Linear And Nonlinear Instabilities Of Blasius Boundary Layer Perturbed By Streamwise Vortices
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Linear And Nonlinear Instabilities Of Blasius Boundary Layer Perturbed By Streamwise Vortices
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Author : Xue-Song Wu
language : en
Publisher:
Release Date : 2001
Linear And Nonlinear Instabilities Of Blasius Boundary Layer Perturbed By Streamwise Vortices written by Xue-Song Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Linear And Nonlinear Instabilities Of Blasius Boundary Layer Perturbed By Streamwise Vortices Part Ii Intermittent Instability Induced By Long Wavelength Klebanoff Modes
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Author :
language : en
Publisher:
Release Date : 2001
Linear And Nonlinear Instabilities Of Blasius Boundary Layer Perturbed By Streamwise Vortices Part Ii Intermittent Instability Induced By Long Wavelength Klebanoff Modes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
This report presents theoretical results on the stability properties of a Blasius boundary layer perturbed by Klebanoff distortions with a relatively long spanwise scale. Even relatively weak Klebanoff modes can alter the near-wall curvature of the underlying flow by O(1) and, hence, introduce linear instabilities with larger characteristic growth rates and frequencies than those of the Tollmien-Schlichting waves in an unperturbed Blasius flow. A localised distortion supports both sinuous and varicose modes of instability, with the growth rates of the sinuous modes being likely to be larger, in general. Overall, the instability is intermittent in time and localised in space, being confined to a finite part of the Klebanoff mode cycle and to a specific window(s) along the streamwise direction. A spanwise periodic distortion supports spatially quasi-periodic modes (via the parametric resonance mechanism), which may be viewed as modified T-S waves with excess growth rates when the Klebanoff modes are weak. In spite of the simplifications involved in this theory, its predictions appear qualitatively consistent with some of the unusual characteristics of the high-frequency wavepackets observed during previous experiments. The nonlinear development of a localised sinuous mode is followed across a sequence of asymptotic regimes using the non-equilibrium critical-layer theory.
Seventh Iutam Symposium On Laminar Turbulent Transition
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Author : Philipp Schlatter
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-03-11
Seventh Iutam Symposium On Laminar Turbulent Transition written by Philipp Schlatter and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-03-11 with Science categories.
The origins of turbulent ?ow and the transition from laminar to turbulent ?ow are the most important unsolved problems of ?uid mechanics and aerodynamics. - sides being a fundamental question of ?uid mechanics, there are numerous app- cations relying on information regarding transition location and the details of the subsequent turbulent ?ow. For example, the control of transition to turbulence is - pecially important in (1) skin-friction reduction of energy ef?cient aircraft, (2) the performance of heat exchangers and diffusers, (3) propulsion requirements for - personic aircraft, and (4) separation control. While considerable progress has been made in the science of laminar to turbulent transition over the last 30 years, the c- tinuing increase in computer power as well as new theoretical developments are now revolutionizing the area. It is now starting to be possible to move from simple 1D eigenvalue problems in canonical ?ows to global modes in complex ?ows, all - companied by accurate large-scale direct numerical simulations (DNS). Here, novel experimental techniques such as modern particle image velocimetry (PIV) also have an important role. Theoretically the in?uence of non-normality on the stability and transition is gaining importance, in particular for complex ?ows. At the same time the enigma of transition in the oldest ?ow investigated, Reynolds pipe ?ow tran- tion experiment, is regaining attention. Ideas from dynamical systems together with DNS and experiments are here giving us new insights.
Icase Semiannual Report
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Author :
language : en
Publisher:
Release Date : 2002
Icase Semiannual Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
This report summarizes research conducted at ICASE in applied mathematics, computer science, fluid mechanics, and structures and material sciences during the period October 1, 2000 through March 31, 2001.
Progress In Industrial Mathematics At Ecmi 2006
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Author : Luis L. Bonilla
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-12-24
Progress In Industrial Mathematics At Ecmi 2006 written by Luis L. Bonilla and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-12-24 with Mathematics categories.
Proceedings from the 14th European Conference for Mathematics in Industry held in Madrid present innovative numerical and mathematical techniques. Topics include the latest applications in aerospace, information and communications, materials, energy and environment, imaging, biology and biotechnology, life sciences, and finance. In addition, the conference also delved into education in industrial mathematics and web learning.
Mathematical Modeling And Simulation In Hydrodynamic Stability
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Author : Daniel N. Riahi
language : en
Publisher: World Scientific
Release Date : 1996
Mathematical Modeling And Simulation In Hydrodynamic Stability written by Daniel N. Riahi and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Science categories.
Hydrodynamic stability is of fundamental importance in the mechanics of fluids and is mainly concerned with the problem of the transition to turbulence. This book is devoted to publication of original research papers, research-expository and survey articles with an emphasis on unsolved problems and open questions in the mathematical modeling and computational aspects of hydrodynamic stability. Review chapters on the mathematical modeling and numerical simulation aspects of hydrodynamic stability, the physical background, and the limitations of the modeling and simulation procedures, due to particular mathematical or computational methods used, are included. This book will be appropriate for use in research and in research-related courses on the subject. It includes chapters on bifurcations in fluid systems, flow patterns, channel flows, non-parallel shear flows, thin-film flows, strong viscous shear flows, Gortler vortices, bifurcations in convection, wavy film flows and boundary layers.
Nasa Langley Scientific And Technical Information Output 2001
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Author :
language : en
Publisher:
Release Date : 2002
Nasa Langley Scientific And Technical Information Output 2001 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Perspectives In Fluid Dynamics
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Author : G. K. Batchelor
language : en
Publisher: Cambridge University Press
Release Date : 2003
Perspectives In Fluid Dynamics written by G. K. Batchelor and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Mathematics categories.
Now available in paperback, this wide-ranging text on modern fluid mechanics research includes sections on modelling the environment, physiology and magnetohydrodynamics. At the same time, the book discusses basic physical phenomena such as turbulence that still present fundamental challenges. Conventional textbooks cannot hope to give graduate students more than an inkling of what topics are currently being researched, or how to make a choice between them. This book aims to rectify matters, at least in part. It consists of eleven chapters that each introduces a different branch of the subject. Though not exhaustive, the coverage is broad: thin-film flows, Saffman-Taylor fingering, flows in arteries and veins, convective and absolute instabilities, turbulence, natural convection, magnetohydrodynamics, solidification, geological fluid mechanics, oceanography and atmospheric dynamics are all introduced and reviewed by established authorities. Thus the book will not only be suitable for graduate-level courses but also for specialists seeking introductions to other areas.
04 2527 04 2554
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Author :
language : en
Publisher:
Release Date : 2004
04 2527 04 2554 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Fluid dynamics categories.