Direct Numerical Investigations Of Dilute Dispersed Flows In Homogeneous Turbulence
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Direct Numerical Investigations Of Dilute Dispersed Flows In Homogeneous Turbulence
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Author : Aditya Uday Karnik
language : en
Publisher:
Release Date : 2012
Direct Numerical Investigations Of Dilute Dispersed Flows In Homogeneous Turbulence written by Aditya Uday Karnik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Direct Numerical Investigations Of Dilute Dispersed Flows In Homogeneous Turbulence
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Author : Aditya U. Karnik
language : en
Publisher:
Release Date : 2012
Direct Numerical Investigations Of Dilute Dispersed Flows In Homogeneous Turbulence written by Aditya U. Karnik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The motivation for the present work is to investigate particle-laden turbulent flows using accurate numerical simulations. In the present work, the carrier phase is modeled using direct numerical simulations (DNS) and the particles are tracked in a Lagrangian sense. Investigations of both one-way and two-way coupled particulate flows in homogeneous isotropic turbulence have been carried out. The phenomenon of interest in one-way coupled simulations is preferential accumulation, which refers to the tendency of heavy particles in isotropic turbulence to collect in regions of high strain and low vorticity. Several measures and mechanisms of accumulation have been reported in the literature often showing conflicting scaling with particle and fluid parameters. In the present study, accumulation has been quantified using several indicators to give a unified picture. The present work addresses the scaling of preferential accumulation with Reynolds number and suggests that while the spacing between particle clusters does exhibit a dependence on Reynolds number, the structure of particle clusters as viewed by individual particles shows little dependence on Reynolds number. The effect of adding a gravitational settling force on the particles has also been explored. While the gravity force tends to homogenize the particle distribution at low Stokes numbers, at high Stokes numbers it tends to arrange the originally random distribution into streaks in the direction of gravity. The ability of the Lorentz force to limit preferential accumulation has been the focus of the next part of the study. Charges are placed on particles to produce an electric field when the particles are inhomogeneously distributed. The electric field and thereby the Lorentz force tend to homogenize the particle distribution. It is interesting to note that the particle distribution attains a stationary state determined by the total amount of charge contained in the domain. It is demonstrated that in the presence of gravity, less amount of charge is required to homogenise particle distribution. Good agreement is observed for simulations of settling charged particles with experimental work. The modification of carrier phase turbulence by particles is studied formono-sized particles. The non-uniform modification of the fluid energy spectrum by particles has been demonstrated. It is seen that there is an increase in energy at high wave numbers for microparticles (St k
New Approaches In Modeling Multiphase Flows And Dispersion In Turbulence Fractal Methods And Synthetic Turbulence
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Author : F.C.G.A. Nicolleau
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-10-29
New Approaches In Modeling Multiphase Flows And Dispersion In Turbulence Fractal Methods And Synthetic Turbulence written by F.C.G.A. Nicolleau 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 2011-10-29 with Technology & Engineering categories.
This book contains a collection of the main contributions from the first five workshops held by Ercoftac Special Interest Group on Synthetic Turbulence Models (SIG42. It is intended as an illustration of the sig’s activities and of the latest developments in the field. This volume investigates the use of Kinematic Simulation (KS) and other synthetic turbulence models for the particular application to environmental flows. This volume offers the best syntheses on the research status in KS, which is widely used in various domains, including Lagrangian aspects in turbulence mixing/stirring, particle dispersion/clustering, and last but not least, aeroacoustics. Flow realizations with complete spatial, and sometime spatio-temporal, dependency, are generated via superposition of random modes (mostly spatial, and sometime spatial and temporal, Fourier modes), with prescribed constraints such as: strict incompressibility (divergence-free velocity field at each point), high Reynolds energy spectrum. Recent improvements consisted in incorporating linear dynamics, for instance in rotating and/or stably-stratified flows, with possible easy generalization to MHD flows, and perhaps to plasmas. KS for channel flows have also been validated. However, the absence of "sweeping effects" in present conventional KS versions is identified as a major drawback in very different applications: inertial particle clustering as well as in aeroacoustics. Nevertheless, this issue was addressed in some reference papers, and merits to be revisited in the light of new studies in progress.
Numerical Experiments In Homogeneous Turbulence
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Author : Robert Sugden Rogallo
language : en
Publisher:
Release Date : 1981
Numerical Experiments In Homogeneous Turbulence written by Robert Sugden Rogallo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Turbulence categories.
Analysis And Modelling Of Induced Turbulence In Two Phase Flows
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Author : Alessio Innocenti
language : en
Publisher:
Release Date : 2018
Analysis And Modelling Of Induced Turbulence In Two Phase Flows written by Alessio Innocenti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
The present thesis deals with the study and modeling of turbulent two-phase flows and in particular with the mechanisms of turbulence production by a dispersed phase. The objective is to propose reduced models for practical applications and to understand the underlying physics thanks to direct numerical simulations (DNS). The first part covers gas-solid particles flows with a Eulerian (for the fluid) - Lagrangian (for particles) approach. We have proposed a stochastic model for tracking particles in a turbulent Large-Eddy velocity field (LES) in dilute flows, with results very close to DNS. When the mass fraction of the particle phase is significant (dense flows) the effect of the particles on the fluid is accounted for with a two-way coupled stochastic model for the particles, which considers also particle collisions, in a Reynolds-Average equations context (RANS). This model has been tested and validated in different homogeneous and non-homogeneous cases, and in a Cluster Induced Turbulence configuration. The second part focuses on the study of the upward motion of bubbles in a liquid. The numerical code (Basilisk) that we have used has been validated with periodic configurations against different literature studies. We have then investigated several technical problems, like the criteria for the local refinement of the adaptive mesh and the density ratio of the two fluids. Finally, we have studied a bubble column configuration in two and three dimensions, analyzing the spectra and PDFs to describe the fluctuations induced by the bubbles in the liquid.
Turbulence In Fluids
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Author : Marcel Lesieur
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-03-26
Turbulence In Fluids written by Marcel Lesieur 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 2008-03-26 with Technology & Engineering categories.
Now in its fully updated fourth edition, this leading text in its field is an exhaustive monograph on turbulence in fluids in its theoretical and applied aspects. The authors examine a number of advanced developments using mathematical spectral methods, direct-numerical simulations, and large-eddy simulations. The book remains a hugely important contribution to the literature on a topic of great importance for engineering and environmental applications, and presents a very detailed presentation of the field.
Turbulent Flows
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Author : G. Biswas
language : en
Publisher: CRC Press
Release Date : 2002
Turbulent Flows written by G. Biswas and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Technology & Engineering categories.
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.
Turbulent Flows
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Author : Stephen B. Pope
language : en
Publisher: Cambridge University Press
Release Date : 2000-08-10
Turbulent Flows written by Stephen B. Pope 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 2000-08-10 with Science categories.
This is a graduate text on turbulent flows, an important topic in fluid dynamics. It is up-to-date, comprehensive, designed for teaching, and is based on a course taught by the author at Cornell University for a number of years. The book consists of two parts followed by a number of appendices. Part I provides a general introduction to turbulent flows, how they behave, how they can be described quantitatively, and the fundamental physical processes involved. Part II is concerned with different approaches for modelling or simulating turbulent flows. The necessary mathematical techniques are presented in the appendices. This book is primarily intended as a graduate level text in turbulent flows for engineering students, but it may also be valuable to students in applied mathematics, physics, oceanography and atmospheric sciences, as well as researchers and practising engineers.
Statistical Theory And Modeling For Turbulent Flows
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Author : P. A. Durbin
language : en
Publisher: John Wiley & Sons
Release Date : 2011-06-28
Statistical Theory And Modeling For Turbulent Flows written by P. A. Durbin and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-28 with Science categories.
Providing a comprehensive grounding in the subject of turbulence, Statistical Theory and Modeling for Turbulent Flows develops both the physical insight and the mathematical framework needed to understand turbulent flow. Its scope enables the reader to become a knowledgeable user of turbulence models; it develops analytical tools for developers of predictive tools. Thoroughly revised and updated, this second edition includes a new fourth section covering DNS (direct numerical simulation), LES (large eddy simulation), DES (detached eddy simulation) and numerical aspects of eddy resolving simulation. In addition to its role as a guide for students, Statistical Theory and Modeling for Turbulent Flows also is a valuable reference for practicing engineers and scientists in computational and experimental fluid dynamics, who would like to broaden their understanding of fundamental issues in turbulence and how they relate to turbulence model implementation. Provides an excellent foundation to the fundamental theoretical concepts in turbulence. Features new and heavily revised material, including an entire new section on eddy resolving simulation. Includes new material on modeling laminar to turbulent transition. Written for students and practitioners in aeronautical and mechanical engineering, applied mathematics and the physical sciences. Accompanied by a website housing solutions to the problems within the book.
Turbulence Generation In Homogeneous Dilute Particle Laden Flows
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Author : Jeng-Horng Chen
language : en
Publisher:
Release Date : 1999
Turbulence Generation In Homogeneous Dilute Particle Laden Flows written by Jeng-Horng Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
