Second Order Closure Of Turbulent Reacting Shear Flows
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Second Order Closure Of Turbulent Reacting Shear Flows
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Author : Ashok K. Varma
language : en
Publisher:
Release Date : 1976
Second Order Closure Of Turbulent Reacting Shear Flows written by Ashok K. Varma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
For a number of turbulent flow problems, a first-order closure or eddy transport approach to the modeling of the turbulence is not sufficiently accurate. It is necessary that a more powerful approach be used to study the dynamics of the turbulence. Flows involving chemical reactions, such as those in a chemical laser, are good examples of flows requiring a more powerful approach. The mixing in HF and DF chemical lasers takes place under conditions of very large heat release. The coupling between the heat release and the turbulence is an important feature of the flow. A.R.A.P. has been funded to employ this basic method to investigate problems connected with chemical lasers of particular interest to the Air Force Weapons Laboratory. These studies have resulted in considerable insight into the complex processes occurring in laser cavities. This report describes recent results of studies using the reacting shear layer (RSL) computer program and discusses the proposed procedure for handling multi-step chemical reactions in a second-order closure computation of turbulent reacting flows.
Second Order Closure Model For Turbulent Reacting Flows
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Author : Mohammad Farshchi
language : en
Publisher:
Release Date : 1985
Second Order Closure Model For Turbulent Reacting Flows written by Mohammad Farshchi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Second Order Modeling Of Turbulent Reacting Flows With Intermittency And Conditional Averaging
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Author : Jyh-Yuan Chen
language : en
Publisher:
Release Date : 1985
Second Order Modeling Of Turbulent Reacting Flows With Intermittency And Conditional Averaging written by Jyh-Yuan Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Fluid dynamics categories.
Turbulent Mixing In Nonreactive And Reactive Flows
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Author : S. Murthy
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Turbulent Mixing In Nonreactive And Reactive Flows written by S. Murthy and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
Turbulence, mixing and the mutual interaction of turbulence and chemistry continue to remain perplexing and impregnable in the fron tiers of fluid mechanics. The past ten years have brought enormous advances in computers and computational techniques on the one hand and in measurements and data processing on the other. The impact of such capabilities has led to a revolution both in the understanding of the structure of turbulence as well as in the predictive methods for application in technology. The early ideas on turbulence being an array of complicated phenomena and having some form of reasonably strong coherent struc ture have become well substantiated in recent experimental work. We are still at the very beginning of understanding all of the aspects of such coherence and of the possibilities of incorporating such structure into the analytical models for even those cases where the thin shear layer approximation may be valid. Nevertheless a distinguished body of "eddy chasers" has come into existence. The structure of mixing layers which has been studied for some years in terms of correlations and spectral analysis is also getting better understood. Both probability concepts such as intermittency and conditional sampling as well as the concept of large scale structure and the associated strain seem to indicate possibilities of distinguishing and synthesizing 'engulfment' and molecular mixing.
Turbulent Shear Flows In Laser Nozzles And Cavities
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Author : Ashok K. Varma
language : en
Publisher:
Release Date : 1974
Turbulent Shear Flows In Laser Nozzles And Cavities written by Ashok K. Varma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with categories.
An invariant second-order closure program for compressible, turbulent, reacting shear flows is being developed. The development of models for the third and higher-order correlations that appear in the transport equations has been completed. A 'typical eddy' box model has been developed for computation of higher-roder scalar correlations involving species, temperatures and reaction rate fluctuations. A single species second-order closure program for compressible shear flows has been applied to study a simulation of the mixing region in a HF chemical laser. Considerable insight into the complex processes occurring in laser cavities has been achieved. The results show that the assumptions used in the eddy viscosity and the turbulent kinetic energy closure methods are not completely valid for nonequilibrium flows such as in the chemical laser system. The results of studies of other shear flows with the same invariant second-order model are in generally good agreement with experimental measurements. (Modified author abstract).
Closure Strategies For Turbulent And Transitional Flows
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Author : B. E. Launder
language : en
Publisher: Cambridge University Press
Release Date : 2002-02-21
Closure Strategies For Turbulent And Transitional Flows written by B. E. Launder and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-02-21 with Mathematics categories.
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Statistical Mechanics Of Turbulent Flows
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Author : Stefan Heinz
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Statistical Mechanics Of Turbulent Flows written by Stefan Heinz and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Science categories.
The simulation of technological and environmental flows is very important for many industrial developments. A major challenge related to their modeling is to involve the characteristic turbulence that appears in most of these flows. The traditional way to tackle this question is to use deterministic equations where the effects of turbulence are directly parametrized, i. e. , assumed as functions of the variables considered. However, this approach often becomes problematic, in particular if reacting flows have to be simulated. In many cases, it turns out that appropriate approximations for the closure of deterministic equations are simply unavailable. The alternative to the traditional way of modeling turbulence is to construct stochastic models which explain the random nature of turbulence. The application of such models is very attractive: one can overcome the closure problems that are inherent to deterministic methods on the basis of relatively simple and physically consistent models. Thus, from a general point of view, the use of stochastic methods for turbulence simulations seems to be the optimal way to solve most of the problems related to industrial flow simulations. However, it turns out that this is not as simple as it looks at first glance. The first question concerns the numerical solution of stochastic equations for flows of environmental and technological interest. To calculate industrial flows, 3 one often has to consider a number of grid cells that is of the order of 100 .
Conditional Second Order Closure For Turbulent Shear Flows
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Author : W. Kollman
language : en
Publisher:
Release Date : 1987
Conditional Second Order Closure For Turbulent Shear Flows written by W. Kollman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
Second order turbulence closure models for conditional moments and the intermittency factor were developed. Methods for the treatment of turbulent/non-turbulent and other scalar interfaces were applied to the plane mixing layer and round jet. Multiscale closure models based on the dissipation rate were developed and applied to homogeneous turbulence and the plane jet. Scalar transport was investigated using the separation probability of clusters of particles and numerical solutions based on stochastic simulation techniques. A direct extension of conditional closure to velocity-scalar pdf equations was also developed.
A Second Order Closure Analysis Of Turbulent Diffusion Flames
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Author :
language : en
Publisher:
Release Date : 1977
A Second Order Closure Analysis Of Turbulent Diffusion Flames written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Second Order Modeling Of Boundary Free Turbulent Shear Flows
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Author : T. H. Shih
language : en
Publisher:
Release Date : 1991
Second Order Modeling Of Boundary Free Turbulent Shear Flows written by T. H. Shih and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Jets categories.