Download or read book Structure and Transport in Wall Turbulence written by Dimitrios Vassilios Papavassiliou and published by . This book was released on 1996 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct numerical simulation techniques are used to study wall turbulence and turbulent dispersion. Turbulent dispersion using a Lagrangian approach is studied. Heat or mass markers are released from sources located at the wall of the channel and their trajectories are monitored. The Lagrangian point of view is that scalar transport is the result of the behavior of a sum of these sources. This approach allows the study of turbulent transport at different Prandtl (or Schmidt) numbers, Pr = 0.1 (liquid metals), Pr = 0.7 (air), Pr = 10 (water) to Pr = 100 and 2400 (heavy oils). It also allows the study of different configurations such as dispersion from a line source, heat transfer from a heated plate, heat transfer between a hot and a cold wall and heat transfer between two heated walls. The most interesting result is that the behavior of a single instantaneous point source at the wall can be used as a building block to describe a variety of problems. An Eulerian simulation at Pr = 10 was also carried out. A comparison between results from existing Eulerian DNS with the Lagrangian results shows excellent agreement. Eulerian DNS simulations for Pr $>$ 10 are not currently available. However, Lagrangian simulations at high Pr are possible and offer unique opportunities. In order to study the coherent structures of turbulence in the logarithmic layer, a plane Couette flow simulation is developed. The total stress is constant throughout the Couette channel, providing a logarithmic layer that extends to the center of the channel. A very important result is that backscattering of turbulent kinetic energy feeds energy from small scale turbulence to large scale structures. One implication of this finding is that subgrid modeling in large eddy simulations should take into account backscattering even at simple geometries. A channel flow simulation at double the Reynolds number (Re = 5750) of that used for the Couette flow simulation is documented. The scope is to obtain a thicker logarithmic layer and to compare with results at half Reynolds number. The effect of Re on turbulence statistics and the structure of turbulence is investigated as well as the scaling of turbulence quantities in the inner and outer flow regions.
Download or read book Transport and Coherent Structures in Wall Turbulence written by Sedat Tardu and published by John Wiley & Sons. This book was released on 2014-09-10 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wall bounded turbulent flows are of major importance in industrial and environmental fluid mechanics. The structure of the wall turbulence is intrinsically related to the coherent structures that play a fundamental role in the transport process. The comprehension of their regeneration mechanism is indispensable for the development of efficient strategies in terms of drag control and near wall turbulence management. This book provides an up-to-date overview on the progress made in this specific area in recent years.
Download or read book The Structure of Wall Turbulence and Its Relation to Eddy Transport written by Larry Dean Eckelman and published by . This book was released on 1971 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transport and Coherent Structures in Wall Turbulence written by Sedat Tardu and published by John Wiley & Sons. This book was released on 2014-10-06 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wall bounded turbulent flows are of major importance in industrial and environmental fluid mechanics. The structure of the wall turbulence is intrinsically related to the coherent structures that play a fundamental role in the transport process. The comprehension of their regeneration mechanism is indispensable for the development of efficient strategies in terms of drag control and near wall turbulence management. This book provides an up-to-date overview on the progress made in this specific area in recent years.
Download or read book Statistical Approach to Wall Turbulence written by Sedat Tardu and published by John Wiley & Sons. This book was released on 2013-02-07 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wall turbulence is encountered in many technological applications as well as in the atmosphere, and a detailed understanding leading to its management would have considerable beneficial consequences in many areas. A lot of inspired work by experimenters, theoreticians, engineers and mathematicians has been accomplished over recent decades on this important topic and Statistical Approach to Wall Turbulence provides an updated and integrated view on the progress made in this area. Wall turbulence is a complex phenomenon that has several industrial applications, such as in aerodynamics, turbomachinery, geophysical flows, internal engines, etc. Several books exist on fluid turbulence, but Statistical Approach to Wall Turbulence is original in the sense that it focuses solely on the turbulent flows bounded by solid boundaries. The book covers the different physical aspects of wall turbulence, beginning with classical phenomenological aspects before advancing to recent research in the effects of the Reynolds numbers, near wall coherent structures, and wall turbulent transport process. This book would be of interest to postgraduate and undergraduate students in mechanical, chemical, and aerospace engineering, as well as researchers in aerodynamics, combustion, and all applications of wall turbulence.
Download or read book The Structure of Turbulent Shear Flow written by A. A. R. Townsend and published by Cambridge University Press. This book was released on 1976 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Develops a physical theory from the mass of experimental results, with revisions to reflect advances of recent years.
Download or read book Wall Turbulence Control written by Sedat Tardu and published by John Wiley & Sons. This book was released on 2017-05-01 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wall turbulence control is a major subject, the investigation of which involves significant industrial, environmental and fundamental consequences. Wall Turbulence Control addresses recent advances achieved in active and passive wall turbulence control over the past two decades. This valuable reference for scientists, researchers and engineers provides an updated view of the research into this topic, including passive control, optimal and suboptimal control methodology, linear control and control using adaptive methods (neural networks), polymer and bubble injection, electromagnetic control and recent advances in control by plasma.
Download or read book Self sustaining Mechanisms of Wall Turbulence written by Ronald Lee Panton and published by Computational Mechanics. This book was released on 1997 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Why is wall turbulence self-sustaining? In this book well-regarded researchers not only discuss what they know and believe, but also speculate on ideas that still require numerical or experimental testing and verification. An initial brief history of boundary layer structure research is followed by chapters on experimental information and specific topics within the subject. There are then sections on computational aspects.
Download or read book Turbulence Structure and Transport Mechanisms in Liquid Streams Bounded by a Wall and a Gas liquid Interface written by Mehdi Rashidi and published by . This book was released on 1989 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Basics of Engineering Turbulence written by David Ting and published by Academic Press. This book was released on 2016-02-23 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Basics of Engineering Turbulence introduces flow turbulence to engineers and engineering students who have a fluid dynamics background, but do not have advanced knowledge on the subject. It covers the basic characteristics of flow turbulence in terms of its many scales. The author uses a pedagogical approach to help readers better understand the fundamentals of turbulence scales, especially how they are derived through the order of magnitude analysis. This book is intended for those who have an interest in flowing fluids. It provides some background, though of limited scope, on everyday flow turbulence, especially in engineering applications. The book begins with the ‘basics’ of turbulence which is necessary for any reader being introduced to the subject, followed by several examples of turbulence in engineering applications. This overall approach gives readers all they need to grasp both the fundamentals of turbulence and its applications in practical instances. Focuses on the basics of turbulence for applications in engineering and industrial settings Provides an understanding of concepts that are often challenging, such as energy distribution among the turbulent structures, the effective diffusivity, and the theory behind turbulence scales Offers a user-friendly approach with clear-and-concise explanations and illustrations, as well as end-of-chapter problems
Download or read book Progress in Wall Turbulence Understanding and Modeling written by Michel Stanislas and published by Springer Science & Business Media. This book was released on 2010-10-26 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will consist of a coherent collection of recent results on near wall turbulence including theory, new experiments, DNS, and modeling with RANS, LES and Low Order Dynamical Systems.
Download or read book Turbulence Structure and Modulation written by Alfredo Soldati and published by Springer. This book was released on 2014-05-04 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlling turbulence is an important issue for a number of technological applications. Several methods to modulate turbulence are currently being investigated. This book describes various aspects of turbulence structure and modulation, and explains and discusses the most promising techniques in detail.
Download or read book NBS Special Publication written by and published by . This book was released on 1980 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure of the Near Wall Region in a Turbulent Flow written by Zahir U. A. Warsi and published by . This book was released on 1976 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper analyzes the wall region of a turbulent flow on the basis of the models as proposed by Kolmogorov and Saffman by including the effect of molecular viscosity in the transport equations. Neither Kolmogorov's nor Saffman's models could predict the experimental distribution of the Laufer's experimental data on turbulence energy when the experimental velocity distribution was used in the energy transport equation. In this paper a heuristic modification for the wall region is proposed which yields values of turbulence energy in agreement with the experimental data. Further, the proposed model asymptotically tends to Kolmogorov's model for the fully developed part of the flow. The analysis and results of this paper provide values of the eddy viscosity in the wall region which can be used in the solution of the equations of mean turbulence having terms depending on the molecular viscosity.
Download or read book Engineering Turbulence Modelling and Experiments 5 written by W. Rodi and published by Elsevier. This book was released on 2002-08-21 with total page 1029 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence is one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends increasingly on the performance of the turbulence models. This series of symposia provides a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The papers in this set of proceedings were presented at the 5th International Symposium on Engineering Turbulence Modelling and Measurements in September 2002. They look at a variety of areas, including: Turbulence modelling; Direct and large-eddy simulations; Applications of turbulence models; Experimental studies; Transition; Turbulence control; Aerodynamic flow; Aero-acoustics; Turbomachinery flows; Heat transfer; Combustion systems; Two-phase flows. These papers are preceded by a section containing 6 invited papers covering various aspects of turbulence modelling and simulation as well as their practical application, combustion modelling and particle-image velocimetry.
Download or read book Ten Chapters in Turbulence written by Peter A. Davidson and published by Cambridge University Press. This book was released on 2012-12-06 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence is ubiquitous in science, technology and daily life and yet, despite years of research, our understanding of its fundamental nature is still tentative and incomplete. More generally, the tools required for a deep understanding of strongly interacting many-body systems remain underdeveloped. Inspired by a research programme held at the Newton Institute in Cambridge, this book contains reviews by leading experts that summarize our current understanding of the nature of turbulence from theoretical, experimental, observational and computational points of view. The articles cover a wide range of topics, including the scaling and organized motion in wall turbulence, small scale structure, dynamics and statistics of homogeneous turbulence, turbulent transport and mixing, and effects of rotation, stratification and magnetohydrodynamics, as well as superfluidity. The book will be useful to researchers and graduate students interested in the fundamental nature of turbulence at high Reynolds numbers.
Download or read book Turbulence written by P. Bradshaw and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent transport of momentum, heat and matter dominates many of the fluid flows found in physics, engineering and the environmental sciences. Complicated unsteady motions which mayor may not count as turbulence are found in interstellar dust clouds and in the larger blood vessels. The fascination of this nonlinear, irreversible stochastic process for pure scientists is demonstrated by the contributions made to its understanding by several of the most distinguished mathematical physicists of this century, and its importance to engineers is evident from the wide variety of industries which have contributed to, or benefit from, our current knowledge. Several books on turbulence have appeared in recent years. Taken collectively, they illustrate the depth of the subject, from basic principles accessible to undergraduates to elaborate mathematical solutions representing many years of work, but there is no one account which emphasizes its breadth. For this, a multi-author work is necessary. This book is an introduction to our state of knowledge of turbulence in most of the branches of science which have contributed to that knowledge. It is not a Markovian sequence of unrelated essays, and we have not simply assembled specialized accounts of turbulence problems in each branch; this book is a unified treatment, with the material classified according to phenomena rather than application, and freed as far as possible from discipline-oriented detail. The approach is "applied" rather than "pure" with the aim of helping people who need to under stand or predict turbulence in real life.
