Numerical Analysis of the Interactions Between a Detonation Wave and Compressible Homogeneous Isotropic Turbulence PDF Download
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Author: Monika Chauhan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A numerical study was performed to investigate the effect of preshock turbulence on detonation wave properties. A direct numerical simulation was performed on the chemically reactive Navier-Stokes equations using a Runge-Kutta scheme and a fifth-order WENO spatial discretization. A simple one-step chemical kinetics model was used in the study. The main objective of the research is to examine the behavior of the turbulence when subjected to a strong shock with heat release. The evolution of the turbulent Mach number, lengthscales (Taylor microscale and Kolmogorov scale), turbulent kinetic energy, Reynolds stress, auto-correlations with heat release and activation energy is examined. Shock-turbulence interaction have been the subject of research for over the decades but there is no significant study that has yet been made on Detonation-Turbulence interaction. This research is helpful in practical applications such as safe handling of the fuels, promoting detonations for detonation engines etc. The results show a marked influence of preshock perturbations on the postshock statistics. Detonation-Turbulence interaction resulted in higher amplifications of turbulence statistics and parameters like turbulent Mach number, turbulent length scales (i.e. Taylor microscale, Kolmogorov length scale etc.), turbulent kinetic energy, velocity fluctuations, auto-correlations etc. The detonation event triggers a self-excited instability, evidenced by the velocity fluctuations and further by spacetime correlation functions. Also, the alteration to the limit cycle structure supported by unstable waves close to their critical points is highlighted. The effect of reactivity and fluid acceleration in the postshock region are examined by comparison with the non-reactive analog. The possibility that significant forcing can lead to hot-spot formation is investigated by considering temperature probability distribution functions in the reaction zone. The separate effect of vortical and entropic fluctuations is considered.
Author: Monika Chauhan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A numerical study was performed to investigate the effect of preshock turbulence on detonation wave properties. A direct numerical simulation was performed on the chemically reactive Navier-Stokes equations using a Runge-Kutta scheme and a fifth-order WENO spatial discretization. A simple one-step chemical kinetics model was used in the study. The main objective of the research is to examine the behavior of the turbulence when subjected to a strong shock with heat release. The evolution of the turbulent Mach number, lengthscales (Taylor microscale and Kolmogorov scale), turbulent kinetic energy, Reynolds stress, auto-correlations with heat release and activation energy is examined. Shock-turbulence interaction have been the subject of research for over the decades but there is no significant study that has yet been made on Detonation-Turbulence interaction. This research is helpful in practical applications such as safe handling of the fuels, promoting detonations for detonation engines etc. The results show a marked influence of preshock perturbations on the postshock statistics. Detonation-Turbulence interaction resulted in higher amplifications of turbulence statistics and parameters like turbulent Mach number, turbulent length scales (i.e. Taylor microscale, Kolmogorov length scale etc.), turbulent kinetic energy, velocity fluctuations, auto-correlations etc. The detonation event triggers a self-excited instability, evidenced by the velocity fluctuations and further by spacetime correlation functions. Also, the alteration to the limit cycle structure supported by unstable waves close to their critical points is highlighted. The effect of reactivity and fluid acceleration in the postshock region are examined by comparison with the non-reactive analog. The possibility that significant forcing can lead to hot-spot formation is investigated by considering temperature probability distribution functions in the reaction zone. The separate effect of vortical and entropic fluctuations is considered.
Author: Sangsan Lee
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 0
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Book Description
As a first step to understand the compressibility effects, interaction of isotropic quasi-incompressible turbulence with a weak shock wave was studied by three-dimensional time-dependent direct numerical simulations. In addition, linear analysis was used to study interaction of isotropic turbulence with shock waves of a wide range of strengths. The effects of the fluctuation Mach number M sub t and the average Mach number M sub 1 superscript u of the upstream turbulence on turbulence statistics were investigated. Both numerical simulations and linear analyses of the interaction show that turbulence is enhanced during the interaction with a shock wave. Turbulent kinetic energy (TKE) and transverse vorticity components are amplified, and turbulent length scales are decreased. The predictions of the linear analyses compare favorably with simulation results for flows with M sub t
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1166
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Book Description
Author: Paul Durbin
Publisher: Elsevier
ISBN: 0128208902
Category : Technology & Engineering
Languages : en
Pages : 554
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Book Description
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
Author: Stanford University. Thermosciences Division. Thermosciences Division
Publisher:
ISBN:
Category :
Languages : en
Pages : 260
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Book Description
Author: Pierre Sagaut
Publisher: Springer
ISBN: 3319731629
Category : Science
Languages : en
Pages : 912
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Book Description
This book provides state-of-the-art results and theories in homogeneous turbulence, including anisotropy and compressibility effects with extension to quantum turbulence, magneto-hydodynamic turbulence and turbulence in non-newtonian fluids. Each chapter is devoted to a given type of interaction (strain, rotation, shear, etc.), and presents and compares experimental data, numerical results, analysis of the Reynolds stress budget equations and advanced multipoint spectral theories. The role of both linear and non-linear mechanisms is emphasized. The link between the statistical properties and the dynamics of coherent structures is also addressed. Despite its restriction to homogeneous turbulence, the book is of interest to all people working in turbulence, since the basic physical mechanisms which are present in all turbulent flows are explained. The reader will find a unified presentation of the results and a clear presentation of existing controversies. Special attention is given to bridge the results obtained in different research communities. Mathematical tools and advanced physical models are detailed in dedicated chapters.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Book Description
Author: M.Y. Hussaini
Publisher: Springer
ISBN: 9780792330868
Category : Science
Languages : en
Pages : 372
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Book Description
These two volumes are concerned with current technologically important issues of transition, turbulence and combustion. Topics covered in transition include linear and nonlinear stability, direct and large-eddy simulation and phenomenological modelling of the transition zone. In turbulence, interest was focused on second-order closures and the formulation of near-wall corrections to existing high Reynolds number models, and closure model development based on turbulent flow structures and RNG theory. Topics covered in combustion include counterflow diffusion flames, development of novel mixing enhancement techniques for non-premixed combustion, and methods of modelling the interaction between turbulence and chemical kinetics. This collection of papers from leading researchers represents as yet unpublished state-of-the-art research, resulting in a very valuable tool for scientists and students working in areas of turbulence, transition and combustion.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 530
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Book Description
Author: Tomás Chacón Rebollo
Publisher: Springer
ISBN: 1493904558
Category : Mathematics
Languages : en
Pages : 530
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Book Description
With applications to climate, technology, and industry, the modeling and numerical simulation of turbulent flows are rich with history and modern relevance. The complexity of the problems that arise in the study of turbulence requires tools from various scientific disciplines, including mathematics, physics, engineering and computer science. Authored by two experts in the area with a long history of collaboration, this monograph provides a current, detailed look at several turbulence models from both the theoretical and numerical perspectives. The k-epsilon, large-eddy simulation and other models are rigorously derived and their performance is analyzed using benchmark simulations for real-world turbulent flows. Mathematical and Numerical Foundations of Turbulence Models and Applications is an ideal reference for students in applied mathematics and engineering, as well as researchers in mathematical and numerical fluid dynamics. It is also a valuable resource for advanced graduate students in fluid dynamics, engineers, physical oceanographers, meteorologists and climatologists.
