Instability and Transition in Unsteady Rotating Flows - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Instability and Transition in Unsteady Rotating Flows write by Sophie Alexandra Walter Calabretto. This book was released on 2015. Instability and Transition in Unsteady Rotating Flows available in PDF, EPUB and Kindle. The unsteady flow of rotating fluids can exhibit some fascinating and elegant phenomena. The movement of fluid due to the rotation of an encompassing container, or the flow of fluid due to the rotation of a solid object immersed within a body of fluid, is of particular interest. Specifically, we focus on the dynamics resulting from an impulsive change in the rotation rate for both these internal and external flows, including the formation of boundary layers and their subsequent evolution, and the formation of instabilities. Using a combination of analytical, computational and experimental methods, we consider the flow induced by both a torus and a sphere, contained in an otherwise quiescent body of fluid, suddenly imparted with angular momentum. Our results agree well with previous work on this classical problem, known to exhibit a boundary-layer collision process, and we are able to take this problem further to consider the post-collision dynamics, encountering some new and exciting results, such as the development and propagation of a toroidal vortex pair, as a result of the boundary-layer collision, and instability of the radial jet. We also consider the flow within fluid-filled annular and toroidal containers, when there is a sudden change in the rotation rate of the container. Using both analytical and computational approaches, we explore the initial development of the impulsively generated axisymmetric boundary layer, its subsequent instability, and the larger scale transient features within this class of flows. This allows us to compare with and, perhaps, proffer an explanation for previously unexplained experimental results for the flow within a fluid-filled torus. In particular, we demonstrate that small imperfections in the torus surface, introduced during manufacture, can generate substantial secondary motion, considerably different from that which would arise if caused by centrifugal instabilities. This serves to highlight the often overlooked impact of small disturbances on the global dynamics of such flows.
Instability, Transition, and Turbulence
Instability, Transition, and Turbulence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Instability, Transition, and Turbulence write by M.Y. Hussaini. This book was released on 2012-12-06. Instability, Transition, and Turbulence available in PDF, EPUB and Kindle. This volume contains the proceedings of the Workshop on In stability, Transition and Turbulence, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the NASA Langley Research Center (LaRC), during July 8 to August 2, 1991. This is the second workshop in the series on the subject. The first was held in 1989, and its proceedings were published by Springer-Verlag under the title "Instability and Transition" edited by M. Y. Hussaini and R. G. Voigt. The objectives of these work shops are to i) expose the academic community to current technologically im portant issues of transition and turbulence in shear flows over the entire speed range, ii) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these capabilities, and iii) accelerate progress in elucidating the fundamental phenomena of transition and turbulence, leading to improved transition and turbulence modeling in design methodologies. The research areas covered in these proceedings include receptiv ity and roughness, nonlinear theories of transition, numerical simu lation of spatially evolving flows, modelling of transitional and fully turbulent flows as well as some experiments on instability and tran sition. In addition a one-day mini-symposium was held to discuss 1 recent and planned experiments on turbulent flow over a backward facing step.
Instabilities of Flows and Transition to Turbulence
Instabilities of Flows and Transition to Turbulence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Instabilities of Flows and Transition to Turbulence write by Tapan K. Sengupta. This book was released on 2012-04-24. Instabilities of Flows and Transition to Turbulence available in PDF, EPUB and Kindle. Addressing classical material as well as new perspectives, Instabilities of Flows and Transition to Turbulence presents a concise, up-to-date treatment of theory and applications of viscous flow instability. It covers materials from classical instability to contemporary research areas including bluff body flow instability, mixed convection flows, and application areas of aerospace and other branches of engineering. Transforms and perturbation techniques are used to link linear instability with receptivity of flows, as developed by the author. The book: Provides complete coverage of transition concepts, including receptivity and flow instability Introduces linear receptivity using bi-lateral Fourier-Laplace transform techniques Presents natural laminar flow (NLF) airfoil analysis and design as a practical application of classical and bypass transition Distinguishes strictly between instability and receptivity, which leads to identification of wall- and free stream-modes Describes energy-based receptivity theory for the description of bypass transitions Instabilities of Flows and Transition to Turbulence has evolved into an account of the personal research interests of the author over the years. A conscious effort has been made to keep the treatment at an elementary level requiring rudimentary knowledge of calculus, the Fourier-Laplace transform, and complex analysis. The book is equally amenable to undergraduate students, as well as researchers in the field.
Stability and Transition in Shear Flows
Stability and Transition in Shear Flows - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Stability and Transition in Shear Flows write by Peter J. Schmid. This book was released on 2012-12-06. Stability and Transition in Shear Flows available in PDF, EPUB and Kindle. 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.
Transition and Turbulence
Transition and Turbulence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Transition and Turbulence write by Richard E. Meyer. This book was released on 2014-05-10. Transition and Turbulence available in PDF, EPUB and Kindle. Mathematics Research Center Symposia and Advanced Seminar Series: Transition and Turbulence covers the lectures presented at the Symposium on Transition and Turbulence in Fluids, held in Madison, Wisconsin on October 13-15, 1980 under the auspices of the Mathematics Research Center of the University of Wisconsin-Madison. The book focuses on the relation between transition and turbulence in fluids and the importance of this relation for the understanding of many real fluid motions. The selection first elaborates on transition in flow between rotating concentric cylinders, observations in the Taylor experiment, and transition to turbulence in thermal convection with and without rotation. Discussions focus on low aspect ratio convection layers, random convection in a rotating layer, unsteady flows at high Reynolds numbers, transition to oscillatory motion, and experimental observations. The text then tackles instability and turbulence in jets, instability and transition in pipes and channels, and transition to turbulence in boundary layers. The book ponders on coherent structures in turbulence; interactions between large-scale coherent structures and fine-grained turbulence in free shear flows; and vortex interactions and coherent structures in turbulence. Topics include atomic and molecular representations, vortices in uniform strain, vortex pairs, numerical computations applied to a simple problem, agglomeration of large-scale structures and subharmonic formation, retrieving phase information, and dynamical equations. The selection is highly recommended for researchers interested in pursuing further studies on transition and turbulence.
