Instability and Transition: Materials of the workshop held May 15-June 9, 1989 in Hampton, Virgina Volume 1 (ICASE NASA LaRC Series)

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. Front Matter....Pages i-xxxii Front Matter....Pages 1-1 Panel Summary: Theory....Pages 3-5 Position Paper for the Panel on Theory....Pages 6-10 Some Thoeretical Aspects of Boundary Layer Stability Theory....Pages 11-19 Theory of Instability and Transition....Pages 20-31 Theory on Instability and Transition....Pages 32-40 Front Matter....Pages 41-41 Panel Summary: High-Speed Transition Experiments....Pages 43-44 Suggested Future Directions in High-Speed Transition Experimental Research....Pages 45-48 High-Speed Quiet Tunnels....Pages 49-51 Transition in High-Speed Free Shear Layers....Pages 52-67 Some Comparisons of Linear Stability Theory with Experiment at Supersonic and Hypersonic Speed....Pages 68-76 Dominance of “Noise” on Boundary Layer Transition in Conventional Wind Tunnels — a Place for the “Quiet” Ballistic Range in Future Studies....Pages 77-87 Transition Research Using Flight Experiments....Pages 88-90 Hypersonic Transition Testing in Wind Tunnels....Pages 91-100 Front Matter....Pages 101-101 Panel Summary: Low Speed Experiments....Pages 103-107 Transition Research Opportunities at Subsonic and Transonic Speeds....Pages 108-129 Some Transition Problems in Three-Dimensional Flows....Pages 130-135 Three-Dimensional Mode Resonances in Boundary Layers, Jets and Wakes....Pages 136-149 The Role of the Low-Speed Wind Tunnel in Transition Research....Pages 150-152 Transition Delay and Relaminarization of Turbulent Flow....Pages 153-161 Low-Speed Experiments: Requirements for Stability Measurements....Pages 162-174 Front Matter....Pages 175-175 Panel Summary: Computation....Pages 177-183 Numerical Simulation of Transition in Boundary Layers....Pages 184-191 Computation of Instability and Transition....Pages 192-199 Numerical Simulation of Instability and Transition Physics....Pages 200-204 Numerical Computation of Transition to Turbulence....Pages 205-210 Front Matter....Pages 211-211 Panel Summary: Receptivity....Pages 213-214 Receptivity — An Overview....Pages 215-216 Notes on Initial Disturbance Fields for the Transition Problem....Pages 217-232 Position Paper for the Boundary Layer Receptivity Panel....Pages 233-238 Receptivity of Boundary Layers to Acoustic and Vortical Free-Stream Disturbances....Pages 239-249 Receptivity Investigations....Pages 250-262 Front Matter....Pages 263-263 Panel Summary: Roughness....Pages 265-271 On Receptivity to Environmental Disturbances....Pages 272-280 On Roughness — Induced Transition: Facts, Views, and Speculations....Pages 281-295 The Effect of Small-Scale Roughness on the Mean Flow Profile of a Laminar Boundary Layer....Pages 296-302 Front Matter....Pages 303-303 Group Summary: Experiments....Pages 305-305 Flow Visualization of a Wave Packet on a Rotating Disk....Pages 306-318 Transition Control....Pages 319-354 Perturbation Amplification in the Entry Region of a Transitional Pipe Flow....Pages 355-371 Experimental Observations on the Relationship Between Stagnation Region Flow Oscillations and Eddy Shedding for Circular Cylinder....Pages 372-386 Front Matter....Pages 303-303 Experiments on a Separation Bubble Over an Eppler 387 Airfoil at Low Reynolds Numbers using Thin-Film Arrays....Pages 387-407 Front Matter....Pages 409-409 Group Summary: Receptivity....Pages 411-413 Boundary Layer Receptivity Due to Three-Dimensional Convected Gusts....Pages 414-425 Boundary Layer Receptivity to Unsteady Free-Stream Pressure Gradients....Pages 426-439