On The Predictability Of Turbulent Mixing With Implicit Large Eddy Simulation PDF Download
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Author | : Adam Joseph Wachtor |
Publisher | : |
Total Pages | : 127 |
Release | : 2012 |
Genre | : |
ISBN | : 9781267657275 |
Download On the Predictability of Turbulent Mixing with Implicit Large-eddy Simulation Book in PDF, ePub and Kindle
Under resolved computer simulations are typically unavoidable in many practical turbulent flow applications exhibiting extreme geometrical complexity and broad ranges of length and time scales. In such applications, coarse grained simulation becomes the effective simulation strategy, mostly by necessity rather than by choice. In coarse grained simulation strategies, resolved/unresolved scale separation is assumed possible, large energy containing structures are mostly resolved, smaller structures are spatially filtered out, and unresolved subgrid effects are modeled. The subject of this work is on implicit large-eddy simulation which relies on subgrid modeling implicitly provided by physics capturing numerical algorithms. Predictability issues of coarse grained simulation from the perspective of implicit large-eddy simulation of under resolved mixing of material scalars driven by under resolved velocity fields and initial conditions are addressed. The performance of implicit large-eddy simulation in the contexts of forced scalar mixing, transition to turbulence and turbulence decay, and shock-driven turbulent mixing is the particular focus.
Author | : Fenando F. Grinstein |
Publisher | : Cambridge University Press |
Total Pages | : 481 |
Release | : 2016-06-30 |
Genre | : Science |
ISBN | : 1107137047 |
Download Coarse Grained Simulation and Turbulent Mixing Book in PDF, ePub and Kindle
Reviews our current understanding of the subject. For graduate students and researchers in computational fluid dynamics and turbulence.
Author | : Fernando F. Grinstein |
Publisher | : Cambridge University Press |
Total Pages | : 0 |
Release | : 2011-02-17 |
Genre | : Technology & Engineering |
ISBN | : 9780521172721 |
Download Implicit Large Eddy Simulation Book in PDF, ePub and Kindle
The numerical simulation of turbulent flows is a subject of great practical importance to scientists and engineers. The difficulty in achieving predictive simulations is perhaps best illustrated by the wide range of approaches that have been developed and are still being used by the turbulence modeling community. In this book the authors describe one of these approaches, Implicit Large Eddy Simulation (ILES). ILES is a relatively new approach that combines generality and computational efficiency with documented success in many areas of complex fluid flow. This book synthesizes the theoretical basis of the ILES methodology and reviews its accomplishments. ILES pioneers and lead researchers combine here their experience to present a comprehensive description of the methodology. This book should be of fundamental interest to graduate students, basic research scientists, as well as professionals involved in the design and analysis of complex turbulent flows.
Author | : Rider William Margolin Len G Grinstein Fenando F |
Publisher | : |
Total Pages | : 578 |
Release | : 2014-05-14 |
Genre | : Science |
ISBN | : 9780511649004 |
Download Implicit Large Eddy Simulation Book in PDF, ePub and Kindle
Author | : Fernando F. Grinstein |
Publisher | : Cambridge University Press |
Total Pages | : 481 |
Release | : 2016-06-30 |
Genre | : Technology & Engineering |
ISBN | : 1316571742 |
Download Coarse Grained Simulation and Turbulent Mixing Book in PDF, ePub and Kindle
Small-scale turbulent flow dynamics is traditionally viewed as universal and as enslaved to that of larger scales. In coarse grained simulation (CGS), large energy-containing structures are resolved, smaller structures are spatially filtered out, and unresolved subgrid scale (SGS) effects are modeled. Coarse Grained Simulation and Turbulent Mixing reviews our understanding of CGS. Beginning with an introduction to the fundamental theory the discussion then moves to the crucial challenges of predictability. Next, it addresses verification and validation, the primary means of assessing accuracy and reliability of numerical simulation. The final part reports on the progress made in addressing difficult non-equilibrium applications of timely current interest involving variable density turbulent mixing. The book will be of fundamental interest to graduate students, research scientists, and professionals involved in the design and analysis of complex turbulent flows.
Author | : Yōsuke Shimada |
Publisher | : |
Total Pages | : |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Computational Science of Turbulent Mixing and Combustion Book in PDF, ePub and Kindle
Implicit Large Eddy Simulation (ILES) with high-resolution and high-order computationalmodelling has been applied to flows with turbulent mixing and combustion. Due to the turbulent nature, mixing of fuel and air and the subsequent combustionstill remain challenging for computational fluid dynamics. However, recently ILES, anadvanced numerical approach in Large Eddy Simulation methods, has shown encouragingresults in prediction of turbulent flows. In this thesis the governing equationsfor single phase compressible flow were solved with an ILES approach using a finitevolume Godunov-type method without explicit modelling of the subgrid scales. Up toninth-order limiters were used to achieve high order spatial accuracy. When simulating non chemical reactive flows, the mean flow of a fuel burner was comparedwith the experimental results and showed good agreement in regions of strongturbulence and recirculation. The one dimensional kinetic energy spectrum was alsoexamined and an ideal k?5/3decay of energy could be seen in a certain range, whichincreased with grid resolution and order of the limiter. The cut-off wavenumbers arelarger than the estimated maximum wavenumbers on the grid, therefore, the numericaldissipation sufficiently accounted for the energy transportation between large andsmall eddies. The effect of density differences between fuel and air was investigatedfor a wide range of Atwood number. The mean flow showed that when fuel momentumfluxes are identical the flow structure and the velocity fields were unchanged byAtwood number except for near fuel jet regions. The results also show that the effectsof Atwood number on the flow structure can be described with a mixing parameter. In combustion flows simulation, a non filtered Arrhenius model was applied for thechemical source term, which corresponds to the case of the large chemical time scalecompared to the turbulent time scale. A methane and air shear flow simulation wasperformed and the methane reaction rate showed non zero values against all temperatureranges. Small reaction rates were observed in the low temperature range due tothe lack of subgrid scale modelling of the chemical source term. Simulation was alsoperformed with fast chemistry approach representing the case of the large turbulenttime scale compared to the chemical time scale. The mean flow of burner flames werecompared with experimental data and a fair agreement was observed.
Author | : Eric Garnier |
Publisher | : Springer Science & Business Media |
Total Pages | : 280 |
Release | : 2009-08-11 |
Genre | : Science |
ISBN | : 9048128196 |
Download Large Eddy Simulation for Compressible Flows Book in PDF, ePub and Kindle
This book addresses both the fundamentals and the practical industrial applications of Large Eddy Simulation (LES) in order to bridge the gap between LES research and the growing need to use it in engineering modeling.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2002 |
Genre | : |
ISBN | : |
Download Implicit Large Eddy Simulation for Unsteady Multi-component Compressible Turbulent Flows Book in PDF, ePub and Kindle
Numerical methods for the simulation of shock-induced turbulent mixing have been investigated, focussing on Implicit Large Eddy Simulation. Shock-induced turbulent mixing is of particular importance for many astrophysical phenomena, inertial confinement fusion, and mixing in supersonic combustion. These disciplines are particularly reliant on numerical simulation, as the extreme nature of the flow in question makes gathering accurate experimental data difficult or impossible. A detailed quantitative study of homogeneous decaying turbulence demonstrates that existing state of the art methods represent the growth of turbulent structures and the decay of turbulent kinetic energy to a reasonable degree of accuracy. However, a key observation is that the numerical methods are too dissipative at high wavenumbers (short wavelengths relative to the grid spacing). A theoretical analysis of the dissipation of kinetic energy in low Mach number flows shows that the leading order dissipation rate for Godunov-type schemes is proportional to the speed of sound and the velocity jump across the cell interface squared. This shows that the dissipation of Godunov-type schemes becomes large for low Mach flow features, hence impeding the development of fluid instabilities, and causing overly dissipative turbulent kinetic energy spectra. It is shown that this leading order term can be removed by locally modifying the reconstruction of the velocity components. As the modification is local, it allows the accurate simulation of mixed compressible/incompressible flows without changing the formulation of the governing equations. In principle, the modification is applicable to any finite volume compressible method which includes a reconstruction stage. Extensive numerical tests show great improvements in performance at low Mach compared to the standard scheme, significantly improving turbulent kinetic energy spectra, and giving the correct Mach squared scaling of pressure and density variations.
Author | : P. Sagaut |
Publisher | : Springer Science & Business Media |
Total Pages | : 600 |
Release | : 2006 |
Genre | : Computers |
ISBN | : 9783540263449 |
Download Large Eddy Simulation for Incompressible Flows Book in PDF, ePub and Kindle
First concise textbook on Large-Eddy Simulation, a very important method in scientific computing and engineering From the foreword to the third edition written by Charles Meneveau: "... this meticulously assembled and significantly enlarged description of the many aspects of LES will be a most welcome addition to the bookshelves of scientists and engineers in fluid mechanics, LES practitioners, and students of turbulence in general."
Author | : Bernard J. Geurts |
Publisher | : Walter de Gruyter GmbH & Co KG |
Total Pages | : 320 |
Release | : 2022-12-05 |
Genre | : Mathematics |
ISBN | : 3110532360 |
Download Direct and Large-Eddy Simulation Book in PDF, ePub and Kindle
This book presents a comprehensive overview of the mathematics and physics behind the simulation of turbulent flows and discusses in detail (i) the phenomenology of turbulence in fluid dynamics, (ii) the role of direct and large-eddy simulation in predicting these dynamics, (iii) the multiple considerations underpinning subgrid modelling, and, (iv) the issue of validation and reliability resulting from interacting modelling and numerical errors.