Instability and Transition: Materials of the Workshop Held May 15-June 9, 1989 in Hampton, Virgina Volume 1

ISBN-13: 9781461280088 / Angielski / Miękka / 2011 / 439 str.

M. y. Hussaini; Ed. Robert G. Voigt

Opis

These two volumes contain the proceedings of the workshop on the Institute for Computer Instability and Transition, sponsored by Applications in Science and Engineering (ICASE) and the Langley Research Center (LaRC), during May 15 to June 9, 1989. The work shop coincided with the initiation of a new, focused research pro gram on instability and transition at LaRC. The objectives of the workshop were to (i) expose the academic community to current technologically important issues of instability and transition in shear flows over the entire speed range, (ii) acquaint the academic com munity with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these facilities, (iii) review current state-of-the-art and propose fu ture directions for instability and transition research, (iv) accelerate progress in elucidating basic understanding of transition phenomena and in transferring this knowledge into improved design methodolo gies through improved transition modeling, and (v) establish mech anisms for continued interaction. The objectives (i) to (iii) were of course immediately met. It is still premature to assess whether ob jectives (iv) and (v) are achieved. The workshop program consisted of tutorials, research presenta tions, panel discussions, experimental and computational demonstra tions, and collaborative projects."

Spis treści

Panel Summary: Theory.- Position Paper for the Panel on Theory.- Some Theoretical Aspects of Boundary Layer Stability Theory.- Theory of Instability and Transition.- Theory on Instability and Transition.- Panel Summary: High-Speed Transition Experiments.- Suggested Future Directions in High-Speed Transition Experimental Research.- High-Speed Quiet Tunnels.- Transition in High-Speed Free Shear Layers.- Some Comparisons of Linear Stability Theory with Experiment at Supersonic and Hypersonic Speed.- Dominance of “Noise” on Boundary Layer Transition in Conventional Wind Tunnels — A Place for the “Quiet” Ballistic Range in Future Studies.- Transition Research Using Flight Experiments.- Hypersonic Transition Testing in Wind Tunnels.- Panel Summary: Low Speed Experiments.- Transition Research Opportunities at Subsonic and Transonic Speeds.- Some Transition Problems in Three-Dimensional Flows.- Three-Dimensional Mode Resonances in Boundary Layers, Jets and Wakes.- The Role of the Low-Speed Wind Tunnel in Transition Research.- Transition Delay and Relaminarization of Turbulent Flow.- Low-Speed Experiments: Requirements for Stability Measurements.- Panel Summary: Computation.- Numerical Simulation of Transition in Boundary Layers.- Computation of Instability and Transition.- Numerical Simulation of Instability and Transition Physics.- Numerical Computation of Transition to Turbulence.- Panel Summary: Receptivity.- Receptivity — An Overview.- Notes on Initial Disturbance Fields for the Transition Problem.- Position Paper for the Boundary Layer Receptivity Panel.- Receptivity of Boundary Layers to Acoustic and Vortical Free-Stream Disturbances.- Receptivity Investigations.- Panel Summary: Roughness.- On Receptivity to Environmental Disturbances.- On Roughness-Induced Transition: Facts, Views, and Speculations.- The Effect of Small-Scale Roughness on the Mean Flow Profile of a Laminar Boundary Layer.- Group Summary: Experiments.- Flow Visualization of a Wave Packet on a Rotating Disk.- Transition Control.- Perturbation Amplification in the Entry Region of a Transitional Pipe Flow.- Experimental Observations on the Relationship Between Stagnation Region Flow Oscillations and Eddy Shedding for Circular Cylinder.- Experiments on a Separation Bubble over an Eppler 387 Airfoil at Low Reynolds Numbers Using Thin-Film Arrays.- Group Summary: Receptivity.- Boundary Layer Receptivity Due to Three-Dimensional Convected Gusts.- Boundary Layer Receptivity to Unsteady Free-Stream Pressure Gradients.