Numerical Simulation Of Two Dimensional Spatially Developing Mixing Layers
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Numerical Simulation Of Two Dimensional Spatially Developing Mixing Layers
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher:
Release Date : 2018-11
Numerical Simulation Of Two Dimensional Spatially Developing Mixing Layers written by National Aeronautics and Space Adm Nasa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11 with categories.
Two-dimensional, incompressible, spatially developing mixing layer simulations are performed at Re = 10(exp 2) and 10(exp 4) with two classes of perturbations applied at the inlet boundary; combinations of discrete modes from linear stability theory, and a broad spectrum of modes derived from experimentally measured velocity spectra. The effect of the type and strength of inlet perturbations on vortex dynamics and time-averaged properties are explored. Two-point spatial velocity and autocorrelations are used to estimate the size and lifetime of the resulting coherent structures and to explore possible feedback effects. The computed time-averaged properties such as mean velocity profiles, turbulent statistics, and spread rates show good agreement with experimentally measured values. It is shown that by forcing with a broad spectrum of modes derived from an experimental energy spectrum many experimentally observed phenomena can be reproduced by a 2-D simulation. The strength of the forcing merely affected the length required for the dominant coherent structures to become fully-developed. Thus intensities comparable to those of the background turbulence in many wind tunnel experiments produced the same results, given sufficient simulation length. Wilson, R. V. and Demuren, A. O. Unspecified Center NAS1-19480; RTOP 505-90-52-01...
Numerical Simulation Of Two Dimensional Spatially Developing Mixing Layers
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Author : R. V. Wilson
language : en
Publisher:
Release Date : 1994
Numerical Simulation Of Two Dimensional Spatially Developing Mixing Layers written by R. V. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Boundary layer categories.
Two-dimensional, incompressible, spatially developing mixing layer simulations are performed at Re = 10 2 and 10 4 with two classes of perturbations applied at the inlet boundary; (1) combinations of discrete modes from linear stability theory, and (2) a broad spectrum of modes derived from experimentally measured velocity spectra. The effect of the type and strength of inlet perturbations on vortex dynamics and time-averaged properties are explored. Two-point spatial velocity and autocorrelations are used to estimate the size and lifetime of the resulting coherent structures and to explore possible feedback effects. The computed time-averaged properties such as mean velocity profiles, turbulent statistics, and spread rates show good agreement with experimentally measured values. It is shown that by forcing with a broad spectrum of modes derived from an experimental energy spectrum many experimentally observed phenomena can be reproduced by a 2-D simulation. The strength of the forcing merely affected the length required for the dominant coherent structures to become fully-developed. Thus intensities comparable to those of the background turbulence in many wind tunnel experiments produced the same results, given sufficient simulation length. Mixing layers, Numerical simulation, Spatial simulation.
A Mixed Lagrangian Eulerian Approach For Numerical Simulation Of Mixing Layers And Uniformly Sheared Flow
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Author : Reza Abdolhosseini
language : en
Publisher:
Release Date : 2000
A Mixed Lagrangian Eulerian Approach For Numerical Simulation Of Mixing Layers And Uniformly Sheared Flow written by Reza Abdolhosseini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
The vortex-in-cell (VIC) method is applied for the prediction of the turbulent characteristics and flow development of the two-dimensional spatially growing mixing layer, the two-dimensional uniformly sheared flow and the three-dimensional uniformly sheared flow. The VIC method has the advantage that it requires less computational tune compared with the Lagrangian method. In the first part of thesis, the two-dimensional VIC method is validated by simulating a spatially growing mixing layer. The results show that the VIC method is capable of predicting the characteristics of the spatially growing mixing layers as well as the grid-free Lagrangian method. In the second part of thesis, the two-dimensional VIC method is used to simulate the uniformly sheared flow. In this new approach a combination of several adjacent mixing layers simulate the initial condition used to generate the uniformly sheared flow. Turbulent characteristics such as the mean velocity, the r.m.s. longitudinal and lateral velocity fluctuations and the Reynolds shear stress are predicted and compared with previous numerical and experimental works. In the third part of this work, three-dimensional simulation of uniformly sheared flows is performed as an extension of the two-dimensional simulation in order to take into account the effect of stretching which is a major contributor to turbulence production. The methodology is based on a mixed Lagrangian-Eulerian three-dimensional vortex-in-cell method. Histograms and two-angle probability distribution of the inclination angle of the vorticity vectors at the grid points with the horizontal plane indicate the presence of vortical structures at a 35°--40° angle with horizontal plane which is consistent with the results of Rogers and Moin (1987). The time evolution of the component energy ratios K11, K22 and K33 are calculated and compared with the previous works. Sensitivity to the numerical parameters is investigated and the results exhibited robustness to the numerical parameters.
A Two Dimensional Numerical Simulation Of A Supersonic Chemically Reacting Mixing Layer
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Author : John Philip Drummond
language : en
Publisher:
Release Date : 1988
A Two Dimensional Numerical Simulation Of A Supersonic Chemically Reacting Mixing Layer written by John Philip Drummond and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Fluid mechanics categories.
Direct Numerical Simulation Of Spatially Developing Compressible And Turbulent Mixing Layers
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Author : Calvin Lui
language : en
Publisher:
Release Date : 2001
Direct Numerical Simulation Of Spatially Developing Compressible And Turbulent Mixing Layers written by Calvin Lui and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The Three Dimensional Evolution Of A Plane Mixing Layer Part 1 The Kelvin Helmholtz Roll Up
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Author :
language : en
Publisher:
Release Date : 1991
The Three Dimensional Evolution Of A Plane Mixing Layer Part 1 The Kelvin Helmholtz Roll Up written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Numerical Simulation Of Spatially Developing Forced And Natural Mixing Layers With L E S
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Author : C. Pianese
language : en
Publisher:
Release Date : 1991
Numerical Simulation Of Spatially Developing Forced And Natural Mixing Layers With L E S written by C. Pianese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Numerical Simulation Of A Spatially Developing Forced Plane Mixing Layer
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Author : P. S. Lowery (Reynolds, W. C.)
language : en
Publisher:
Release Date : 1986
Numerical Simulation Of A Spatially Developing Forced Plane Mixing Layer written by P. S. Lowery (Reynolds, W. C.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
The spatial and temporal development of a forced, incompressible, plane mixing layer is simulated in this work. The full Navier-Stokes equations are solved without the imposition of a turbulence model. Therefore, the Reynolds.
Numerical Simulation Of Confined Spatially Developing Mixing Layers
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Author : Linda Sigalla
language : en
Publisher:
Release Date : 1990
Numerical Simulation Of Confined Spatially Developing Mixing Layers written by Linda Sigalla and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Direct Numerical Simulation Of An Unpremixed Jet Flame
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Author : P. Givi
language : en
Publisher:
Release Date : 1986
Direct Numerical Simulation Of An Unpremixed Jet Flame written by P. Givi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Direct numerical simulations have been used to study the effects of large coherent structures in two-dimensional, unpremixed, chemically reacting mixing layers under both temporally evolving and spatially developing assumptions. In the temporally evolving mixing layer calculations, a temperature dependent chemical reaction was incorporated into a computer code that uses pseudospectral numerical methods. The nonequilibrium effects leading to the local quenching of a diffusion flame were investigated. Results indicate that the primary important parameter to be considered for flame extinction is the local instantaneous scalar dissipation rate conditioned at the scalar stoichiometric value. At locations where this value is increased beyond a critical value, the local temperature decreases and the instantaneous reaction rate drops to zero, leading to local quenching of the flame. Purposes of simulating spatially developing flows, a two-dimensional, hybrid pseudospectral-finite difference code was constructed. The resulting code was tested with simulations of the pretransitional region of laboratory mixing layers. Examination of some of the statistical quantities obtained from the results of these simulations are in qualitative agreement with recent experimental data obtained at the California Institute of Technology and Stanford University. The asymmetric nature of the mixing processes has been numerically simulated.
