New Approaches and Concepts in Turbulence

Opening Address.- Session One..- Similarity Laws for Wall Turbulent Flows: Their Limitations and Generalizations.- A Prediction of the Multifractal Model: The Intermediate Dissipation Range.- A New View of Developed Turbulence.- Discussion.- Session Two..- On Vortices And Cascades in Turbulence.- A Dynamical Theory of Cascade in Turbulence and Non-Gaussian Statistics.- Small Scale Vortices in Turbulent Flows.- Discussion.- Session Three..- Spiral Structures in Turbulent Flow.- Solutions of Exact Kinetic Equations for Intermittent Turbulence.- How Important are Direct Interactions between Large and Small Scales in Turbulent Flows.- Discussion.- Session Four..- How Long is the Way from Chaos to Turbulence?.- Vortex Interactions as a Dynamical System.- Finite-dimensional Dynamics and Chaos in Fluid Flows.- Discussion.- Session Five..- The Origins of Turbulence.- Role of Algebraic Instability in Transition and Turbulence.- Active Control of Skin Friction and Separation in Certain Class of Wall-Bounded Flows.- Rapid Distortion Theory and the Structure of Turbulence.- Discussion.- Session Six..- A New Approach for Large Eddy Simulation of Turbulence and Scalar Transport.- On the Contribution of Multi-Point Experimental Techniques to the Study of Turbulence.- Direct Numerical Simulations and Hot Wire Experiments: A Possible Way Ahead?.- Small-Scale Structures in Turbulence: Their Implications for Turbulence Closures.- A Note on Local Isotropy in High-Reynolds-Number Turbulence.- Discussion.- Group Work.- Group I: Prospects of physical and numerical experiments for the fundamental understanding of turbulence.- Group II: Future implications of chaos theory, dynamical systems and prospects of low-dimensional descriptions of turbulent flows.- Group III: Reduction of non-linearityin turbulent flows -- further lines of research and their use in the development of the theory of turbulence.- Group IV: Prospects of statistical approaches to the turbulence problem -- how statistical methods, e.g. the theory of random fields, should be used in view of recent developments regarding the structure of turbulence, dynamical chaos, strange attractors, fractals.- Summary of the Symposium.- Discussion.