The aim of this Advanced Research Workshop was to bring together Physicists, Applied Mathematicians and Fluid Dynamicists, including very specially experimentalists, to review the available knowledge on the global structural aspects of turbulent flows, with an especial emphasis on open systems, and to try to reach a consensus on their possible relationship to recent advances in the understanding of the behaviour of low dimensional dynamical systems and amplitude equations. A lot has been learned during recent years on the non-equilibrium behaviour of low dimen sional dynamical systems, including some fluid flows (Rayleigh-Benard, Taylor-Couette, etc. ). These are mostly closed flows and many of the global structural features of the low dimensional systems have been observed in them, including chaotic behaviour, period doubling, intermit tency, etc. . It has also been shown that some of these flows are intrinsically low dimensional, which accounts for much of the observed similarities. Open flows seem to be different, and experimental observations point to an intrinsic high dimensionality. However, some of the tran sitional features of the low dimensional systems have been observed in them, specially in the intermittent behaviour of subcritical flows (pipes, channels, boundary layers with suction, etc. ), and in the large scale geometry of coherent structures of free shear flows (mixing layers, jets and wakes).
Reihe
Physics (Continued Within NATO Science Series II: Mathematics, Physics and Chemistry)
268
Sprache
Verlagsort
Verlagsgruppe
Illustrationen
Dateigröße
ISBN-13
978-1-4615-3750-2 (9781461537502)
DOI
10.1007/978-1-4615-3750-2
Schweitzer Klassifikation
Shear Flows: Experimental Observations.- The Mixing Transition in Free Shear Flows. (Invited).- Vortex Shedding from Spheres at Subcritical Reynolds Number in Homogeneous and Stratified Fluid.- Nature of the Görtler Instability: A Forced Experiment.- Dynamics of Large Scale Structures in Turbulent Two Dimensional Wakes.- Vortex Splitting and Shedding Cell Interactions in Wakes Behind Linearly Tapered Cylinders at Low Reynolds Numbers.- Shear Flows: Control Experiments.- Control of Turbulent Shear Flows Via Stationary Boundary Conditions.- The Effects of External Excitation on the Reynolds-Averaged Quantities in a Turbulent Wall Jet.- Control of Organised Structures in Round Jets at High Reynolds Numbers.- Three Dimensional Structure of the Vorticity Field in the Near Region of Laminar, Co- Flowing Forced Jets.- Modelling and Control of Kármán Vortex Streets.- Shear Flows: Numerical Experiments.- Advances and Some Novel Experiments Using Direct Numerical Simulations of Turbulence (Invited).- Bubble Formation in Dense Fluidised Beds.- Three Dimensional Numerical Simulations of Coherent Structures in Free-Shear Flows.- Large-Eddy Simulation of Turbulent Scalar:The Influence of Intermittency.- Thermal Convection at High Rayleigh Numbers in Two Dimensional Sheared Layers.- Closed Flows: Experiments.- Effect of Noise on Bifurcations and Patterns in Dissipative Systems.- Hexagonal Convective Cells.- Theoretical Models: The N-S and Related Equations.- Vortex Dynamics and Turbulence. (Invited).- Control of Turbulent Boundary Layer and Dynamical Systems Theory: An Update.- Kolmogorov Spectra and Intermittency in Turbulence.- An Appraisal of the Ruelle-Takens Route to Turbulence.- Shear Type Instabilities in the Benard Problem.- Interpretation of Invariants of the Betchov-daRios Equations and of the Euler Equations.- Stretching of Vortex Tubes.- Theoretical Models: Amplitude and Model Equations.- Bifurcations and Subcritical Instabilities. (Invited).- Transition to Chaos in Nonlinear Oscillators.- Turbulent Coupled Map Lattices.- Weak and Strong Turbulence in a Class of Complex Ginzburg Landau Equations.- Pattern Formation, External Fields and Fluctuations.- Panel Discussions.- Direct Numerical Simulation or Experiments?.- What are Turbulent Puffs?.- Is This the Theory for These Experiments?.- Organising Committee.- Lecturers.- Participants.
