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Author: Dirk Großschmidt
Publisher:
ISBN: 9783183555062
Category : Combustion
Languages : en
Pages : 163
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Author: Dirk Großschmidt
Publisher:
ISBN: 9783183555062
Category : Combustion
Languages : en
Pages : 163
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Book Description
Author: Santanu De
Publisher: Springer
ISBN: 9811074100
Category : Science
Languages : en
Pages : 663
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Book Description
This book presents a comprehensive review of state-of-the-art models for turbulent combustion, with special emphasis on the theory, development and applications of combustion models in practical combustion systems. It simplifies the complex multi-scale and nonlinear interaction between chemistry and turbulence to allow a broader audience to understand the modeling and numerical simulations of turbulent combustion, which remains at the forefront of research due to its industrial relevance. Further, the book provides a holistic view by covering a diverse range of basic and advanced topics—from the fundamentals of turbulence–chemistry interactions, role of high-performance computing in combustion simulations, and optimization and reduction techniques for chemical kinetics, to state-of-the-art modeling strategies for turbulent premixed and nonpremixed combustion and their applications in engineering contexts.
Author: Sudip Adhikari
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 111
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Book Description
Modeling of pollutants such as soot and other byproduct formation inside the practical combustion devices have become an increasingly important research topic over the past couple of decades. However, the accurate prediction of emission requires robust and efficient computational methods for modeling of turbulent reacting flows. One of the most computationally efficient modeling approaches is a combination of a Reynolds-averaged Navier Stokes (RANS) approach and eddy dissipation concept (EDC), where the former addresses the flow turbulence, while the latter accounts for the turbulence-chemistry interactions. EDC includes a fine structure of turbulence known as perfectly stirred reactors (PSRs). A PSR model based on the hybrid Newton/time integration methodology is developed and coupled to two state-of-the-art soot moment techniques, namely the method of moments with interpolative closure (MOMIC) and the hybrid method of moments (HMOM), with the latter coupling being implemented for the first time, for investigating soot formation and growth.The PSR algorithm employs a procedure of switching between steady-state and pseudo-transient calculations of the nonlinear algebraic steady PSR equations in order to achieve a more conditioned estimate of the initial guess. Soot moment equations are coupled with species conservation equations to obtain soot quantities such as soot volume fraction, particle number density, particle diameter and soot surface area density. The PSR algorithm based on hybrid Newton/time integration approach is extended and implemented in the context of two-dimensional (2D) eddy dissipation concept (EDC) simulations of turbulent flames. Furthermore, an efficient computational implementation of in situ adaptive tabulation (ISAT) approach for combustion chemistry in a network of perfectly stirred reactors (PSRs) is also presented, and the developed implementation is extended in two different contexts; for the EDC calculations of 2D turbulent flames, and for the acceleration of computation of soot formation and growth in a network of perfectly stirred reactors (PSRs). A step by step procedure is developed for the calculation of reaction mapping gradient matrix needed for ISAT calculations in the context of PSRs. A series of PSR calculations is carried out using the direct integration (DI) and ISAT approaches. Validation of DI is performed through comparisons with previous experiments. In addition, results from different test cases are presented and the speedup of ISAT over Direct Integration (DI) is also calculated. Finally, a highly parallelized GPU implementation is presented for a batched calculation of PSR model, using a robust and efficient non-linear solver for gas phase chemical reactions and is further coupled to one of the widely used moment methods of solutions of soot equations, the Method of Moment with Interpolative Closure (MOMIC).
Author: Tarek Echekki
Publisher: Springer Science & Business Media
ISBN: 9400704127
Category : Technology & Engineering
Languages : en
Pages : 496
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Book Description
Turbulent combustion sits at the interface of two important nonlinear, multiscale phenomena: chemistry and turbulence. Its study is extremely timely in view of the need to develop new combustion technologies in order to address challenges associated with climate change, energy source uncertainty, and air pollution. Despite the fact that modeling of turbulent combustion is a subject that has been researched for a number of years, its complexity implies that key issues are still eluding, and a theoretical description that is accurate enough to make turbulent combustion models rigorous and quantitative for industrial use is still lacking. In this book, prominent experts review most of the available approaches in modeling turbulent combustion, with particular focus on the exploding increase in computational resources that has allowed the simulation of increasingly detailed phenomena. The relevant algorithms are presented, the theoretical methods are explained, and various application examples are given. The book is intended for a relatively broad audience, including seasoned researchers and graduate students in engineering, applied mathematics and computational science, engine designers and computational fluid dynamics (CFD) practitioners, scientists at funding agencies, and anyone wishing to understand the state-of-the-art and the future directions of this scientifically challenging and practically important field.
Author: Manuel D. Salas
Publisher: Springer Science & Business Media
ISBN: 9401147248
Category : Science
Languages : en
Pages : 385
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Book Description
Turbulence modeling both addresses a fundamental problem in physics, 'the last great unsolved problem of classical physics,' and has far-reaching importance in the solution of difficult practical problems from aeronautical engineering to dynamic meteorology. However, the growth of supercom puter facilities has recently caused an apparent shift in the focus of tur bulence research from modeling to direct numerical simulation (DNS) and large eddy simulation (LES). This shift in emphasis comes at a time when claims are being made in the world around us that scientific analysis itself will shortly be transformed or replaced by a more powerful 'paradigm' based on massive computations and sophisticated visualization. Although this viewpoint has not lacked ar ticulate and influential advocates, these claims can at best only be judged premature. After all, as one computational researcher lamented, 'the com puter only does what I tell it to do, and not what I want it to do. ' In turbulence research, the initial speculation that computational meth ods would replace not only model-based computations but even experimen tal measurements, have not come close to fulfillment. It is becoming clear that computational methods and model development are equal partners in turbulence research: DNS and LES remain valuable tools for suggesting and validating models, while turbulence models continue to be the preferred tool for practical computations. We believed that a symposium which would reaffirm the practical and scientific importance of turbulence modeling was both necessary and timely.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 780
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Book Description
Author: H. Calcote
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
Development of a thermochemical data base containing seventy cations of possible importance in soot formation was completed. The results were generalized for the estimation of the Gibbs energies of cations not included in the data base. The chemical kinetic model was expanded to include the chemiionization step by adding concentration profiles of O atoms and electronically excite CH as inputs to the program. The computer code was modified to include the chemiionization step, electron attachment and cation-anion recombination. Under some conditions the computer model and experiment were in excellent agreement, but questions remained. Analysis performed in this project indicated that gas sample cooling by the mass spectrometer sampling cone could have, for some cations, caused reactions to occur so that the mass analysis indicated a different ion from that in the flame. Calculations showed that energy liberated in rapid ion-molecule reactions accumulates in the product cation complicating the reaction kinetics. A survey of published flame measurements found that only ions dramatically change at soot threshold, but no explanation for this change was identified. The possible importance of choosing a neutral or ionic mechanism on the results of modeling soot formation in turbulent flow was considered.
Author: Efstathios Michaelides
Publisher: CRC Press
ISBN: 1315354624
Category : Science
Languages : en
Pages : 1559
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Book Description
The Multiphase Flow Handbook, Second Edition is a thoroughly updated and reorganized revision of the late Clayton Crowe’s work, and provides a detailed look at the basic concepts and the wide range of applications in this important area of thermal/fluids engineering. Revised by the new editors, Efstathios E. (Stathis) Michaelides and John D. Schwarzkopf, the new Second Edition begins with two chapters covering fundamental concepts and methods that pertain to all the types and applications of multiphase flow. The remaining chapters cover the applications and engineering systems that are relevant to all the types of multiphase flow and heat transfer. The twenty-one chapters and several sections of the book include the basic science as well as the contemporary engineering and technological applications of multiphase flow in a comprehensive way that is easy to follow and be understood. The editors created a common set of nomenclature that is used throughout the book, allowing readers to easily compare fundamental theory with currently developing concepts and applications. With contributed chapters from sixty-two leading experts around the world, the Multiphase Flow Handbook, Second Edition is an essential reference for all researchers, academics and engineers working with complex thermal and fluid systems.
Author: F.C.G.A. Nicolleau
Publisher: Springer Science & Business Media
ISBN: 940072506X
Category : Technology & Engineering
Languages : en
Pages : 159
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 928
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Book Description
