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Author :
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (227 download)
Download or read book Implicit Large Eddy Simulation for Unsteady Turbulent Flows written by and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : B. Thornber
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (11 download)
Download or read book Implicit Large Eddy Simulation for Unsteady Multi-component Compressible Turbulent Flows written by B. Thornber and published by . This book was released on 2007 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Fernando F. Grinstein
Publisher : Cambridge University Press
ISBN 13 : 9780521869829
Total Pages : 578 pages
Book Rating : 4.8/5 (698 download)
Download or read book Implicit Large Eddy Simulation written by Fernando F. Grinstein and published by Cambridge University Press. This book was released on 2007-07-30 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Implicit Large Eddy Simulation for Unsteady Multi-component Compressible Turbulent Flows written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Eric Garnier
Publisher : Springer Science & Business Media
ISBN 13 : 9048128196
Total Pages : 280 pages
Book Rating : 4.0/5 (481 download)
Download or read book Large Eddy Simulation for Compressible Flows written by Eric Garnier and published by Springer Science & Business Media. This book was released on 2009-08-11 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Johan Meyers
Publisher : Springer Science & Business Media
ISBN 13 : 1402085788
Total Pages : 390 pages
Book Rating : 4.4/5 (2 download)
Download or read book Quality and Reliability of Large-Eddy Simulations written by Johan Meyers and published by Springer Science & Business Media. This book was released on 2008-06-26 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational resources have developed to the level that, for the first time, it is becoming possible to apply large-eddy simulation (LES) to turbulent flow problems of realistic complexity. Many examples can be found in technology and in a variety of natural flows. This puts issues related to assessing, assuring, and predicting the quality of LES into the spotlight. Several LES studies have been published in the past, demonstrating a high level of accuracy with which turbulent flow predictions can be attained, without having to resort to the excessive requirements on computational resources imposed by direct numerical simulations. However, the setup and use of turbulent flow simulations requires a profound knowledge of fluid mechanics, numerical techniques, and the application under consideration. The susceptibility of large-eddy simulations to errors in modelling, in numerics, and in the treatment of boundary conditions, can be quite large due to nonlinear accumulation of different contributions over time, leading to an intricate and unpredictable situation. A full understanding of the interacting error dynamics in large-eddy simulations is still lacking. To ensure the reliability of large-eddy simulations for a wide range of industrial users, the development of clear standards for the evaluation, prediction, and control of simulation errors in LES is summoned. The workshop on Quality and Reliability of Large-Eddy Simulations, held October 22-24, 2007 in Leuven, Belgium (QLES2007), provided one of the first platforms specifically addressing these aspects of LES.
Author : Rider William Margolin Len G Grinstein Fenando F
Publisher :
ISBN 13 : 9780511649004
Total Pages : 578 pages
Book Rating : 4.6/5 (49 download)
Download or read book Implicit Large Eddy Simulation written by Rider William Margolin Len G Grinstein Fenando F and published by . This book was released on 2014-05-14 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Maria Vittoria Salvetti
Publisher : Springer
ISBN 13 : 3030049159
Total Pages : 608 pages
Book Rating : 4.0/5 (3 download)
Download or read book Direct and Large-Eddy Simulation XI written by Maria Vittoria Salvetti and published by Springer. This book was released on 2019-02-02 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the 11th workshop on Direct and Large Eddy Simulation (DLES), which was held in Pisa, Italy in May 2017. The event focused on modern techniques for simulating turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structures, as Direct Numerical Simulation (DNS), Large-Eddy Simulation (LES) or hybrid models based on a combination of LES and RANS approaches. In light of the growing capacities of modern computers, these approaches have been gaining more and more interest over the years and will undoubtedly be developed and applied further. The workshop offered a unique opportunity to establish a state-of-the-art of DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows and to discuss about recent advances and applications. This volume contains most of the contributed papers, which were submitted and further reviewed for publication. They cover advances in computational techniques, SGS modeling, boundary conditions, post-processing and data analysis, and applications in several fields, namely multiphase and reactive flows, convection and heat transfer, compressible flows, aerodynamics of airfoils and wings, bluff-body and separated flows, internal flows and wall turbulence and other complex flows.
Author : Trong T. Bui
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (317 download)
Download or read book A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows written by Trong T. Bui and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Luigi Carlo Berselli
Publisher : Springer Science & Business Media
ISBN 13 : 9783540263166
Total Pages : 378 pages
Book Rating : 4.2/5 (631 download)
Download or read book Mathematics of Large Eddy Simulation of Turbulent Flows written by Luigi Carlo Berselli and published by Springer Science & Business Media. This book was released on 2006 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: The LES-method is rapidly developing in many practical applications in engineering The mathematical background is presented here for the first time in book form by one of the leaders in the field
Author : Bernard J. Geurts
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110532360
Total Pages : 320 pages
Book Rating : 4.1/5 (15 download)
Download or read book Direct and Large-Eddy Simulation written by Bernard J. Geurts and published by Walter de Gruyter GmbH & Co KG. This book was released on 2022-12-05 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Brian Vermeire
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (911 download)
Download or read book Adaptive Implicit-explicit Time Integration and High-order Unstructured Methods for Implicit Large Eddy Simulation written by Brian Vermeire and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The aerospace industry relies on accurate numerical simulations of turbulent flows. This requires a numerical method that is accurate and able to handle complex geometries. High-order finite-difference schemes are structured, making mesh generation a time consuming process. High-order finite-volume schemes require large complicated stencils, making them unsuitable for massively parallel simulations.We propose the high-order unstructured correction procedure via reconstruction scheme (CPR) for the simulation of turbulent flows. It has a compact stencil extending to only one neighbouring element, unlike high-order finite-volume schemes. It has a nodal differential form and is quadrature free, unlike other high-order discontinuous schemes. We investigate its application to large eddy simulation (LES), which has greater fidelity than Reynolds-averaged Navier-Stokes models at a fraction of the cost of direct numerical simulation. We propose an implicit LES (ILES) approach, using numerical dissipation to dissipate energy from the smallest resolved scales.We investigate the use of the CPR scheme for ILES of turbulent decaying flows. Primarily the Taylor-Green vortex and Comte-Bellot and Corrsin test cases. We then consider turbulent wall bounded flows including turbulent channel flow and turbulent flow over an SD7003 airfoil. Results show that the CPR scheme can be used for ILES without an explicit subgrid-scale model. We find that the higher-order schemes are more accurate than lower-order schemes on a per degree of freedom basis.We find high-order schemes require an increased amount of memory for fully implicit time-stepping. We propose an adaptive implicit-explicit (IMEX) method to reduce total memory consumption. This allows us to solve a fraction of the domain implicitly, where it is required for the sake of stability. Results show that the proposed scheme is stable and maintains the formal order of accuracy of the spatial discretization. Simulations of unsteady and turbulent flows show that this approach can be used for ILES. The proposed scheme provides two orders of magnitude reduction in simulation time for turbulent flow over a circular cylinder, while consuming only a fraction of the memory required for a fully implicit scheme." --
Author : Mohsen Hamedi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)
Download or read book Stabilizing Filters for High-Order Implicit Large Eddy Simulation written by Mohsen Hamedi and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-order Flux Reconstruction (FR) schemes can simulate unsteady turbulent flows using Large Eddy Simulation (LES) and Direct Numerical Simulation (DNS) in the vicinity of complex geometries. The application of FR schemes can be limited by non-linear instabilities, related to oscillatory behaviour of the element-wise numerical solution, causing nonphysical solutions. In this study, filtering is studied for hexagonal element types and solution polynomial of degrees 3, 4, and 5 at different Mach numbers ranging from 0.1 to 0.5. A new exponential filtering function is applied globally to all elements and artificially damps high-frequency oscillations to improve numerical stability. Numerous numerical tests have been performed to investigate different parameters in the exponential filtering function. The optimum set of these parameters is obtained such that the highest solution polynomial modes are damped while the lower ones remain untouched to preserve accuracy. The solution polynomial is filtered after each time step; however, the filtering operator is defined, through the concept of characteristic time, to be independent of the time-step size. The exponential filter has been implemented and rigorously studied to evaluate its accuracy. To verify the order of accuracy, advection of an isentropic vortex has been analyzed. To study accuracy for LES, the Taylor-Green vortex test case is studied as a free turbulent flow. Finally, a previously unstable wall-bounded turbulent channel flow test case along with a NACA0020 airfoil at high angle of attack are considered to study the effects of the proposed filtering on stability and accuracy of practical applications.
Author : M. Lesieur
Publisher : Cambridge University Press
ISBN 13 : 9780521781244
Total Pages : 240 pages
Book Rating : 4.7/5 (812 download)
Download or read book Large-Eddy Simulations of Turbulence written by M. Lesieur and published by Cambridge University Press. This book was released on 2005-08-22 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-Eddy Simulations of Turbulence is a reference for LES, direct numerical simulation and Reynolds-averaged Navier-Stokes simulation.
Author : Bernard Geurts
Publisher : R.T. Edwards, Inc.
ISBN 13 : 9781930217072
Total Pages : 0 pages
Book Rating : 4.2/5 (17 download)
Download or read book Elements of Direct and Large-eddy Simulation written by Bernard Geurts and published by R.T. Edwards, Inc.. This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geurts (U. of Twente) explains direct and large-eddy simulations of turbulent flow, focusing on how to capture the primary features of unsteady flow through computation rather than on a complete statistical modeling. The approach incorporates elements of numerical and mathematical-physical modeling.
Author : Cristian Marchioli
Publisher : Springer Nature
ISBN 13 : 3031470281
Total Pages : 389 pages
Book Rating : 4.0/5 (314 download)
Download or read book Direct and Large Eddy Simulation XIII written by Cristian Marchioli and published by Springer Nature. This book was released on 2023-11-15 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the diverse and cutting-edge research presented at the 13th ERCOFTAC Workshop on Direct and Large Eddy Simulation. The first section of the book focuses on Aerodynamics/Aeroacoustics, comprising eight papers that delve into the intricate relationship between fluid flow and aerodynamic performance. The second section explores the dynamics of Bluff/Moving Bodies through four insightful papers. Bubbly Flows, the subject of the third section, is examined through four papers. Moving on, the fourth section is dedicated to Combustion and Reactive Flows, presenting two papers that focus on the complex dynamics of combustion processes and the interactions between fluids and reactive species. Convection and Heat/Mass Transfer are the central themes of the fifth section, which includes three papers. These contributions explore the fundamental aspects of heat and mass transfer in fluid flows, addressing topics such as convective heat transfer, natural convection, and mass transport phenomena. The sixth section covers Data Assimilation and Uncertainty Quantification, featuring two papers that highlight the importance of incorporating data into fluid dynamic models and quantifying uncertainties associated with these models. The subsequent sections encompass a wide range of topics, including Environmental and Industrial Applications, Flow Separation, LES Fundamentals and Modelling, Multiphase Flows, and Numerics and Methodology. These sections collectively present a total of 23 papers that explore different facets of fluid dynamics, contributing to the advancement of the field and its practical applications.
Author : Manuel García-Villalba
Publisher : Springer Nature
ISBN 13 : 3030428222
Total Pages : 478 pages
Book Rating : 4.0/5 (34 download)
Download or read book Direct and Large Eddy Simulation XII written by Manuel García-Villalba and published by Springer Nature. This book was released on 2020-05-09 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the 12th instalment in the bi-annual Workshop series on Direct and Large Eddy Simulation (DLES), which began in 1994 and focuses on modern techniques used to simulate turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structure. With the rapidly expanding capacities of modern computers, this approach has attracted more and more interest over the years and will undoubtedly be further enhanced and applied in the future. Hybrid modelling techniques based on a combination of LES and RANS approaches also fall into this category and are covered as well. The goal of the Workshop was to share the state of the art in DNS, LES and related techniques for the computation and modelling of turbulent and transitional flows. The respective papers highlight the latest advances in the prediction, understanding and control of turbulent flows in academic and industrial applications.
