This volume contains the proceedings of the Workshop on In­ stability, Transition and Turbulence, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the NASA Langley Research Center (LaRC), during July 8 to August 2, 1991. This is the second workshop in the series on the subject. The first was held in 1989, and its proceedings were published by Springer-Verlag under the title "Instability and Transition" edited by M. Y. Hussaini and R. G. Voigt. The objectives of these work­ shops are to i) expose the academic community to current technologically im­ portant issues of transition and turbulence in shear flows over the entire speed range, ii) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these capabilities, and iii) accelerate progress in elucidating the fundamental phenomena of transition and turbulence, leading to improved transition and turbulence modeling in design methodologies. The research areas covered in these proceedings include receptiv­ ity and roughness, nonlinear theories of transition, numerical simu­ lation of spatially evolving flows, modelling of transitional and fully turbulent flows as well as some experiments on instability and tran­ sition. In addition a one-day mini-symposium was held to discuss 1 recent and planned experiments on turbulent flow over a backward­ facing step.

Inhalt

Group Summary: Experiments.- Controlled Experiments on Resonant Cross-Flow Mode Interactions.- High Speed Boundary Layer Transition on a Blunt Nose Flare with Roughness.- Summary: Mini-Symposium on Turbulent Flow Over a Backward-Facing Step.- Group Summary: Advanced Asymptotics I.- The Inviscid Instability of a Nonlinear Görtler Vortex State in a Large Mach Number Boundary Layer Flow.- On the Interaction of Görtler Vortices and Tollmien-Schlichting Waves in Boundary Layer Flows.- On the Nonlinear Evolution of Large Wavelength Görtler Vortices.- Vortex-Wave Interaction in a Strong Adverse Pressure Gradient.- Group Summary: Advanced Asymptotics II.- Ellipticity in the Vortex Breakdown Problem.- Inviscid Stability of Hypersonic Strong Interaction Flow Over a Flat Plate.- Nonseparable Eigenmodes of the Incompressible Boundary Layer.- Spatially-Quasiperiodic States in Shear Flows.- Group Summary: Advanced Stability.- Effect of Suction on the Stability of Flow on a Rotating Disk.- Nonparallel Stability of Rotating Disk Flow Using PSE.- Local and Non-Local Stability Theory of Spatially Varying Flows.- Temperature Effects on the Instability of an Infinite Swept Attachment Line.- Stability of Velocity Profiles with Reverse Flow.- Boundary-Layer Transition: Critical-Layer Nonlinearity in Fully Interactive Resonant Triad.- Oblique Mode Breakdown in a Supersonic Boundary Layer Using Nonlinear PSE.- Discrete Modes and Continuous Spectra in a Mach 2 Boundary Layer.- On the Stability of Normal Shock Waves.- Group Summary: Simulation I.- Effects of Inflow Disturbances on Spatially-Evolving Instability in Plane Channel Flow.- A Spectral Multi-Domain Code for the Navier-Stokes Equations.- A Preliminary Study of Crossflow Transition on a Swept Wing by Spatial Direct Numerical Simulation.- Oblique-Wave Breakdown in an Incompressible Boundary Layer Computed by Spatial DNS and PSE Theory.- Simulation of Nonlinear Tollmien-Schlichting Wave Growth Through a Laminar Separation Bubble.- Group Summary: Simulation II.- Reynolds Stress Budget in a Transitional Channel Flow.- Outgoing Acoustic Waves in an Unstable Supersonic Laminar Boundary Layer Over a Flexible Surface.- On the Non-Uniqueness of the Parallel-Flow Approximation.- Channel Flow Transition Induced by a Pair of Oblique Waves.- The Formation and Growth of a Hairpin Vortex.- Aspects of Laminar Breakdown in Boundary-Layer Transition.- Group Summary: Simulation III.- Instability of Wall-Bounded Compressible Reacting Mixing Layers.- Stability of High Speed Compressible Rotating Couette Flow.- Group Summary: Receptivity.- Effect of Leading-Edge Geometry on Boundary-Layer Receptivity to Freestream Sound.- Effect of Nose Bluntness on Leading-Edge Receptivity.- Leading-Edge Receptivity to a Vortical Freestream Disturbance: A Numerical Analysis.- Nonlocalized Receptivity to Vortical Free-Stream Disturbances.- Group Summary: Turbulence Theory.- Assessment of Two-Equation Turbulence Models for Predicting Transitional Flows.- Proper Orthogonal Decomposition Based Turbulence Modeling.- Detonation-Turbulence Interactions.- Spectral Laws for the Compressible Isotropic Turbulence.- Nonlinear Wave Interactions in Compressible Turbulence.- A Comparison of Turbulence Models for Homogeneous Shear Flows with Longitudinal Curvature.- Group Summary: Turbulence Modeling.- The Role of Vortex Stretching in Turbulence Modeling.- Application of Second Moment Closure Models to Complex Flows: Part I - Wall Bounded Flows.- Large-Eddy Simulation of Supersonic, Wall-Bounded, Turbulent Flows.- Turbulent Flow Past the Backward-Facing Step: Modeling and Computations.- A k ? ? Calculation of Transitional Boundary Layers.