Direct Numerical Simulation Of Very Large Scale Motions In Turbulent Pipe Flow

Author : Christian Bauer
Publisher : Cuvillier Verlag
Page : 244 pages
File Size : 53,8 Mb
Release : 2021-02-01
Category : Technology & Engineering
ISBN : 9783736963696

Get Book

Direct Numerical Simulation of Very-Large-Scale Motions in Turbulent Pipe Flow by Christian Bauer Pdf

Die turbulente Rohrströmung ist nicht nur von großer Bedeutung für Anwendungen im Ingenieurbereich, sondern auch für die Grundlagenforschung von wandnaher Turbulenz. In der vorliegenden Arbeit wird die Interaktion sogenannter turbulenter Superstrukturen (engl.: very-large-scale motions, VLSMs) mit der kleinskaligen Wandturbulenz auf Basis der Methode der direkten numerischen Simulation untersucht. Dabei werden Schubspannungs-Reynoldszahlen bis Reτ = 2880 und Rohrlängen bis L = 42R berücksichtigt. Es wird das Konvergenz- und Skalierungsverhalten verschiedener statistischer Momente der Geschwindigkeitsverteilung untersucht und in Bezug auf VLSMs diskutiert. Die folgende Analyse der axialen Energietransportgleichung des gefilterten Geschwindigkeitsfeldes legt offen, dass VLSMs Energie von der mittleren Strömung zugeführt bekommen, ähnlich den kleinskaligen Strukturen durch den turbulenten Produktionsmechanismus. Die verschiedenen Terme der Energiebilanz werden sowohl anhand von mittleren Profilen, als auch instantanen Strömungsvisualisierungen und drei-dimensionalen Korrelationen diskutiert, wobei auch auf das Phänomen der inversen turbulenten Energiekaskade eingegangen wird. Die Forschungsarbeit gewährt dabei neue Einblicke in die Interaktion der VLSMs mit dem turbulenten Wandzyklus und trägt zum besseren Verständnis der turbulenten Rohrströmung bei. Turbulent pipe flow is not only of importance to engineering applications but also of fundamental interest to the study of wall-bounded turbulence. In the present work, the interaction of the so-called very-large-scale motions (VLSMs) with the near-wall, small-scale turbulence is explored by means of direct numerical simulation for friction Reynolds numbers up to Reτ = 2880 and pipe lengths up to L = 42R. Besides, the convergence and the scaling of different order moments of the velocity distribution are studied and also discussed with regard to VLSMs. The subsequent analysis of the streamwise energy budget equation of the filtered velocity field reveals that VLSMs obtain their energy from the mean velocity field via a production mechanism similar to the one known from the near-wall cycle. Moreover, the different energy budget terms are investigated by means of statistical averages, instantaneous flow field visualisations, and three-dimensional correlations, wherein the backscattering phenomenon is also dealt with. In brief, the research sheds new light on our understanding of the interaction between VLSMs and the near-wall cycle and leads to a better grasp of turbulent pipe flow in general.

Author : Michel Deville,Christophe Calvin,Vincent Couaillier,Marta De La Llave Plata,Jean-Luc Estivalèzes,Thiên Hiêp Lê,Stéphane Vincent
Publisher : Springer
Page : 218 pages
File Size : 52,9 Mb
Release : 2022-02-18
Category : Technology & Engineering
ISBN : 3030658228

Get Book

Turbulence and Interactions by Michel Deville,Christophe Calvin,Vincent Couaillier,Marta De La Llave Plata,Jean-Luc Estivalèzes,Thiên Hiêp Lê,Stéphane Vincent Pdf

This book presents a snapshot of the state-of-art in the field of turbulence modeling, with an emphasis on numerical methods. Topics include direct numerical simulations, large eddy simulations, compressible turbulence, coherent structures, two-phase flow simulation and many more. It includes both theoretical contributions and experimental works, as well as chapters derived from keynote lectures, presented at the fifth Turbulence and Interactions Conference (TI 2018), which was held on June 25-29 in Martinique, France. This multifaceted collection, which reflects the conference ́s emphasis on the interplay of theory, experiments and computing in the process of understanding and predicting the physics of complex flows and solving related engineering problems, offers a timely guide for students, researchers and professionals in the field of applied computational fluid dynamics, turbulence modeling and related areas.

Author : Hans Kuerten,Bernard Geurts,Vincenzo Armenio,Jochen Fröhlich
Publisher : Springer Science & Business Media
Page : 460 pages
File Size : 40,6 Mb
Release : 2011-10-05
Category : Computers
ISBN : 9789400724822

Get Book

Direct and Large-Eddy Simulation VIII by Hans Kuerten,Bernard Geurts,Vincenzo Armenio,Jochen Fröhlich Pdf

This volume continues previous DLES proceedings books, presenting modern developments in turbulent flow research. It is comprehensive in its coverage of numerical and modeling techniques for fluid mechanics. After Surrey in 1994, Grenoble in 1996, Cambridge in 1999, Enschede in 2001, Munich in 2003, Poitiers in 2005, and Trieste in 2009, the 8th workshop, DLES8, was held in Eindhoven, The Netherlands, again under the auspices of ERCOFTAC. Following the spirit of the series, the goal of this workshop is to establish a state-of-the-art of DNS and LES techniques for the computation and modeling of transitional/turbulent flows covering a broad scope of topics such as aerodynamics, acoustics, combustion, multiphase flows, environment, geophysics and bio-medical applications. This gathering of specialists in the field was a unique opportunity for discussions about the more recent advances in the prediction, understanding and control of turbulent flows in academic or industrial situations.

Author : G. Biswas,V. Eswaran
Publisher : CRC Press
Page : 478 pages
File Size : 45,6 Mb
Release : 2002
Category : Technology & Engineering
ISBN : 0849310148

Get Book

Turbulent Flows by G. Biswas,V. Eswaran Pdf

This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and plumes. The modeling section focuses on topics such as eddy viscosity models, standard K-E Models, Direct Numerical Stimulation, Large Eddy Simulation, and their applications. The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section. Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and more.

Author : William Layton
Publisher : MDPI
Page : 229 pages
File Size : 53,7 Mb
Release : 2018-05-04
Category : Electronic
ISBN : 9783038428091

Get Book

Turbulence: Numerical Analysis, Modelling and Simulation by William Layton Pdf

This book is a printed edition of the Special Issue "Turbulence: Numerical Analysis, Modelling and Simulation" that was published in Fluids

Author : Robert Moser
Publisher : Elsevier
Page : 568 pages
File Size : 52,8 Mb
Release : 2022-11-30
Category : Science
ISBN : 9780323998338

Get Book

Numerical Methods in Turbulence Simulation by Robert Moser Pdf

Numerical Methods in Turbulence Simulation provides detailed specifications of the numerical methods needed to solve important problems in turbulence simulation. Numerical simulation of turbulent fluid flows is challenging because of the range of space and time scales that must be represented. This book provides explanations of the numerical error and stability characteristics of numerical techniques, along with treatments of the additional numerical challenges that arise in large eddy simulations. Chapters are written as tutorials by experts in the field, covering specific both contexts and applications. Three classes of turbulent flow are addressed, including incompressible, compressible and reactive, with a wide range of the best numerical practices covered. A thorough introduction to the numerical methods is provided for those without a background in turbulence, as is everything needed for a thorough understanding of the fundamental equations. The small scales that must be resolved are generally not localized around some distinct small-scale feature, but instead are distributed throughout a volume. These characteristics put particular strain on the numerical methods used to simulate turbulent flows. Includes a detailed review of the numerical approximation issues that impact the simulation of turbulence Provides a range of examples of large eddy simulation techniques Discusses the challenges posed by boundary conditions in turbulence simulation and provides approaches to addressing them

Author : Trong T. Bui
Publisher : Unknown
Page : 28 pages
File Size : 53,9 Mb
Release : 1998
Category : Parallel computers
ISBN : NASA:31769000627953

Get Book

A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows by Trong T. Bui Pdf

Author : Peter R. Voke,Leonhard Kleiser,Jean-Pierre Chollet
Publisher : Springer Science & Business Media
Page : 438 pages
File Size : 45,7 Mb
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9789401110006

Get Book

Direct and Large-Eddy Simulation I by Peter R. Voke,Leonhard Kleiser,Jean-Pierre Chollet Pdf

It is a truism that turbulence is an unsolved problem, whether in scientific, engin eering or geophysical terms. It is strange that this remains largely the case even though we now know how to solve directly, with the help of sufficiently large and powerful computers, accurate approximations to the equations that govern tur bulent flows. The problem lies not with our numerical approximations but with the size of the computational task and the complexity of the solutions we gen erate, which match the complexity of real turbulence precisely in so far as the computations mimic the real flows. The fact that we can now solve some turbu lence in this limited sense is nevertheless an enormous step towards the goal of full understanding. Direct and large-eddy simulations are these numerical solutions of turbulence. They reproduce with remarkable fidelity the statistical, structural and dynamical properties of physical turbulent and transitional flows, though since the simula tions are necessarily time-dependent and three-dimensional they demand the most advanced computer resources at our disposal. The numerical techniques vary from accurate spectral methods and high-order finite differences to simple finite-volume algorithms derived on the principle of embedding fundamental conservation prop erties in the numerical operations. Genuine direct simulations resolve all the fluid motions fully, and require the highest practical accuracy in their numerical and temporal discretisation. Such simulations have the virtue of great fidelity when carried out carefully, and repre sent a most powerful tool for investigating the processes of transition to turbulence.

Author : Thomas B. Gatski,M. Yousuff Hussaini,John L. Lumley
Publisher : Oxford University Press
Page : 329 pages
File Size : 50,9 Mb
Release : 1996-07-11
Category : Science
ISBN : 9780195355567

Get Book

Simulation and Modeling of Turbulent Flows by Thomas B. Gatski,M. Yousuff Hussaini,John L. Lumley Pdf

This book provides students and researchers in fluid engineering with an up-to-date overview of turbulent flow research in the areas of simulation and modeling. A key element of the book is the systematic, rational development of turbulence closure models and related aspects of modern turbulent flow theory and prediction. Starting with a review of the spectral dynamics of homogenous and inhomogeneous turbulent flows, succeeding chapters deal with numerical simulation techniques, renormalization group methods and turbulent closure modeling. Each chapter is authored by recognized leaders in their respective fields, and each provides a thorough and cohesive treatment of the subject.

Author : Peter S. Bernard
Publisher : John Wiley & Sons
Page : 356 pages
File Size : 47,8 Mb
Release : 2019-03-11
Category : Science
ISBN : 9781119106227

Get Book

Turbulent Fluid Flow by Peter S. Bernard Pdf

A guide to the essential information needed to model and compute turbulent flows and interpret experiments and numerical simulations Turbulent Fluid Flow offers an authoritative resource to the theories and models encountered in the field of turbulent flow. In this book, the author – a noted expert on the subject – creates a complete picture of the essential information needed for engineers and scientists to carry out turbulent flow studies. This important guide puts the focus on the essential aspects of the subject – including modeling, simulation and the interpretation of experimental data - that fit into the basic needs of engineers that work with turbulent flows in technological design and innovation. Turbulent Fluid Flow offers the basic information that underpins the most recent models and techniques that are currently used to solve turbulent flow challenges. The book provides careful explanations, many supporting figures and detailed mathematical calculations that enable the reader to derive a clear understanding of turbulent fluid flow. This vital resource: • Offers a clear explanation to the models and techniques currently used to solve turbulent flow problems • Provides an up-to-date account of recent experimental and numerical studies probing the physics of canonical turbulent flows • Gives a self-contained treatment of the essential topics in the field of turbulence • Puts the focus on the connection between the subject matter and the goals of fluids engineering • Comes with a detailed syllabus and a solutions manual containing MATLAB codes, available on a password-protected companion website Written for fluids engineers, physicists, applied mathematicians and graduate students in mechanical, aerospace and civil engineering, Turbulent Fluid Flow contains an authoritative resource to the information needed to interpret experiments and carry out turbulent flow studies.

Author : Hiroji Nakagawa
Publisher : Routledge
Page : 287 pages
File Size : 48,8 Mb
Release : 2017-10-02
Category : Technology & Engineering
ISBN : 9781351406604

Get Book

Turbulence in Open Channel Flows by Hiroji Nakagawa Pdf

A review of open channel turbulence, focusing especially on certain features stemming from the presence of the free surface and the bed of a river. Part one presents the statistical theory of turbulence; Part two addresses the coherent structures in open-channel flows and boundary layers.

Author : Paul A. Libby
Publisher : CRC Press
Page : 370 pages
File Size : 54,8 Mb
Release : 1996-10-01
Category : Technology & Engineering
ISBN : 1560321008

Get Book

An Introduction To Turbulence by Paul A. Libby Pdf

Beginning with a description of turbulence, its various manifestations, and a brief history of study, this text also incorporates modern perspectives on turbulence. The text also covers such topics as intermittency and the resultant conditional sampling and averaging of turbulent flows, the role of large scale computation of the fundamental equations of fluid mechanics in providing information on variables, and asymptotic methods which are used to expose important features of turbulent flows. Meaningful exercises are included in every section.

Author : Peter S. Bernard,James M. Wallace
Publisher : John Wiley & Sons
Page : 516 pages
File Size : 45,7 Mb
Release : 2002-08-19
Category : Technology & Engineering
ISBN : 0471332194

Get Book

Turbulent Flow by Peter S. Bernard,James M. Wallace Pdf

Provides unique coverage of the prediction and experimentation necessary for making predictions. * Covers computational fluid dynamics and its relationship to direct numerical simulation used throughout the industry. * Covers vortex methods developed to calculate and evaluate turbulent flows. * Includes chapters on the state-of-the-art applications of research such as control of turbulence.

Author : Krayer, Michael Werner Tobias
Publisher : KIT Scientific Publishing
Page : 290 pages
File Size : 42,9 Mb
Release : 2023-09-11
Category : Electronic
ISBN : 9783731513100

Get Book

A hydrodynamical perspective on the turbulent transport of bacteria in rivers by Krayer, Michael Werner Tobias Pdf

The transport of bacteria in turbulent river-like environments is addressed, where bacterial populations are frequently encountered attached to solids. This transport mode is investigated by studying the transient settling of heavy particles in turbulent channel flows featuring sediment beds. A numerical method is used to fully resolve turbulence and finite-size particles, which enables the assessment of the complex interplay between flow structures, suspended solids and river sediment.

Author : Alessandro Talamelli,Martin Oberlack,Joachim Peinke
Publisher : Springer Science & Business Media
Page : 238 pages
File Size : 51,9 Mb
Release : 2013-08-26
Category : Technology & Engineering
ISBN : 9783319018607

Get Book

Progress in Turbulence V by Alessandro Talamelli,Martin Oberlack,Joachim Peinke Pdf

This volume collects the edited and reviewed contributions presented in the 5th iTi Conference in Bertinoro covering fundamental aspects in turbulent flows. In the spirit of the iTi initiative, the volume is produced after the conference so that the authors had the possibility to incorporate comments and discussions raised during the meeting. Turbulence presents a large number of aspects and problems, which are still unsolved and which challenge research communities in engineering and physical sciences both in basic and applied research. The book presents recent advances in theory related to new statistical approaches, effect of non-linearities and presence of symmetries. This edition presents new contributions related to the physics and control of laminar-turbulent transition in wall-bounded flows, which may have a significant impact on drag reduction applications. Turbulent boundary layers, at increasing Reynolds number, are the main subject of both computational and experimental long research programs aimed at improving our knowledge on scaling, energy distribution at different scales, structure eduction, roughness effects to name only a few. Like previous editions several numerical and experimental analysis of complex flows, mostly related to applications, are presented. The structure of the present book is as such that contributions have been bundled according to covering topics i.e. I Theory, II Stability, III Wall bounded flows, IV, Complex flows, V Acoustic, VI Numerical methods. The volume is dedicated to the memory of Prof. Rudolf Friedrich who prematurely died in Münster/Germany on the 16th of August 2012. In his honor the conference has started with a special session dedicated to his work.