modeling and simulation of reactive flows

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Modeling And Simulation Of Reactive Flows

Author : A.L. De Bortoli
ISBN : 9780128029916
Genre : Technology & Engineering
File Size : 72. 81 MB
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Modelling and Simulation of Reactive Flows presents information on modeling and how to numerically solve reactive flows. The book offers a distinctive approach that combines diffusion flames and geochemical flow problems, providing users with a comprehensive resource that bridges the gap for scientists, engineers, and the industry. Specifically, the book looks at the basic concepts related to reaction rates, chemical kinetics, and the development of reduced kinetic mechanisms. It considers the most common methods used in practical situations, along with equations for reactive flows, and various techniques—including flamelet, ILDM, and Redim—for jet flames and plumes, with solutions for both. In addition, the book includes techniques to accelerate the convergence of numerical simulation, and a discussion on the analysis of uncertainties with numerical results, making this a useful reference for anyone who is interested in both combustion in free flow and in porous media. Helps readers learn how to apply applications of numerical methods to simulate geochemical kinetics Presents methods on how to transform the transport equations in several coordinate systems Includes discussions of the basic concepts related to reaction rates, chemical kinetics, and the development of reduced kinetic mechanisms, including the most common methods used in practical situations Offers a distinctive approach that combines diffusion flames and geochemical flow problems

Numerical Simulation Of Reactive Flow

Author : Elaine S. Oran
ISBN : 0521022363
Genre : Science
File Size : 39. 41 MB
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Reactive flows encompass a broad range of physical phenomena, interacting over many different time and space scales. Such flows occur in combustion, chemical lasers, the earth's oceans and atmosphere, and stars and interstellar space. Despite the obvious physical differences in these flows, there is a striking similarity in the forms of their descriptive equations. Thus, the considerations and procedures for constructing numerical models of these systems are also similar, and these similarities can be exploited. Moreover, using the latest technology, what were once difficult and expensive computations can now be done on desktop computers. This book takes account of the explosive growth in computer technology and the greatly increased capacity for solving complex reactive flow problems that have occurred since the first edition of Numerical Simulation of Reactive Flow was published in 1987. It presents algorithms useful for reactive flow simulations, describes trade-offs involved in their use, and gives guidance for building and using models of complex reactive flows.

Numerical Simulation Of Reactive Flow In Hot Aquifers

Author : Christoph Clauser
ISBN : 9783642556845
Genre : Science
File Size : 35. 72 MB
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Modeling And Simulation Of Thermal Ignition Flame Fronts Reactive Flows And Transonic Combustion

Author : William E. Tavernetti
ISBN : 1321610017
Genre :
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Nonlinear dynamical phenomena in combustion processes is an active area of experimental and theoretical research. This is in large part due to increasingly strict environmental pressures to make gas turbine engines and industrial burners more efficient. For prospects as a field of study, the problem is a highly diverse subset of applied mechanics which appeals to a wide variety of investigators in engineering, applied sciences, mathematics and even, for example, in life sciences applications, such as biochemistry. This dissertation studies several interrelated problems with a focus on modeling implications in this complicated nonlinear framework. The main topics are (1) numerical solutions of reaction-diffusion equations of the thermal ignition problem and flame front models, (2) reactive axisymmetric swirling viscous flow leading to enhanced mixing with vortex breakdown, and (3) transonic and supersonic reactive inviscid flows with shocks. Results, details of the numerical algorithms, as well as numerical verification techniques and validation with sources from the literature will be presented. With respect to the thermal ignition theory, issues related to bifurcations, oscillations and chaotic dynamics are considered. Numerical treatment of the thermal ignition problem when the Lewis number is not equal to one is also studied, and robust numerical methods for the stiff, nonlinear reaction-diffusion problems are implemented. Solutions which can be used coupled to fluid flow in an axisymmetric geometry are also considered. Some approaches in flame theory and their dynamical properties, as well as numerical and physical extensions are examined. For reactive axisymmetric swirling flow, the main study is of flows with vortex breakdown which leads to enhanced mixing. Several incompressible and compressible problems are first studied in a related framework with and without combustion. Incompressible swirling flow in terms of stream function, vorticity, and circulation is considered, along with non-isothermal swirling flow. A model is developed for reactive swirling compressible flow assuming constant pressure. Next, a model is developed for premixed reactive swirling flow via Boussinesq approximation. Finally, a compressible, reactive, swirling flow model is developed for a perfect gas and used to investigate cases with vortex breakdown. With respect to transonic reactive nozzle flows, a small disturbance combustion model is studied first. This small disturbance model is then extended to an unsteady full potential model. An alternate formulation of the Euler Equations that can be used to extend the unsteady reactive potential flow model is considered. In addition, a simple upwind scheme for computation of transonic flows is presented and studied with example problems in one and two dimensions, as well as flows with heat and friction. Finally, detonation theory, including friction, is studied. In the final chapter, future work and extensions for the three parts of the dissertation: solutions of reaction diffusion equations, combustion in low speed (compressible and incompressible) viscous flows with swirling, and combustion in high speed (transonic and supersonic) inviscid flows with shock waves, are discussed.

Bridging Scales In Modelling And Simulation Of Non Reacting And Reacting Flows

Author :
ISBN : 9780128150979
Genre : Technology & Engineering
File Size : 80. 75 MB
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Bridging Scales in Modelling and Simulating Reacting Flows, Part I , Volume 52 presents key methods to bridge scales in the simulation of reacting single phase flows. New sections in the updated release include topics such as quadrature-based moment methods for multiphase chemically reacting flows, the collaboration of experiments and simulations for the development of predictive models, a simulation of turbulent coalescence and breakage of bubbles and droplets in the presence of surfactants, a section on salts and contaminants, and information on the numerical simulation of reactive flows. Contains reviews by leading authorities in their respective areas Presents up-to-date reviews of the latest techniques in the modeling of catalytic processes Includes a broad mix of US and European authors, as well as academic, industrial and research institute perspectives Provides discussions on the connections between computational and experimental methods

Chemically Reacting Flow

Author : Robert J. Kee
ISBN : 9781119186298
Genre : Science
File Size : 55. 31 MB
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A guide to the theoretical underpinnings and practical applications of chemically reacting flow Chemically Reacting Flow: Theory, Modeling, and Simulation, Second Edition combines fundamental concepts in fluid mechanics and physical chemistry while helping students and professionals to develop the analytical and simulation skills needed to solve real-world engineering problems. The authors clearly explain the theoretical and computational building blocks enabling readers to extend the approaches described to related or entirely new applications. New to this Second Edition are substantially revised and reorganized coverage of topics treated in the first edition. New material in the book includes two important areas of active research: reactive porous-media flows and electrochemical kinetics. These topics create bridges between traditional fluid-flow simulation approaches and transport within porous-media electrochemical systems. The first half of the book is devoted to multicomponent fluid-mechanical fundamentals. In the second half the authors provide the necessary fundamental background needed to couple reaction chemistry into complex reacting-flow models. Coverage of such topics is presented in self-contained chapters, allowing a great deal of flexibility in course curriculum design. • Features new chapters on reactive porous-media flow, electrochemistry, chemical thermodynamics, transport properties, and solving differential equations in MATLAB • Provides the theoretical underpinnings and practical applications of chemically reacting flow • Emphasizes fundamentals, allowing the analyst to understand fundamental theory underlying reacting-flow simulations • Helps readers to acquire greater facility in the derivation and solution of conservation equations in new or unusual circumstances • Reorganized to facilitate use as a class text and now including a solutions manual for academic adopters Computer simulation of reactive systems is highly efficient and cost-effective in the development, enhancement, and optimization of chemical processes. Chemically Reacting Flow: Theory, Modeling, and Simulation, Second Edition helps prepare graduate students in mechanical or chemical engineering, as well as research professionals in those fields take utmost advantage of that powerful capability.

Chemical Reactor Modeling

Author : Hugo A. Jakobsen
ISBN : 9783319050928
Genre : Technology & Engineering
File Size : 74. 4 MB
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Chemical Reactor Modeling closes the gap between Chemical Reaction Engineering and Fluid Mechanics. The second edition consists of two volumes: Volume 1: Fundamentals. Volume 2: Chemical Engineering Applications In volume 1 most of the fundamental theory is presented. A few numerical model simulation application examples are given to elucidate the link between theory and applications. In volume 2 the chemical reactor equipment to be modeled are described. Several engineering models are introduced and discussed. A survey of the frequently used numerical methods, algorithms and schemes is provided. A few practical engineering applications of the modeling tools are presented and discussed. The working principles of several experimental techniques employed in order to get data for model validation are outlined. The monograph is based on lectures regularly taught in the fourth and fifth years graduate courses in transport phenomena and chemical reactor modeling and in a post graduate course in modern reactor modeling at the Norwegian University of Science and Technology, Department of Chemical Engineering, Trondheim, Norway. The objective of the book is to present the fundamentals of the single-fluid and multi-fluid models for the analysis of single and multiphase reactive flows in chemical reactors with a chemical reactor engineering rather than mathematical bias. Organized into 13 chapters, it combines theoretical aspects and practical applications and covers some of the recent research in several areas of chemical reactor engineering. This book contains a survey of the modern literature in the field of chemical reactor modeling.

Direct Numerical Simulation For Turbulent Reacting Flows

Author : Thierry Baritaud
ISBN : 2710806983
Genre : Technology & Engineering
File Size : 54. 67 MB
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Contents: Description of accurate boundary conditions for the simulation of reactive flows. Parallel direct numerical simulation of turbulent reactive flow. Flame-wall interaction and heat flux modelling in turbulent channel flow. A numerical study of laminar flame wall interaction with detailed chemistry: wall temperature effects. Modeling and simulation of turbulent flame kernel evolution. Experimental and theoretical analysis of flame surface density modelling for premixed turbulent combustion. Gradient and counter-gradient transport in turbulent premixed flames. Direct numerical simulation of turbulent flames with complex chemical kinetics. Effects of curvature and unsteadiness in diffusion flames. Implications for turbulent diffusion combustion. Numerical simulations of autoignition in turbulent mixing flows. Stabilization processes of diffusion flames. References.

Reactive Flows Diffusion And Transport

Author : Willi Jäger
ISBN : 9783540283966
Genre : Mathematics
File Size : 36. 65 MB
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The articles in this volume summarize the research results obtained in the former SFB 359 "Reactive Flow, Diffusion and Transport" which has been supported by the DFG over the period 1993-2004. The main subjects are physical-chemical processes sharing the difficulty of interacting diffusion, transport and reaction which cannot be considered separately. The modeling and simulation within this book is accompanied by experiments.

Modeling And Simulation Of Turbulent Combustion

Author : Santanu De
ISBN : 9789811074103
Genre : Science
File Size : 24. 32 MB
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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.

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