Turbulence Management and Relaminarisation

1. Front Matter

   Pages I-XXIII

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2. Wall-Bounded Flows

   1. Front Matter

      Pages 1-1

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   2. Structure

      1. Documentation of Turbuience Producing Structures in Regular and Manipulated Turbulent Boundary Layers

         • H. M. Nagib, C. E. Wark, Y. G. Guezennec

         Pages 3-22

      2. Measurements in a Synthetic Turbulent Boundary Layer

         • J. H. Arakeri, D. E. Coles

         Pages 23-36

      3. A Unified View of the Origin and Morphology of the Turbulent Boundary Layer Structure

         • K. R. Sreenivasan

         Pages 37-61

   3. Outer Layer Devices

      1. Evaluation of Drag Reduction by Turbulence Control Devices

         • K. S. Yajnik, S. Sundaram, R. Sivaram

         Pages 63-68

      2. Turbulent Boundary Layer Manipulation and Modelling in Zero and Adverse Pressure Gradients

         • A. M. Savill

         Pages 69-83

      3. Computational and Experimental Studies of LEBUS at High Device Reynolds Numbers

         • Arild Bertelrud, R. D. Watson

         Pages 85-96

      4. Blade Manipulators in Channel Flow

         • A. Prabhu, B. Vasudevan, P. Kailasnath, R. S. Kulkarni, R. Narasimha

         Pages 97-107

   4. Surface Manipulation

      1. On the Possibility of Drag Reduction with the Help of Longitudinal Ridges in the Walls

         • A. Dinkelacker, P. Nitschke-Kowsky, W.-E. Reif

         Pages 109-120

      2. Direct Drag and Hot-Wire Measurements on Thin-Element Riblet Arrays

         • S. P. Wilkinson, B. S. Lazos

         Pages 121-131

      3. Viscous Drag Reduction using Streamwise Aligned Riblets: Survey and New Results

         • J. M. Wallace, J.-L. Balint

         Pages 133-147

      4. The Wall-pressure Fluctuations of Modified Turbulent Boundary Layer with Riblets

         • Kwing-So Choi

         Pages 149-160

      5. Turbulence Management by Groove Roughness

         • I. Tani, H. Munakata, A. Matsumoto, K. Abe

         Pages 161-172

      6. A Case for Turbulence Management by Imposed Wall Excitation for Fully Developed Turbulent Flows — a Numerical Study

         • T. K. Sengupta, G. K. Suryanarayana, S. Selvarajan

         Pages 173-184

3. Transition

   1. Front Matter

      Pages 185-185

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   2. Dynamics

      1. The Nature of Oblique Instability Waves in Boundary Layer Transition

         • H. F. Robey

         Pages 187-198

      2. Transition of a Boundary Layer: Controlled Fundamental-subharmonic Interactions

         • T. C. Corke, R. A. Mangano

         Pages 199-213

      3. Three-dimensional Boundary Layer Transition on a Concave-Convex Curved Wall

         • Y. Kohama

         Pages 215-226

      4. Numerical Simulation of Transition in a Decelerating Boundary Layer

         • Kyung Soo Yang, Philippe R. Spalart, Helen L. Reed, Joel H. Ferziger

         Pages 227-238

The last two decades have witnessed an intensifying effort in learning how to manage flow turbulence: it has in fact now become one of the most challenging and prized techno­ logical goals in fluid dynamics. The goal itself is of course not new. More than a hundred years ago, Reynolds already listed factors conducive to laminar and to turbulent flow (including among them curvature and acceleration). Further­ more, it is in retrospect clear that there were several early instances ot successful turbulence management. Examples are the reduction in drag achieved with a ring-trip placed on the front of a sphere or the insertion of a splitter-plate behind a circular cylinder; by the early 1950s there were numerous exercises at boundary layer control. Although many of these studies were interesting and suggestive, they led . to no spectacularly successful practical application, and the effort petered out in the late 1950s. The revival of interest in these problems in recent years can be attributed to the emergence of several new factors. First of all, fresh scientific insight into the structure of turbulence, in particular the accumulated evidence for the presence of significant order in turbulent flow, has been seen to point to new methods of managing turbulence. A second major reason has been the growing realisation that the rate at which the world is consuming its reserves of fossil fuels is no longer negligible; the economic value of greater energy effi­ ciency and lower drag has gone up significantly.

• control
• dynamics
• energy
• management
• turbulence

• California Institute of Technology, Pasadena, USA

  H. W. Liepmann

• National Aeronautical Laboratory and Institute of Science, Bangalore, India

  R. Narasimha

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