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Structure of Turbulence and Drag Reduction : IUTAM Symposium Zurich, Switzerland July 25-28, 1989

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概要 In 1976 a similar titled IUTAM Symposium (Structure of Turbulence and Drag Reduction) was held in Washington . However, the progress made during the last thirteen years as weil as the much promising c...urrent research desired a second one this year. In Washington drag reduction by additives and by direct manipulation of the walls (compliant walls and heated surfaces) were discussed. In the meantime it became evident that drag reduction also occurs when turbulence is influenced by geometrical means, e.g. by influencing the pressure distribution by the shape of the body (airfoils) or by the introduction of streamwise perturbances on a body (riblets). In the recent years turbulence research has seen increasing attention being focused on the investigation of coherent structures, mainly in Newtonian fluids. We all know that these structures are a significant feature of turbulent flows, playing an important role in the energy balance in such flows. However their place in turbulence theories as weil as the factors influencing their development are still poorly understood. Consequently, the investigation of phenomena in which the properties of coherent structures are alte red provides a promising means of improving our understanding of turbulent flows in general.続きを見る
目次 1 structure of Turbulence
Reviews
1. Turbulent boundary layer structure: Progress, status, and challenges
2. A review of vortex structures and associated coherent motions in turbulent boundary layers
Experiments in wall bounded turbulence
3. Hairpin vortices in turbulent boundary layers: The implications for reducing surface drag
4. Production of turbulence in boundary layers and potential for modification of the near wall region
5. Visualisation of the organized motion in a turbulent boundary layer
6. Analysis of experimental data on boundary layer pressure fluctuations in turbulent pipe flow
Experinfients with free shear layers
7. Behaviour of separation bubble with different roughness elements at the leading edge of a flat plate
8. Organized structures and transition in the near field of a plane jet
9. Determination of regular structures in turbulent mixing processes by Raman scattering
Theories of structures of turbulence
10. Wall layer eruptions in turbulent flows
11. Non-linear coherent mode interactions and the control of shear layers
12. Wavenumber-frequency spectral densities of turbulent wall pressure and wall shear fluctuations
13. Quadrant analysis and instantaneous momentum transport - a critical review
14. Artificial control of turbulent mixing layers
2 Drag Reduction in Dilute Polymer Solutions Injections of Concentrated Solutions
Dilute polymer solutions Reviews
15. Dynamics of dilute polymer solutions
16. The effect of dilute polymer solutions on viscous drag and turbulence structure
Theories of drag reduction by dilute polymer solutions
17. Aspects of mechanism in type B drag reduction
18. Change of structures close to the wall of a turbulent flow in drag reducing fluids
Experiments with dilute polymer solutions
19. The influence of polymer additives on the coherent structure of turbulent channel flow
20. Interaction of molecules and turbulent flow in dilute polystyrene solutions
21. A-shaped vortices in dilute polymer solutions
22. Wake flows in dilute polymer solutions
Concentrated polymer solutions
Review
23. Drag reduction caused by the injection of a polymer solution into a pipe flow
Experiments with concentrated polymer solutions
24. Large eddies and polymer strings
25. Friction drag reduction by injection of polyethyleneoxide solution in a turbulent boundary layer through slot and perforated section
3 Drag Reduction by other means
Reviews
26. Drag reduction in surfactant solutions
27. Turbulent drag reduction versus structure of turbulence
Contributions to drag reduction by other means
28. Drag reduction by sand grain roughness
29. Effect of wall suction on the transport of a scalar by coherent structures in a turbulent boundary layer
30. Flow control by suction
31. Inertial interaction of spherical and fibre-like solid particles with turbulent flowing liquids
4 Stability and Computations
Review
32. Hydrodynamic instability and coherent structures in turbulence
stability
33. Effect of three-dimensional surface elements on boundary layer flow
Computation
34. Interpretation of polymer drag reduction in terms of turbulence producing eddies close to the wall
35. Active turbulence control in wall-bounded flow using direct numerical simulations
5 Drag Reduction by Passive Means
Review
36. Drag reduction by passive devices - a review of some recent developments
Lebus
37. Relation between outer structures and wall-layer events in boundary layers with and without manipulation
38. Boundary layer manipulators at high Reynolds numbers
39. Large-scale turbulence structures in a manipulated channel flow
40. Analysis of the wake of an outer layer manipulator
41. Influence of an acoustic field on the flow structure behind a LEBU in a turbulent boundary layer
42. Analysis of the structure of a turbulent boundary layer, with and without a LEBU using light sheet smoke visualizations and hot wire measurements
Riblets
43. The effects of longitudinal roughness elements and local suction upon the turbulent boundary layer
44. Turbulent drag reduction by nonplanar surfaces. A survey on the research at TU/DLR Berlin
45. Drag reduction in pipes lined with riblets
46. Drag reduction mechanisms and near-wall turbulence structure with riblets
47. The bursting process over drag reducing grooved surfaces
48. Riblets in internal flows with adverse pressure gradients
49. Experimental investigation of turbulent boundary layers manipulated with internal devices: riblets
Panel Discussions.
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登録日 2020.06.27
更新日 2020.06.28