Instability and Transition: Materials of the workshop held May 15-June 9, 1989 in Hampton, Virgina PDF
Preview Instability and Transition: Materials of the workshop held May 15-June 9, 1989 in Hampton, Virgina
Instability and Transition Volume I ICASE/NASA LaRC Series Stability of Time Dependent and Spatially Varying Flows D.L. Dwoyer and M.Y. Hussaini (eds.) Studies of Vortex Dominated Flows M.Y. Hussaini and M.D. Salas (eds.) Finite Elements: Theory and Application D.L. Dwoyer, M.Y. Hussaini and R.G. Voigt (eds.) Instability and Transition, Volumes I and II M.Y. Hussaini and R.G. Voigt (eds.) M.Y. Hussaini R.G.Voigt Editors Instability and Transition Materials of the workshop held May 15-June 9,1989 in Hampton, Virginia Volume I With 119 illustrations, 2 in color Springer-Verlag New York Berlin Heidelberg London Paris Tokyo Hong Kong M.Y. Hussaini R.G. Voigt Institute for Computer Applications in Science and Engineering (lCASE) !CASE NASA Langley Research Center Hampton, VA 23665 U.S.A. Library of Congress Cataloging·in-Publication Data Instability and transition 1 [edited by I M.Y. Hussaini, Robert Voigt. p. cm. - (!CASE/NASA LaRC series) Proceedings of a workshop on Instability and Transition, held May 15-June 9,1989, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the Langley Research Center (LaRC). 1. Fluid dynamics-Congresses. 2. Transition flow-Congresses. 3. Stability-Congresses. I. Hussaini, M. Yousuff. II. Voigt, Robert G. III. Institute for Computer Applications in Science and Engineering. IV. Langley Research Center. V. Series. TA357.155 1990 532'.0526-dc20 90-9806 ISBN-13: 978-1-4612-8008-8 Printed on acid·free paper. © 1990 Springer-Verlag New York Inc. Softcover reprint of the hardcover 1s t edition 1990 All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer-Verlag New York, Inc., 175 Fifth Avenue, New York, NY 10010, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar meth· odology now known or hereafter developed is forbidden. The use of general descriptive names, trade names, trademarks, etc., in this publication, even if the former are not especially identified, is not to be taken as a sign that such names, as understood by the Trade Marks and Merchandise Marks Act, may accordingly be used freely by anyone. Camera·ready copy provided by the editors using TeX. 9 8 7 6 5 4 3 2 1 ISBN -13: 978-1-4612-8008-8 e-ISBN: 978-1-4612-3430-2 DOl: 10.1007/978-1-4612-3430-2 PREFACE These two volumes contain the proceedings of the workshop on Instability and Transition, sponsored by the Institute for Computer 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. There were tutorials on Applica tions of Transition Research (Bushnell), Challenging Research Top ics in Stability and Transition (Morkovin), Initiation and Evolution of Disturbances in Shear Flows (Morkovin), Flight Transition Re search (Holmes), Theoretical Tools (Hall), Measurement Techniques (Gaster), Modeling of Laminar-Turbulent Transition (Narasimha), Laminar Flow Control in Flight Research (Wagner), 3 Ft. Transonic Pressure Tunnel Laminar Flow Control Research (Bobbitt and Har vey), Computational Tools (Zang), and Effects of Flow Quality on Transition (Bobbitt). There were also numerous demonstrations on experimental techniques. Special sessions were devoted to research presentations on Gortler vortices, crossflow vortices, compressible boundary layer stability. These proceedings contain only panel discussions and the research papers resulting from the collaborative projects started during the workshop and completed shortly thereafter. There were six panels with three to six members in each - the Theory Panel WaS chaired v by Sir James Lighthill, the Low-Speed Experiment Panel by Percy Bobbitt, the High-Speed Experiment Panel by Dennis Bushnell, the Computation Panel by Steven Orszag, the Receptivity Panel by Eli Reshotko, and the Roughness Panel by Mark Morkovin. The par ticipants of the workshop were divided into several focused groups, each hosted by either a Langley or an ICASE scientist: Experiments (Wilkinson, Dagenhart), Receptivity (Gatski), Advanced Asymp totics (Hall), Boundary Layer Stability (Erlebacher), Free Shear Flows (Macaraeg), Compressible Stability and Transition (Malik), Transi tion Simulation (Zang, Streett), and Transition Modeling (Speziale). The first volume contains the panel summaries and the position papers by the panelists as well as the research papers of the Experi ment Group and the Receptivity Group. The second volume contains the research papers from the remaining groups. The success of the workshop was in no small part due to the contributions of the indi~ viduals noted above. We thank all the participants of the workshop for making it such an exciting event. We are deeply grateful to Lee Beach and Roy Harris whose sup port and encouragement was essential from the conception through the execution of the workshop; we are thankful to Richard Barn well and Edwin Prior for their continuous assistance. Then there are many other Langley scientists and logistical staff whose assistance and cooperation contributed to the smooth operation of the work. shop. Our thanks are due to them all, in particular Percy Bobbitt, Dennis Bushnell, Douglas Dwoyer, and Manuel Salas. It is a pleasure to express our sincere appreciation to Linda John son and Emily Todd who handled all the preliminary arrangements for the workshop, to Holly Joplin, who served as the workshop secre tary; and to Etta Blair, who handled reimbursement for the partici pants. We are also appreciative of Emily Todd who coordinated the collection of manuscripts and facilitated their editing, and to Bar bara Stewart who typed the majority of manuscripts. Thanks are also due to Zvi Ruder and other staff of Springer-Verlag for their cooperation in bringing out these volumes. M. Y. Hussaini R. G. Voigt vi WELCOME ADDRESS We at Langley consider the Instability and Transition Workshop extremely important in helping us to assess the state of knowledge in the area of transition from laminar to turbulent flow, to help us -identify promising future areas of research, and to help us build future interactions with the world research community as our panels discuss the status of the major aspects of transition research. As I look to the future, I see our ability to predict and control viscous flow phenomena becoming increasingly important to the suc cessful design of aircraft. Of course, a major feature of these viscous flows is the transition process. Our major aeronautical technology initiatives all require advanced knowledge of transition for their suc cess. Future transport aircraft, both subsonic and supersonic, will require laminar flow control to increase aerodynamic efficiency. The National Aero-Space Plane's design requires an accurate prediction of the hypersonic transition process in order to properly estimate drag, installed engine performance, and aerodynamic heating. Ad vanced military aircraft with high agility require a knowledge of flow separation and control of separation location in order to execute the design. In my view, now is the right time to give increased emphasis to transition research. From my previous discussion, there is clearly a need to move ahead in this arena. At the same time, significant new research tools give us the opportunity to make unprecedented progress over the next several years. These new tools are analytical, computational, and experimental. In the analytical arena, new non linear theoretical techniques give us the ability to understand the fun damental nature of nonlinear interactions in the transitioning flow. Modern computational fluid dynamics techniques give us the ability to directly simulate the transition process, yielding information on details of the flow well into the nonlinear stage previously unattain able. In the experimental area, new facilities and instrumentation allow us to probe transitioning flows under conditions more closely matching the flight environment than previously possible. These fa cilities include not only quiet low-speed facilities, but now a family of quiet supersonic and hypersonic wind tunnels. Additionally, many of the advanced instrumentation techniques developed for wind tunnel use in the recent past are now being successfully applied in flight testing. vii Langley has played a significant role in the development of all of these techniques and facilities. It is our intention to continue to play a leading role in furthering the state of knowledge of transition in the future. This workshop represents a new beginning for us in helping to shape our future research program. Roy V. Harris, Jr. Director for Aeronautics NASA Langley Research Center viii Contents Preface ........................................................ v M. Y. Hussaini and R. G. Voigt Welcome Address ........................................... vii Roy V. Harris Contributors ............................................... xviii Prologue .................................................... xxx M. Y. Hussaini and T. A. Zang Panel Summary: Theory .................................... 3 Sir James Lighthill Position Paper for the Panel on Theory ......................... 6 M. E. Goldstein Some Theoretical Aspects of Boundary Layer Stability Theory ........................................................ 11 Philip Hall Theory ofInstability and Transitj on ............................ 20 Thorwald Herbert Theory on Instability and Transition ........................... 32 Frank T. Smith Panel Summary: High-Speed Transition Experiments ................................................. 43 Dennis Bushnell Suggested Future Directions in High-Speed Transition Experimental Research ......................................... 45 Dennis Bushnell ix High-Speed Quiet Tunnels ..................................... 49 Ivan E. Beckwith Transition in High-Speed Free Shear Layers .................... 52 A. Demetriades Some Comparisons of Linear Stability Theory with Experiment at Supersonic and Hypersonic Speed ............... 68 James M. Kendall Dominance of "Noise" on Boundary Layer Transition in Conventional Wind Tunnels - A Place for the "Quiet" Ballistic Range in Future Studies ...................... 77 Samuel R. Pate Transition Research Using Flight Experiments .................. 88 Eli Reshotko Hypersonic Transition Testing in Wind Tunnels ................ 91 Kenneth F. Stetson Panel Summary: Low Speed Experiments ............... 103 Percy J. Bobbitt Transition Research Opportunities at Subsonic and Transonic Speeds ............................................. 108 Percy J. Bobbitt Some Transition Problems in Three-Dimensional Flows ........ 130 D. Amal Three-Dimensional Mode Resonances in Boundary Layers, Jets and Wakes ....................................... 136 T. C. Corke The Role of the Low-Speed Wind Tunnel in Transition Research ..................................................... 150 M. Gaster x
The list of books you might like
