Physics of Transitional 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 Physics of Transitional Shear Flows write by Andrey V. Boiko. This book was released on 2011-09-15. Physics of Transitional Shear Flows available in PDF, EPUB and Kindle. Starting from fundamentals of classical stability theory, an overview is given of the transition phenomena in subsonic, wall-bounded shear flows. At first, the consideration focuses on elementary small-amplitude velocity perturbations of laminar shear layers, i.e. instability waves, in the simplest canonical configurations of a plane channel flow and a flat-plate boundary layer. Then the linear stability problem is expanded to include the effects of pressure gradients, flow curvature, boundary-layer separation, wall compliance, etc. related to applications. Beyond the amplification of instability waves is the non-modal growth of local stationary and non-stationary shear flow perturbations which are discussed as well. The volume continues with the key aspect of the transition process, that is, receptivity of convectively unstable shear layers to external perturbations, summarizing main paths of the excitation of laminar flow disturbances. The remainder of the book addresses the instability phenomena found at late stages of transition. These include secondary instabilities and nonlinear features of boundary-layer perturbations that lead to the final breakdown to turbulence. Thus, the reader is provided with a step-by-step approach that covers the milestones and recent advances in the laminar-turbulent transition. Special aspects of instability and transition are discussed through the book and are intended for research scientists, while the main target of the book is the student in the fundamentals of fluid mechanics. Computational guides, recommended exercises, and PowerPoint multimedia notes based on results of real scientific experiments supplement the monograph. These are especially helpful for the neophyte to obtain a solid foundation in hydrodynamic stability. To access the supplementary material go to extras.springer.com and type in the ISBN for this volume.
Intermittency in Transitional Shear Flows
Intermittency in Transitional 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 Intermittency in Transitional Shear Flows write by Yohann Duguet. This book was released on 2021-08-31. Intermittency in Transitional Shear Flows available in PDF, EPUB and Kindle. This book contains original peer-reviewed articles written by some of the most prominent international physicists active in the field of hydrodynamics. The topic is entirely devoted to the study of the transitional regimes of incompressible viscous flow found at the onset of turbulent flows. Nine articles written for this 2020 Special Issue of the journal Entropy (MDPI) have been gathered at the crossroads of fluid mechanics, statistical physics, complexity theory, and applied mathematics. They include experimental, analytic, and computational material of an academic level that has not been published anywhere else.
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.
Intermittency in Transitional Shear Flows
Intermittency in Transitional 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 Intermittency in Transitional Shear Flows write by Yohann Duguet. This book was released on 2021. Intermittency in Transitional Shear Flows available in PDF, EPUB and Kindle. This book contains original peer-reviewed articles written by some of the most prominent international physicists active in the field of hydrodynamics. The topic is entirely devoted to the study of the transitional regimes of incompressible viscous flow found at the onset of turbulent flows. Nine articles written for this 2020 Special Issue of the journal Entropy (MDPI) have been gathered at the crossroads of fluid mechanics, statistical physics, complexity theory, and applied mathematics. They include experimental, analytic, and computational material of an academic level that has not been published anywhere else.
Prediction of Transitional Boundary Layers and Fully Turbulent Free Shear Flows, Using Reynolds Averaged Navier-Stokes Models
Prediction of Transitional Boundary Layers and Fully Turbulent Free Shear Flows, Using Reynolds Averaged Navier-Stokes Models - 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 Prediction of Transitional Boundary Layers and Fully Turbulent Free Shear Flows, Using Reynolds Averaged Navier-Stokes Models write by Maurin Lopez. This book was released on 2014. Prediction of Transitional Boundary Layers and Fully Turbulent Free Shear Flows, Using Reynolds Averaged Navier-Stokes Models available in PDF, EPUB and Kindle. One of the biggest unsolved problems of modern physics is the turbulence phenomena in fluid flow. The appearance of turbulence in a flow system is regularly determined by velocity and length scales of the system. If those scales are small the motion of the fluid is laminar, but at larger scales, disturbances appear and grow, leading the flow field to transition to a fully turbulent state. The prediction of transitional flow is critical for many complex fluid flow applications, such as aeronautical, aerospace, biomedical, automotive, chemical processing, heating and cooling systems, and meteorology. For example, in some cases the flow may remain laminar throughout a significant portion of a given domain, and fully turbulent simulations may produce results that can lead to inaccurate conclusions or inefficient design, due to an inability to resolve the details of the transition process. This work aims to develop, implement, and test a new model concept for the prediction of transitional flows using a linear eddy-viscosity RANS approach. The effects of transition are included through one additional transport equation for u2 as an alternative to the Laminar Kinetic Energy (LKE) framework. Here u2 is interpreted as the energy of fully turbulent, three-dimensional velocity fluctuations. This dissertation presents two new single-point, physics-based turbulence models based on the transitional methodology mentioned above. The first one uses an existing transitional model as a baseline which is modified to accurately capture the physics of fully turbulent free shear flows. The model formulation was tested over several boundary layer and free shear flow test cases. The simulations show accurate results, qualitatively equal to the baseline model on transitional boundary layer test cases, and substantially improved over the baseline model for free shear flows. The second model uses the SST k-w fully turbulent model and again the effects of transition are included through one additional transport equation for u2. An initial version of the model is presented here. Simplicity of the formulation and ease of extension to other baseline models are two potential advantages of the new method.
