An Analysis of the Modeling of Variable Density Turbulence
| Author | : Jordan M. MacInnes |
| Publisher | : |
| Total Pages | : 220 |
| Release | : 1980 |
| Genre | : |
| ISBN | : |
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An Analysis Of The Modeling Of Variable Density Turbulence
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Variable Density Fluid Turbulence
| Author | : P. Chassaing |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 387 |
| Release | : 2013-06-29 |
| Genre | : Science |
| ISBN | : 9401700753 |
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The first part aims at providing the physical and theoretical framework of the analysis of density variations in fully turbulent flows. Its scope is deliberately educational. In the second part, basic data on dynamical and scalar properties of variable density turbulent flows are presented and discussed, based on experimental data and/or results from direct numerical simulations. This part is rather concerned with a research audience. The last part is more directly devoted to an engineering audience and deals with prediction methods for turbulent flows of variable density fluid. Both first and second order, single point modeling are discussed, with special emphasis on the capability to include specific variable density / compressibility effects.
Advanced Approaches in Turbulence
| Author | : Paul Durbin |
| Publisher | : Elsevier |
| Total Pages | : 554 |
| Release | : 2021-07-24 |
| Genre | : Technology & Engineering |
| ISBN | : 0128208902 |
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Advanced Approaches in Turbulence: Theory, Modeling, Simulation and Data Analysis for Turbulent Flows focuses on the updated theory, simulation and data analysis of turbulence dealing mainly with turbulence modeling instead of the physics of turbulence. Beginning with the basics of turbulence, the book discusses closure modeling, direct simulation, large eddy simulation and hybrid simulation. The book also covers the entire spectrum of turbulence models for both single-phase and multi-phase flows, as well as turbulence in compressible flow. Turbulence modeling is very extensive and continuously updated with new achievements and improvements of the models. Modern advances in computer speed offer the potential for elaborate numerical analysis of turbulent fluid flow while advances in instrumentation are creating large amounts of data. This book covers these topics in great detail. Covers the fundamentals of turbulence updated with recent developments Focuses on hybrid methods such as DES and wall-modeled LES Gives an updated treatment of numerical simulation and data analysis
Turbulence Transport Equations for Variable-density Turbulence and Their Relationship to Two-field Models
| Author | : |
| Publisher | : |
| Total Pages | : 39 |
| Release | : |
| Genre | : |
| ISBN | : |
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This study gives an updated account of our current ability to describe multimaterial compressible turbulent flows by means of a one-point transport model. Evolution equations are developed for a number of second-order correlations of turbulent data, and approximations of the gradient type are applied to additional correlations to close the system of equations. The principal fields of interest are the one- point Reynolds tensor for variable-density flow, the turbulent energy dissipation rate, and correlations for density-velocity and density- density fluctuations. This single-field description of turbulent flows is compared in some detail to two-field flow equations for nonturbulent, highly dispersed flow with separate variables for each field. This comparison suggests means for improved modeling of some correlations not subjected to evolution equations.
Statistical Theory and Modeling for Turbulent Flows
| Author | : P. A. Durbin |
| Publisher | : John Wiley & Sons |
| Total Pages | : 347 |
| Release | : 2011-06-28 |
| Genre | : Science |
| ISBN | : 1119957524 |
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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.
Second-Order Closure Modeling of Variable Density Turbulent Flows
| Author | : Ashok Kumara Varmer |
| Publisher | : |
| Total Pages | : 37 |
| Release | : 1979 |
| Genre | : Combustion gases |
| ISBN | : |
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Mixing and Chemical reactions under turbulent flow conditions are a basic feature of the energy release processes in many combustion and propulsion systems. The development of predictive calculation procedures for these systems requires the understanding and modeling of coupling between turbulence and various physical and chemical processes. Second-order closure modeling of turbulent flows provides a rational framework for studying these interactions. Models for the scalar probability density function (pdf) have to be developed to achieve closure of turbulent transport equations for mixing and reacting flows. A delta function 'typical eddy' pdf model for two species flows has been developed and incorporated into a complete second-order closure computer program. The program has been used to study uniform and variable density flowfields and the model predictions have been compared to experimental measurements. The modeling of turbulence dynamics for variable density flows requires further improvement. However, the importance of modeling the higher-order scalar correlations has been demonstrated. A number of statistical constraints on three species flowfields have also been derived. These will be useful in the development of the 'typical eddy' pdf modelfor reacting flows. (Author).
Turbulent Flows
| Author | : G. Biswas |
| Publisher | : CRC Press |
| Total Pages | : 478 |
| Release | : 2002 |
| Genre | : Technology & Engineering |
| ISBN | : 9780849310140 |
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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.
Analysis of Weakly Compressible Turbulence Using Symmetry Methods and Direct Numerical Simulation
| Author | : Raphael Gotthard Harald Arlitt |
| Publisher | : Cuvillier Verlag |
| Total Pages | : 221 |
| Release | : 2005 |
| Genre | : |
| ISBN | : 3865373461 |
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Vortrag für die politische Schulung der Unteroffiziere in den Grenztruppen der Deutschen Demokratischen Republik zum Thema "Der Marxismus-Leninismus über Freiheit und Notwendigkeit - Disziplin und Initiative in der sozialistischen Armee - die Aufgaben der Unteroffiziere bei der Festigung von Disziplin und Ordnung"
| Author | : |
| Publisher | : |
| Total Pages | : 30 |
| Release | : 1977 |
| Genre | : |
| ISBN | : |
Download Vortrag für die politische Schulung der Unteroffiziere in den Grenztruppen der Deutschen Demokratischen Republik zum Thema "Der Marxismus-Leninismus über Freiheit und Notwendigkeit - Disziplin und Initiative in der sozialistischen Armee - die Aufgaben der Unteroffiziere bei der Festigung von Disziplin und Ordnung" Book in PDF, Epub and Kindle
Coarse Grained Simulation and Turbulent Mixing
| Author | : Fernando F. Grinstein |
| Publisher | : Cambridge University Press |
| Total Pages | : 481 |
| Release | : 2016-06-30 |
| Genre | : Technology & Engineering |
| ISBN | : 1316571742 |
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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.
