Nitsche

      Pages 189-202

   4. Numerical investigations of active control of boundary-layer instabilities

      • Christoph Gmelin, Ulrich Rist, Siegfried Wagner

      Pages 203-218

   5. On the potential and the limitations of boundary-layer stabilization via active wave cancellation

      • Holger Opfer, Fabian Evert, Dirk Ronneberger, Friedrich-Reinhard Grosche

      Pages 219-230

6. Natural Transition and Measurement Techniques

   1. High Resolution Boundary Layer Profile Sensors

      • V. Strunck, M. Borys, T. Buschmann, H. Müller, D. Dopheide

      Pages 231-241

   2. Propagation of Tollmien-Schlichting Waves in a Wing Boundary Layer

      • Arne Seitz, Karl-Heinz Horstmann

      Pages 243-254

Methodic investigations of laminar-turbulent transition in wall-bounded she­ ar flows under controlled conditions are essential for untangling the various complex phenomena of the transition process occurring in flows at practical conditions. They allow understanding of the instability processes of the la­ minar flow, and thus enable the development of tools for flow control. On the one hand the laminar flow regime can be extended by delaying transition to reduce viscous drag, and on the other hand large-scale flow disturbances or transition can be forced in order to enhance momentum and mass ex­ change. Thus flow separation can be prevented, or mixing of fuel and air in combustion engines enhanced, for instance. The "DFG Verbund-Schwerpunktprogramm Transition" - a cooperative priority research program of universities, research establishments and indu­ stry in Germany - has been launched in April 1996 with the aim to explore transition by a coordinated use, development and validation of advanced experimental techniques and theoretical/numerical simulation methods, bin­ ding together all the appropriate resources available in Germany. At the very beginning of the six-year research period specifically selected test problems were to be investigated by various theoretical and experimental methods to identify and possibly rule out inadequate numerical or experimental methods. With respect to experiments it was planned to use multi-sensor-surface measuring techniques, the infrared measuring technique, and particle image velocimetry (PlV) in addition to hot-wire techniques to get instantaneous images of flows in sections, on surfaces, or within the complete flow field.

• Boundary-Layer Flow
• Flow Control
• Free-Flight Measurements
• Laminar Instability
• Profil
• Transition to Turbulence
• Transitional Flow
• Transitional Structures
• mechanics
• spaceflight
• stability

• Institut für Aerodynamik und Gasdynamik, Universität Stuttgart, Stuttgart, Germany

  Siegfried Wagner, Markus Kloker, Ulrich Rist

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