Dynamics And Geometry Of Turbulent Flows

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Dynamics And Geometry Of Turbulent Flows

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Author : Reuven Zeitak
language : en
Publisher:
Release Date : 1996

Dynamics And Geometry Of Turbulent Flows written by Reuven Zeitak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

The Global Geometry Of Turbulence

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Author : Javier Jiménez
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

The Global Geometry Of Turbulence written by Javier Jiménez 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 2012-12-06 with Science categories.

The aim of this Advanced Research Workshop was to bring together Physicists, Applied Mathematicians and Fluid Dynamicists, including very specially experimentalists, to review the available knowledge on the global structural aspects of turbulent flows, with an especial emphasis on open systems, and to try to reach a consensus on their possible relationship to recent advances in the understanding of the behaviour of low dimensional dynamical systems and amplitude equations. A lot has been learned during recent years on the non-equilibrium behaviour of low dimen sional dynamical systems, including some fluid flows (Rayleigh-Benard, Taylor-Couette, etc. ). These are mostly closed flows and many of the global structural features of the low dimensional systems have been observed in them, including chaotic behaviour, period doubling, intermit tency, etc. . It has also been shown that some of these flows are intrinsically low dimensional, which accounts for much of the observed similarities. Open flows seem to be different, and experimental observations point to an intrinsic high dimensionality. However, some of the tran sitional features of the low dimensional systems have been observed in them, specially in the intermittent behaviour of subcritical flows (pipes, channels, boundary layers with suction, etc. ), and in the large scale geometry of coherent structures of free shear flows (mixing layers, jets and wakes).

Some Aspects Of The Geometry Of The Dynamics And Scaling Of Turbulent Flows

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Author : Daniel Segel
language : en
Publisher:
Release Date : 1996

Some Aspects Of The Geometry Of The Dynamics And Scaling Of Turbulent Flows written by Daniel Segel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

New Approaches And Concepts In Turbulence

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Author : T. Dracos
language : en
Publisher: Birkhäuser
Release Date : 2012-12-06

New Approaches And Concepts In Turbulence written by T. Dracos and has been published by Birkhäuser this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.

This book contains the proceedings of a colloquium held in Monte Verit from September 9-13, 1991. Special care has been taken to devote adequate space to the scientific discussions, which claimed about half of the time available. Scientists from all over the world presented their views on the importance of kinematic properties, topology and fractal geometry, and on the dynamic behaviour of turbulent flows. They debated the importance of coherent structures and the possibility to incorporate these in the statistical theory of turbulence, as well as their significance for the reduction of the degrees of freedom and the prospective of dynamical systems and chaos approaches to the problem of turbulence. Also under discussion was the relevance of these new approaches to the study of the instability and the origin of turbulence, and the importance of numerical and physical experiments in improving the understanding of turbulence.

Computational Fluid Dynamics

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Author : Takeo Kajishima
language : en
Publisher: Springer
Release Date : 2016-10-01

Computational Fluid Dynamics written by Takeo Kajishima and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-01 with Technology & Engineering categories.

This textbook presents numerical solution techniques for incompressible turbulent flows that occur in a variety of scientific and engineering settings including aerodynamics of ground-based vehicles and low-speed aircraft, fluid flows in energy systems, atmospheric flows, and biological flows. This book encompasses fluid mechanics, partial differential equations, numerical methods, and turbulence models, and emphasizes the foundation on how the governing partial differential equations for incompressible fluid flow can be solved numerically in an accurate and efficient manner. Extensive discussions on incompressible flow solvers and turbulence modeling are also offered. This text is an ideal instructional resource and reference for students, research scientists, and professional engineers interested in analyzing fluid flows using numerical simulations for fundamental research and industrial applications.

Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations

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Author : R. C. Buggeln
language : en
Publisher:
Release Date : 1980

Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations written by R. C. Buggeln and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Laminar flow categories.

Both laminar and turbulent flows in strongly curved ducts, channels, and pipes are studied by numerical methods. The study concentrates on the curved square-duct geometry and flow conditions for which detailed measurements have been obtained recently by Taylor, Whitelaw, and Yianneskis. The solution methodology encompasses solution of the compressible ensemble-averaged Navier-Stokes equations at low Mach number using a split linearized block implicit (LBI) scheme, and rapid convergence on the order of 80 noniterative time steps is obtained. The treatment of turbulent flows includes resolution of the viscous sublayer region. A series of solutions for both laminar and turbulent flow and for both two- and three-dimensional geometries of the same curvature are presented. The accuracy of these solutions is explored by mesh refinement and by comparison with experiment. In summary, good qualitative and reasonable quantitative agreement between solution and experiment is obtained. Collectively, this sequence of results serves to clarify the physical structure of these flows and hence how grid selection procedures might be adjusted to improve the numerical accuracy and experimental agreement. For a three-dimensional flow of considerable complexity, the relatively good agreement with experiment obtained for the turbulent flow case despite a coarse grid must be regarded as encouraging. (Author).

Homogeneous Turbulence Dynamics

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Author : Pierre Sagaut
language : en
Publisher: Springer
Release Date : 2018-03-23

Homogeneous Turbulence Dynamics written by Pierre Sagaut and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-23 with Science categories.

This book provides state-of-the-art results and theories in homogeneous turbulence, including anisotropy and compressibility effects with extension to quantum turbulence, magneto-hydodynamic turbulence and turbulence in non-newtonian fluids. Each chapter is devoted to a given type of interaction (strain, rotation, shear, etc.), and presents and compares experimental data, numerical results, analysis of the Reynolds stress budget equations and advanced multipoint spectral theories. The role of both linear and non-linear mechanisms is emphasized. The link between the statistical properties and the dynamics of coherent structures is also addressed. Despite its restriction to homogeneous turbulence, the book is of interest to all people working in turbulence, since the basic physical mechanisms which are present in all turbulent flows are explained. The reader will find a unified presentation of the results and a clear presentation of existing controversies. Special attention is given to bridge the results obtained in different research communities. Mathematical tools and advanced physical models are detailed in dedicated chapters.

Computational Fluid Dynamics Simulations Of Fully Developed Turbulent Flows With Newtonian And Non Newtonian Drag Reduction Fluids In The Cylindrical Geometry

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Author : Xiao Xiong
language : en
Publisher:
Release Date : 2020

Computational Fluid Dynamics Simulations Of Fully Developed Turbulent Flows With Newtonian And Non Newtonian Drag Reduction Fluids In The Cylindrical Geometry written by Xiao Xiong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

While turbulent flows with the dynamic and sinuous flow pattern have a wide variety of engineering applications in enhancing fluid mixing and heat/mass transfer, they unfavorably lead to dramatic increases in friction drags that need to be eased. The polymer induced drag reduction, first discovered by Toms in 1948, is one of the most efficient techniques to achieve so, which has the capability of reducing the friction drag in turbulent flows by up to 80%. As a result, it has been broadly used for anticorrosion in oil and gas conduits, energy loss prevention in irrigation, water heating/cooling systems and sewer systems, improving hydraulic fracturing in reservoir engineering, and enhancing cutting transport for extended-reach well in drilling engineering. Despite being studied for over 70 years, many problems in this research area are still waiting to be solved. In particular, to accurately predict drag reduction numerically remains challenging, especially in engineering problems where flows with large Reynolds numbers in complex geometries widely exist. Consequently, in this study, a reliable numerical approach has been proposed in the computationally inexpensive Reynolds-averaged-Navier-Stokes (RANS) framework to estimate polymer induced drag reduction in the cylindrical geometry, with the rheological behavior of polymer solutions represented by the finitely-extensible nonlinear-elastic model with Peterlin's function (FENE-P model) and the turbulent flow field characterized by the k-e-v2-f model, both coded into the commercial software of FLUENT using the User-Defined-Function (UDF). ANSYS 14.0 is used to complete all the simulations, CFX for the base case Newtonian flow and FLUENT for the drag reduction flow. By using the correlations suggested in this study to determine the essential rheological parameters, simulation results are validated successfully against experimental studies, showing the robust performance of the proposed model to predict accurate drag reduction in the cylindrical geometry for solutions with both rigid and non-rigid flexible polymers. By comparing behaviors of the non-Newtonian drag reduction and the Newtonian fluids in the concentric annulus, where the geometrical transverse curvature effect plays a vital role in determining the flow field, polymers are found to behave differently close to the inner and outer walls of the annulus, leading to more decay of turbulence at the outer wall than the inner. Such a phenomenon has been explained by relating the elongation of the polymer chains in the solution to the intensity of the flow field they experience, which is also found in this study to be highly dependent on the inherent rheological properties of themselves. This thesis provides a benchmark study about how the polymer induced turbulent drag reduction in the cylindrical geometry can be numerically estimated using RANS modelling. Substantial progress has also been made in understanding the geometry-dependent behavior of polymers in the turbulent flow, which could inspire research on broader applications of the polymer induced drag reduction in more complex geometries.

Turbulence

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Author : Frans T.M. Nieuwstadt
language : en
Publisher: Springer
Release Date : 2016-07-04

Turbulence written by Frans T.M. Nieuwstadt and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-07-04 with Science categories.

This book provides a general introduction to the topic of turbulent flows. Apart from classical topics in turbulence, attention is also paid to modern topics. After studying this work, the reader will have the basic knowledge to follow current topics on turbulence in scientific literature. The theory is illustrated with a number of examples of applications, such as closure models, numerical simulations and turbulent diffusion, and experimental findings. The work also contains a number of illustrative exercises Review from the Textbook & Academic Authors Association that awarded the book with the 2017 Most Promising New Textbook Award: “Compared to other books in this subject, we find this one to be very up-to-date and effective at explaining this complicated subject. We certainly would highly recommend it as a text for students and practicing professionals who wish to expand their understanding of modern fluid mechanics.”

Iutam Symposium On Geometry And Statistics Of Turbulence

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Author : T. Kambe
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-14

Iutam Symposium On Geometry And Statistics Of Turbulence written by T. Kambe 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 2013-03-14 with Science categories.

This volume contains the papers presented at the IUTAM Symposium on Geometry and Statistics of Turbulence, held in November 1999, at the Shonan International Village Center, Hayama (Kanagawa-ken), Japan. The Symposium was proposed in 1996, aiming at organizing concen trated discussions on current understanding of fluid turbulence with empha sis on the statistics and the underlying geometric structures. The decision of the General Assembly of International Union of Theoretical and Applied Mechanics (IUTAM) to accept the proposal was greeted with enthusiasm. Turbulence is often characterized as having the properties of mixing, inter mittency, non-Gaussian statistics, and so on. Interest is growing recently in how these properties are related to formation and evolution of struc tures. Note that the intermittency is meant for passive scalars as well as for turbulence velocity or rate of dissipation. There were eighty-eight participants in the Symposium. They came from thirteen countries, and fifty-seven papers were presented. The presenta tions comprised a wide variety of fundamental subjects of mathematics, statistical analyses, physical models as well as engineering applications. Among the subjects discussed are (a) Degree of self-similarity in cascade, (b) Fine-scale structures and degree of Markovian property in turbulence, (c) Dynamics of vorticity and rates of strain, (d) Statistics associated with vortex structures, (e) Topology, structures and statistics of passive scalar advection, (f) Partial differential equations governing PDFs of velocity in crements, (g) Thermal turbulences, (h) Channel and pipe flow turbulences, and others.