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Compressibility Effects On The Non Linear Receptivity Of Boundary Layers To Dielectric Barrier Discharges
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Book Synopsis Compressibility Effects on the Non-linear Receptivity of Boundary Layers to Dielectric Barrier Discharges by : Marie F.C. Denison
Download or read book Compressibility Effects on the Non-linear Receptivity of Boundary Layers to Dielectric Barrier Discharges written by Marie F.C. Denison and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The reduction of drag and aerodynamic heating caused by boundary layer transition is of central interest for the development of hypersonic vehicles. Receptivity to flow perturbation in the form of Tollmien-Schlichting (TS) wave growth often determines the first stage of the transition process, which can be delayed by depositing specific excitations into the boundary layer. Weakly ionized Dielectric Barrier Discharge (DBD) actuators are being investigated as possible sources of such excitations, but little is known today about their interaction with high-speed flows. In this framework, the first part of the thesis is dedicated to a receptivity study of laminar compressible boundary layers over a flat plate by linear stability analysis following an adjoint operator formulation, under DBD representative excitations assumed independent of flow conditions. The second part of the work concentrates on the development of a coupled plasma-Navier and Stokes solver targeted at the study of supersonic flow and compressibility effects on DBD forcing and non-parallel receptivity.The linear receptivity study of quasi-parallel compressible flows reveals several interesting features such as a significant shift of the region of maximum receptivity deeper into the flow at high Mach number and strong wave amplitude reduction compared to incompressible flows. The response to DBD relevant excitation distributions and to variations of the base flow conditions and system length scales follows these trends. Observed absolute amplitude changes and relative sensitivity modifications between source types are related to the evolution of the offset between forcing peak profile and relevant adjoint mode maximum. The analysis highlights the crucial importance of designing and placing the actuator in a way that matches its force field to the position of maximum boundary layer receptivity for the specific flow conditions of interest. In order to address the broad time and length scale spectrum inherent to the compressible flow-plasma problem, a solver has been developed using a novel Adaptive Mesh Refinement (AMR) algorithm based on the Chombo design for the solution of partial differential equations. Its embedded boundary formalism is utilized to solve the electrostatic potential in the complete domain including the DBD dielectric layer. The program allows accounting for non-equilibrium electron energization and resulting effect on transport and chemical reactions, with air or helium chemistry parametrization. Preliminary direct discharge test cases are reported for the latter.
Book Synopsis Convection with Local Thermal Non-Equilibrium and Microfluidic Effects by : Brian Straughan
Download or read book Convection with Local Thermal Non-Equilibrium and Microfluidic Effects written by Brian Straughan and published by Springer. This book was released on 2015-07-08 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is one of the first devoted to an account of theories of thermal convection which involve local thermal non-equilibrium effects, including a concentration on microfluidic effects. The text introduces convection with local thermal non-equilibrium effects in extraordinary detail, making it easy for readers newer to the subject area to understand. This book is unique in the fact that it addresses a large number of convection theories and provides many new results which are not available elsewhere. This book will be useful to researchers from engineering, fluid mechanics, and applied mathematics, particularly those interested in microfluidics and porous media.
Book Synopsis Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer by : Meelan Choudhari
Download or read book Effect of Nonzero Surface Admittance on Receptivity and Stability of Compressible Boundary Layer written by Meelan Choudhari and published by . This book was released on 1994 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of the Receptivity of a Compressible Laminar Boundary Layer and the Effects on Stability and Receptivity of 2-D and 3-D Pressure Gradients by :
Download or read book An Experimental Study of the Receptivity of a Compressible Laminar Boundary Layer and the Effects on Stability and Receptivity of 2-D and 3-D Pressure Gradients written by and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques have been developed to provide, for the first time, pure tone acoustic forcing with a wave packet having a particular wave vector and at instability wave frequencies for a supersonic boundary layer. Receptivity to this pure tone forcing has been studied, initially with continuous forcing and now with well defined wave packets. In the latter case precise measurements can now be made of the detailed response to the free-stream disturbance. The wave velocity and wave vector in the free-stream have been determined consistently. A preliminary finding from the wave packet experiments is that the boundary layer response is broadly in two parts; one which is a local forced response in phase with the free-stream forcing and the other which, at downstream locations, has larger amplitude, is growing with downstream distance and has a significant time delay compared with the first forced response. The explanation for this second wave packet and its relation to the first is not yet clear and is the present subject of detailed investigation. Once the data and an understanding are obtained with the present U + a wave forcing attention will be focused on U - a waves. It was found in 1, that the stream-wise wavelengths of the instability waves and the acoustic U - a free-stream fluctuations were closely matched and it was speculated that this played an important role in receptivity.
Book Synopsis Compressible Boundary Layer Receptivity and Instability by :
Download or read book Compressible Boundary Layer Receptivity and Instability written by and published by . This book was released on 1998 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high quality flow has been established in a low turbulence variable geometry (LTVG) 8' x 8' supersonic wind-tunnel at Princeton. In particular, the facility is being operated at very low stagnation pressures ( - = 4 psia) giving a large region of laminar flow on a flat plate with laminar boundary layers up to approximately 3mm thick. Mean profiles, amplitude distributions, two wire correlations and spectra have been measured in detail through a Mach 3 boundary layer along the centerline of the flat plate. The initial results are for "naturally" occurring instability and transition and they are being followed by measurements of the forced response from a point source (spark) .1.
Book Synopsis Stability and Transition in Shear Flows by : Peter J. Schmid
Download or read book Stability and Transition in Shear Flows written by Peter J. Schmid and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed look at some of the more modern issues of hydrodynamic stability, including transient growth, eigenvalue spectra, secondary instability. It presents analytical results and numerical simulations, linear and selected nonlinear stability methods. By including classical results as well as recent developments in the field of hydrodynamic stability and transition, the book can be used as a textbook for an introductory, graduate-level course in stability theory or for a special-topics fluids course. It is equally of value as a reference for researchers in the field of hydrodynamic stability theory or with an interest in recent developments in fluid dynamics. Stability theory has seen a rapid development over the past decade, this book includes such new developments as direct numerical simulations of transition to turbulence and linear analysis based on the initial-value problem.
Book Synopsis Stability and Transition by : Tuncer Cebeci
Download or read book Stability and Transition written by Tuncer Cebeci and published by Springer. This book was released on 2004 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROMs include computer programs referred to in chapters 4-8 and Appendix B
Book Synopsis Instability and Transition by : M.Y. Hussaini
Download or read book Instability and Transition written by M.Y. Hussaini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to predict and control viscous flow phenomena is becoming increasingly important in modern industrial application. The Instability and Transition Workshop at Langley was extremely important in help§ ing the scientists community to access the state of knowledge in the area of transition from laminar to turbulent flow, to identify promising future areas of research and to build future interactions between researchers worldwide working in the areas of theoretical, experimental and computational fluid and aero dynamics. The set of two volume contains panel discussions and research contribution with the following objectives: (1) expose the academic community to current technologically important issues of instability and transitions in shear flows over the entire speed range, (2) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these facilities. (3) review current state-of-the-art and propose future directions for instability and transition research, (4) accelerate progress in elucidating basic understanding of transition phenomena and in transferring this knowledge into improved design methodologies through improved transition modeling, and (5) establish mechanism for continued interaction.
Book Synopsis Shock Wave-Boundary-Layer Interactions by : Holger Babinsky
Download or read book Shock Wave-Boundary-Layer Interactions written by Holger Babinsky and published by Cambridge University Press. This book was released on 2011-09-12 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
Book Synopsis Transition Location Effect on Shock Wave Boundary Layer Interaction by : Piotr Doerffer
Download or read book Transition Location Effect on Shock Wave Boundary Layer Interaction written by Piotr Doerffer and published by Springer Nature. This book was released on 2020-07-30 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents experimental and numerical findings on reducing shock-induced separation by applying transition upstream the shock wave. The purpose is to find out how close to the shock wave the transition should be located in order to obtain favorable turbulent boundary layer interaction. The book shares findings obtained using advanced flow measurement methods and concerning e.g. the transition location, boundary layer characteristics, and the detection of shock wave configurations. It includes a number of experimental case studies and CFD simulations that offer valuable insights into the flow structure. It covers RANS/URANS methods for the experimental test section design, as well as more advanced techniques, such as LES, hybrid methods and DNS for studying the transition and shock wave interaction in detail. The experimental and numerical investigations presented here were conducted by sixteen different partners in the context of the TFAST Project. The general focus is on determining if and how it is possible to improve flow performance in comparison to laminar interaction. The book mainly addresses academics and professionals whose work involves the aerodynamics of internal and external flows, as well as experimentalists working with compressible flows. It will also be of benefit for CFD developers and users, and for students of aviation and propulsion systems alike.
Book Synopsis New Results in Numerical and Experimental Fluid Mechanics X by : Andreas Dillmann
Download or read book New Results in Numerical and Experimental Fluid Mechanics X written by Andreas Dillmann and published by Springer. This book was released on 2016-03-28 with total page 855 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents contributions to the 19th biannual symposium of the German Aerospace Aerodynamics Association (STAB) and the German Society for Aeronautics and Astronautics (DGLR). The individual chapters reflect ongoing research conducted by the STAB members in the field of numerical and experimental fluid mechanics and aerodynamics, mainly for (but not limited to) aerospace applications, and cover both nationally and EC-funded projects. Special emphasis is given to collaborative research projects conducted by German scientists and engineers from universities, research-establishments and industries. By addressing a number of cutting-edge applications, together with the relevant physical and mathematics fundamentals, the book provides readers with a comprehensive overview of the current research work in the field. Though the book’s primary emphasis is on the aerospace context, it also addresses further important applications, e.g. in ground transportation and energy.
Book Synopsis Encyclopedic Dictionary of Polymers by : Jan W. Gooch
Download or read book Encyclopedic Dictionary of Polymers written by Jan W. Gooch and published by Springer Science & Business Media. This book was released on 2010-11-08 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference, in its second edition, contains more than 7,500 polymeric material terms, including the names of chemicals, processes, formulae, and analytical methods that are used frequently in the polymer and engineering fields. In view of the evolving partnership between physical and life sciences, this title includes an appendix of biochemical and microbiological terms (thus offering previously unpublished material, distinct from all competitors.) Each succinct entry offers a broadly accessible definition as well as cross-references to related terms. Where appropriate to enhance clarity further, the volume's definitions may also offer equations, chemical structures, and other figures. The new interactive software facilitates easy access to a large database of chemical structures (2D/3D-view), audio files for pronunciation, polymer science equations and many more.
Book Synopsis The Science of Clays by : Swapna Mukherjee
Download or read book The Science of Clays written by Swapna Mukherjee and published by Springer Science & Business Media. This book was released on 2013-10-09 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an attempt to provide a comprehensive and coherent description of three widely separated aspects of clays: the science of clays; the industrial uses of clays; and the role of clays in the environment. Most of the existing literature lacks such an integrated study and this work endeavours to fill that gap. An exhaustive account of the science of clays is presented in Part I of the book, which includes the classification, origin and evolution, composition and internal structure, chemical and physical properties of clays; soil mechanics; and analytical techniques for determining clay constituents. Part II provides a comprehensive description of the applications of clays and their derivatives in various industries, while Part III describes the role of clays in the environment; the pollution caused by clay minerals; and the application of clays in order to prevent environmental hazards. A principal feature of the book is its explanation of how the structure and composition of particular clay types facilitate their specific industrial or environmental applications, thus describing the interrelationship between three widely varying aspects of clay. A number of thought-provoking questions are raised at the end of the work in order to leave readers with a better insight in this regard.
Book Synopsis Chemistry and Technology of Water Based Inks by : P. Laden
Download or read book Chemistry and Technology of Water Based Inks written by P. Laden and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has been a long time in the making. Since its beginning the concept has been refined many times. This is a first attempt at a technical book for me and fortunately the goals I have set have been achieved. I have been involved in water based ink evaluation since its unclear begin nings in the early 1970s. This book is fashioned much like a loose-leaf binder I had put together for early reference and guidance. The format has worked for me over the years; I trust it will work for you. I would like to thank the many people who made this book possible, particularly Blackie Academic & Professional for their saint-like patience. Thanks again to W.B. Thiele (Thiele-Engdahl), to Lucille, my wife, and to James and Frank, my two boys. A final and special thank you to Richard Bach who taught me there are no limits.
Book Synopsis Machining of Polymer Composites by : Jamal Ahmad
Download or read book Machining of Polymer Composites written by Jamal Ahmad and published by Springer Science & Business Media. This book was released on 2009-04-21 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This excellent volume will serve as an indispensable reference and source book for process design, tool and production engineers in composite manufacturing. It provides the reader with a comprehensive treatment of the theory of machining as it applies to fiber reinforced polymer composites. It covers the latest technical advances in the area of machining and tooling, and discusses the applications of fiber reinforced polymer composites in the aircraft and automotive industries.
Book Synopsis Heat Conduction Using Green's Functions by : Kevin Cole
Download or read book Heat Conduction Using Green's Functions written by Kevin Cole and published by Taylor & Francis. This book was released on 2010-07-16 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its publication more than 15 years ago, Heat Conduction Using Green's Functions has become the consummate heat conduction treatise from the perspective of Green's functions-and the newly revised Second Edition is poised to take its place. Based on the authors' own research and classroom experience with the material, this book organizes the so
Book Synopsis Ecological Wisdom Inspired Restoration Engineering by : Varenyam Achal
Download or read book Ecological Wisdom Inspired Restoration Engineering written by Varenyam Achal and published by Springer. This book was released on 2018-08-24 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on ecological wisdom inspired restoration engineering through theories, hypotheses, policies, practical understanding, and case studies. Understanding nature’s processes is a prerequisite for the healthy and sustainable functioning of a habitable Earth. As such, the book provides a guide for readers seeking to understand and build sustainable, urban socio-ecological systems using restoration technologies based on wisdom. Motivated by recent rapid advances in restoration engineering, such as the role of green building materials in urban infrastructures, and developing sustainable landscapes to benefit the environment, economy and communities, it is an essential reference on the most promising innovative technologies. It discusses engineering methods and practices in the restoration of soil, water, heritage sites, and other ecosystems, as well as the development and applications of green building materials. It presents a holistic and systematic approach that utilizes natural resources and the concept of ecological wisdom to reap sustainable environmental, economic and social benefits to fulfill the concept of living in harmony with nature. This book is a valuable resource for civil- and environmental engineering researchers as well as organizations engaged in eco-restoration practices.
