IUTAM Symposium on Simulation and Identification of Organized Structures in Flows

1. Geostrophic and Stratified Flows

   1. Vortex Wakes in Stably-Stratified Fluids

      • G. R. Spedding

      Pages 163-179

   2. Baroclinic Tripolar Geostrophic Vortices

      • Xavier J. Carton, Stéphanie M. Corréard

      Pages 181-190

   3. Vertical Alignment of Geostrophic Vortices

      • Stéphanie M. Corréard, Xavier J. Carton

      Pages 191-200

   4. The Interaction of a Vortex with a Stable Jet

      • Frédéric O. Vandermeirsch, Xavier J. Carton, Yves G. Morel

      Pages 201-210

2. Topological Aspects

   1. Front Matter

      Pages 211-211

      PDF

   2. Streamline Topology of Axisymmetric Flows

      • Morten Brøns

      Pages 213-222

   3. Flow Topology and Tomography for Vortex Identification in Unsteady and in Three-Dimensional Flows

      • Uwe Ch. Dallmann, Heinrich Vollmers, Wen-Han Su

      Pages 223-238

   4. Coherent Structures in Fluids are Topological Torsion Defects

      • R. M. Kiehn

      Pages 239-248

   5. The Vortex Concept and its Identification in Turbulent Boundary Layer Flows

      • L. M. Portela

      Pages 249-258

3. Experimental Techniques

   1. Front Matter

      Pages 259-259

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   2. Coherent Structures Identification in Separated and Free Mixing Layers Using Hot Wires Rake

      • S. Aubrun, H. Ha Minh, H. Boisson, P. Carles, J. Coulomb

      Pages 261-271

   3. 3D Measurement of Vortex Structures in Stratified Fluid Flows

      • A. M. Fincham

      Pages 273-288

   4. DNS of a Turbulent Channel Flow to Guide Vorticity Measurements in the Wall Region

      • P. G. Esposito, T. Zhou, R. A. Antonia, P. Orlandi

      Pages 289-297

   5. Quantitative Planar Imaging of Large Structures Developed Through the Precession of a Jet

      • D. S. Nobes, G. J. R. Newbold, Z. T. Alwahabi

      Pages 299-308

4. Vortical Structures

   1. Front Matter

      Pages 309-309

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   2. Formation of Vortex Rings in Helicopter Rotor Flow Fields

      • O. Inoue, Y. Hattori

      Pages 311-318

   3. Three-Dimensional Vortical Structure and Diffusion Mechanism of an Excited Rectangular Jet

      • K. Toyoda, R. Hiramoto

      Pages 319-328

   4. Identification of Strong, Near-Wall Quasi-Streamwise Vortices and Their Behavior

      • K. Tsujimoto, Y. Miyake

      Pages 329-338

   5. Three Dimensional Coherent Structures in the Flow Around A Circular Cylinder by Direct Numerical Simulation

      • H. Persillon, M. Braza, C. Williamson

      Pages 339-351

5. POD, LSE and Other Techniques

   1. Front Matter

      Pages 353-353

      PDF

The dynamics of transitional and turbulent flows is often dominated by organized structures with a life-time much longer than a characteristic time­ scale of the surrounding small-scale turbulence. Organized structures may appear as secondary flows as a result of an instability but they persist in turbulent flows. They manifest themselves as eddies or localized vortices and play an important role in e.g. mixing and transport processes. Al­ though the existence of organized structures has been revealed by many experiments and by numerical simulations they are somewhat elusive, as there is no consensus on how to define them and technically how to detect them. In recent years several identification tools for analysing complex flows have been developed. These tools include various versions of the Proper Orthog­ onal Decomposition (POD) technique, wavelet transforms, pattern recogni­ tion, etc. At the same time, improvements in experimental techniques have made available data that further necessitate efficient detection methods. A prominent example is the Particle Image Velocimetry (PIV) technique from which complex spatio-temporal flow data can be obtained. An interesting feature of some of the identification techniques is that they form the basis for reduced models by which dynamical processes can be studied in details. From studies of dissipative dynamical systems it has been revealed that, in phase space, transitional and turbulent flows can be identified by their low-dimensional behaviour. Thus, employing data from experiments or nu­ merical simulations to form modes residing on finite-dimensional attractors may dramatically reduce computing costs.

• dynamics
• mixing
• stability
• topology
• turbulence
• turbulent flow
• vortices

`I have read this book with great interest and found that most papers provide something new, inspiring, and applicable in hydraulic research. In summary, this book is a valuable source of information that should stimulate new approaches and developments in hydraulic research, especially in studying the physics of hydraulic resistance, sediment transport, flow-biota interactions, and their modeling.'
Journal of Hydraulic Engineering (February 2001)

• Department of Energy Engineering, Technical University of Denmark, Lyngby, Denmark

  J. N. Sørensen

• LEGI-IMG, Domaine Universitaire, Grenoble, France

  E. J. Hopfinger

• Mechanical Engineering Department, New Jersey Institute of Technology, Newark, USA

  N. Aubry

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