Turbulence modeling both addresses a fundamental problem in physics, 'the last great unsolved problem of classical physics,' and has far-reaching importance in the solution of difficult practical problems from aeronautical engineering to dynamic meteorology. However, the growth of supercom puter facilities has recently caused an apparent shift in the focus of tur bulence research from modeling to direct numerical simulation (DNS) and large eddy simulation (LES). This shift in emphasis comes at a time when claims are being made in the world around us that scientific analysis itself will shortly be transformed or replaced by a more powerful 'paradigm' based on massive computations and sophisticated visualization. Although this viewpoint has not lacked ar ticulate and influential advocates, these claims can at best only be judged premature. After all, as one computational researcher lamented, 'the com puter only does what I tell it to do, and not what I want it to do. ' In turbulence research, the initial speculation that computational meth ods would replace not only model-based computations but even experimen tal measurements, have not come close to fulfillment. It is becoming clear that computational methods and model development are equal partners in turbulence research: DNS and LES remain valuable tools for suggesting and validating models, while turbulence models continue to be the preferred tool for practical computations. We believed that a symposium which would reaffirm the practical and scientific importance of turbulence modeling was both necessary and timely.

Inhalt
Current and Future Needs in Turbulence Modeling.- Army Turbulence Modeling Needs.- The Best Turbulence Models for Engineers.- The Modeling of Turbulent Flows with Significant Curvature or Rotation.- A Perspective on Turbulence Modeling.- Developments in Structure-based Turbulence Modeling.- The Low Dimensional Approach to Turbulence.- Modeling Non-equilibrium Turbulent Flows.- Development of Algebraic Reynolds Stress Model for Non-equilibrium Turbulence.- Toward a Vortex Method Simulation of Non-equilibrium Turbulent Flows.- Two-point Closures and Statistical Equilibrium.- Modeling the Turbulent Wall Flows Subjected to Strong Pressure Variations.- Some Structural Features of Pressure-driven Three-dimensional Turbulent Boundary Layers from Experiments.- Physics and Computations of Flows with Adverse Pressure Gradients.- Computations of Complex Turbulent Flows Using the Commercial Code FLUENT.- Simulation of Shock Wave-turbulent Boundary Layer Interactions Using the Reynolds-averaged Navier-Stokes Equations.- Some Results Relevant to Statistical Closures for Compressible Turbulence.- Transport Coefficients in Rotating Weakly Compressible Turbulence.- Development of a Turbulence Model for Flows with Rotation and Curvature.- Modeling and Analysis of Turbulent Flows in the Presence of Rotation and Curvature.- List of Attendees.