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

Preface. Current and Future Needs in Turbulence Modeling; J.N. Hefner. Army Turbulence Modeling Needs; T.L. Doligalski. The Best Turbulence Models for Engineers; P. Bradshaw. The Modeling of Turbulent Flows with Significant Curvature or Rotation; B.E. Launder. A Perspective on Turbulence Modeling; S.B. Pope. Developments in Structure-based Turbulence Modeling; S.C. Kassinos, W.C. Reynolds. The Low Dimensional Approach to Turbulence; J.L. Lumley, P. Blossey. Modeling Non-equilibrium Turbulent Flows; C.G. Speziale. Development of Algebraic Reynold Stress Model for Non-equilibrium Turbulence; S.S. Girimaji. Toward a Vortex Method Simulation of Non-equilibrium Turbulent Flows; P.S. Bernard. Two-point Closures and Statistical Equilibrium; T.T. Clark. Modeling the Turbulent Wall Flows Subjected to Strong Pressure Variations; K. Hanjalic, et al. Some Structural Features of Pressure-driven Three-dimensional Turbulent Boundary Layers from Experiments; R.L. Simpson, et al. Physics and Computations of Flows with Adverse Pressure Gradients; P.G. Huang. Computations of Complex Turbulent Flows Using the Commercial Code FLUENT; S.-E. Kim, et al. Simulation of Shock Wave-turbulent Boundary Layer Interactions Using the Renolds-averaged Navier-Stokes Equations; D.D. Knight. Some Results Relevant to Statistical Closures for Compressible Turbulence; J.R. Ristorcelli. Transport Coefficients in Rotating Weakly Compressible Turbulence; R. Rubinstein, et al. Development of a Turbulence Model for Flows with Rotation and Curvature; S. Thangam, et al. Modeling and Analysis of Turbulent Flows in the Presence of Rotation and Curvature; X. Wang, et al. List of Attendees.