Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013 PDF
Preview Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013
Fluid Mechanics and Its Applications Vassilis Theofilis Julio Soria Editors Instability and Control of Massively Separated Flows Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4–6 September 2013 Fluid Mechanics and Its Applications Volume 107 Series editor André Thess, Ilmenau, Germany Founding Editor René Moreau, Ecole Nationale Supérieure d’Hydraulique de Grenoble, Saint Martin d’Hères Cedex, France For furthervolumes: http://www.springer.com/series/5980 Aims and Scope of the Series Thepurposeofthisseriesistofocusonsubjectsinwhichfluidmechanicsplaysa fundamental role. Aswellasthemoretraditionalapplicationsofaeronautics,hydraulics,heatand masstransferetc.,bookswillbepublisheddealingwithtopicswhicharecurrently in a state of rapid development, such as turbulence, suspensions and multiphase fluids, super and hypersonic flows and numerical modeling techniques. Itisawidelyheldview thatitisthe interdisciplinary subjectsthatwillreceive intense scientific attention, bringing them to the forefront of technological advancement. Fluidshave the ability to transport matter and itsproperties as well astotransmitforce,thereforefluidmechanicsisasubjectthatisparticularlyopen to cross fertilization with other sciences and disciplines of engineering. The sub- ject of fluid mechanics will be highly relevant in domains such as chemical, metallurgical, biological and ecological engineering. This series is particularly open to such new multidisciplinary domains. The median level of presentation is the first year graduate student. Some texts are monographs defining the current state of a field; others are accessible to final year undergraduates; but essentially the emphasis is on readability and clarity. Vassilis Theofilis Julio Soria • Editors Instability and Control of Massively Separated Flows Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4–6 September 2013 123 Editors VassilisTheofilis Julio Soria School ofAerospace Engineering Department of Mechanical Technical University ofMadrid andAerospace Engineering Madrid Monash University Spain Melbourne,VIC Australia and Department of Aeronautical Engineering KingAbdulaziz University Jeddah UnitedKingdom ofSaudi Arabia ISSN 0926-5112 ISSN 2215-0056 (electronic) ISBN 978-3-319-06259-4 ISBN 978-3-319-06260-0 (eBook) DOI 10.1007/978-3-319-06260-0 Springer ChamHeidelberg New YorkDordrecht London LibraryofCongressControlNumber:2014946397 (cid:2)SpringerInternationalPublishingSwitzerland2015 Thisworkissubjecttocopyright.AllrightsarereservedbythePublisher,whetherthewholeorpartof the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation,broadcasting,reproductiononmicrofilmsorinanyotherphysicalway,andtransmissionor informationstorageandretrieval,electronicadaptation,computersoftware,orbysimilarordissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purposeofbeingenteredandexecutedonacomputersystem,forexclusiveusebythepurchaserofthe work. Duplication of this publication or parts thereof is permitted only under the provisions of theCopyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the CopyrightClearanceCenter.ViolationsareliabletoprosecutionundertherespectiveCopyrightLaw. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publicationdoesnotimply,evenintheabsenceofaspecificstatement,thatsuchnamesareexempt fromtherelevantprotectivelawsandregulationsandthereforefreeforgeneraluse. While the advice and information in this book are believed to be true and accurate at the date of publication,neithertheauthorsnortheeditorsnorthepublishercanacceptanylegalresponsibilityfor anyerrorsoromissionsthatmaybemade.Thepublishermakesnowarranty,expressorimplied,with respecttothematerialcontainedherein. Printedonacid-freepaper SpringerispartofSpringerScience+BusinessMedia(www.springer.com) Preface v vi Preface In 1954 I started my research on separation bubbles. A sharp nosed aerofoil has a steep adverse pressure gradient aft of the nose that causes the boundary layer to separate. At high Reynolds numbers the separated shear layer will become turbulent and reattach forming a short bubble . At lower Reynolds numbers the flow may fail to reattach, or it may form a long bubble . This so-called bursting of the bubble causes a drastic loss of lift and is called a leading edge stall. -Cp Inviscid flow Preface vii High Reynolds number Low Reynolds number viii Preface I was asked to find the cause of this devastating form of stall on swept wings. I considered the problem of zero sweep. The next slide shows contours of the velocities measured with a hot-wire anemometer through a short bubble. The hot-wire signals clearly indicated roughly periodic oscillations in the shear layer. These oscillations increased in amplitude as the wire was moved downstream and eventually the signals became chaotic in the turbulent zone near reattachment. Was the growth of perturbations the key to the problem? Preface ix Velocity contours through the bubble Velocity profiles
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