Evolution Of Three Dimensional Disturbances In A Mixing Layer
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Evolution Of Three Dimensional Disturbances In A Mixing Layer
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Author : Yeng Bun
language : en
Publisher:
Release Date : 1991
Evolution Of Three Dimensional Disturbances In A Mixing Layer written by Yeng Bun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Green's functions categories.
The Three Dimensional Evolution Of A Plane Mixing Layer Part 2
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-17
The Three Dimensional Evolution Of A Plane Mixing Layer Part 2 written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-17 with categories.
The evolution of three-dimensional temporally evolving plane mixing layers through as many as three pairings was simulated numerically. Initial conditions for all simulations consisted of a few low-wavenumber disturbances, usually derived from linear stability theory, in addition to the mean velocity. Three-dimensional perturbations were used with amplitudes ranging from infinitesimal to large enough to trigger a rapid transition to turbulence. Pairing is found both to inhibit the growth of infinitesimal three-dimensional disturbances and to trigger the transition to turbulence in highly three dimensional flows. The mechanisms responsible for the growth of three-dimensionality as well as the initial phases of the transition to turbulence are described. The transition to turbulence is accompanied by the formation of thin sheets of span wise vorticity, which undergo a secondary roll up. Transition also produces an increase in the degree of scalar mixing, in agreement with experimental observations of mixing transition. Simulations were also conducted to investigate changes in span wise length scale that may occur in response to the change in stream wise length scale during a pairing. The linear mechanism for this process was found to be very slow, requiring roughly three pairings to complete a doubling of the span wise scale. Stronger three-dimensionality can produce more rapid scale changes but is also likely to trigger transition to turbulence. No evidence was found for a change from an organized array of rib vortices at one span wise scale to a similar array at a larger span wise scale. Moser, Robert D. and Rogers, Michael M. Ames Research Center...
The Three Dimensional Evolution Of A Plane Mixing Layer Part 1
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-17
The Three Dimensional Evolution Of A Plane Mixing Layer Part 1 written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-17 with categories.
The Kelvin Helmholtz roll up of three dimensional, temporally evolving, plane mixing layers were simulated numerically. All simulations were begun from a few low wavenumber disturbances, usually derived from linear stability theory, in addition to the mean velocity profile. The spanwise disturbance wavelength was taken to be less than or equal to the streamwise wavelength associated with the Kelvin Helmholtz roll up. A standard set of clean structures develop in most of the simulations. The spanwise vorticity rolls up into a corrugated spanwise roller, with vortex stretching creating strong spanwise vorticity in a cup shaped region at the vends of the roller. Predominantly streamwise rib vortices develop in the braid region between the rollers. For sufficiently strong initial three dimensional disturbances, these ribs collapse into compact axisymmetric vortices. The rib vortex lines connect to neighboring ribs and are kinked in the opposite direction of the roller vortex lines. Because of this, these two sets of vortex lines remain distinct. For certain initial conditions, persistent ribs do not develop. In such cases the development of significant three dimensionality is delayed. When the initial three dimensional disturbance energy is about equal to, or less than, the two dimensional fundamental disturbance energy, the evolution of the three dimensional disturbance is nearly linear (with respect to the mean and the two dimensional disturbances), at least until the first Kelvin Helmholtz roll up is completed. Rogers, Michael M. and Moser, Robert D. Ames Research Center...
The Three Dimensional Evolution Of A Plane Mixing Layer Part 2 Pairing And Transition To Turbulence
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Author :
language : en
Publisher:
Release Date : 1992
The Three Dimensional Evolution Of A Plane Mixing Layer Part 2 Pairing And Transition To Turbulence written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 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.
Evolution Of Disturbances In Three Dimensional Boundary Layers
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Author : P. Balakumar
language : en
Publisher:
Release Date : 2000
Evolution Of Disturbances In Three Dimensional Boundary Layers written by P. Balakumar 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.
Direct Numerical Simulation Of Evolution And Control Of Linear And Nonlinear Disturbances In Three Dimensional Attachment Line Boundary Layers
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Author : Ronald D. Joslin
language : en
Publisher:
Release Date : 1997
Direct Numerical Simulation Of Evolution And Control Of Linear And Nonlinear Disturbances In Three Dimensional Attachment Line Boundary Layers written by Ronald D. Joslin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Turbulent boundary layer categories.
On The Origin And Evolution Of Three Dimensional Effects In The Mixing Layer
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Author :
language : en
Publisher:
Release Date : 1979
On The Origin And Evolution Of Three Dimensional Effects In The Mixing Layer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
There seems to be at least two different phenomena connected with the three-dimensional breakdown of the plane mixing layer. First, at least in some cases, there is a macroscopic instability of the large structure which produces a spanwise system of longitudinal jets whose amplitude builds up very quickly and then remains approximately constant while their separation adjust itself to a value that is somewhat higher that the vorticity thickness of the layer. This phenomenon may be due to a collective instability of the vortex cores of the same type as the one found in vortex rings. The second phenomenon is the development of a 3-D inertial subrange in the spectrum of the small scales of the velocity fluctuations. In the only case in which we have documented both phenomena the second one does not develop fully until the macroscopic instability has not been growing for some time and has actually arrived to what seems to be its final configuration. Moreover there is some indication that there are two qualitatively different ways for the establishment of the 3-D inertial ranges, exemplified here by the water and air experiments. In the first one the transition is abrupt and there is an initial part in which the inertial range has a slope characteristic of the 2-D entrophy cascade. In the second one the transition is more gradual and there is no evidence of a 2-D regime. It is not clear at present which is the condition responsible for the differences between the two cases. The work presented in this report should be seen as a preliminary exploration of the effects connected with the 3-D transition. Much more research is needed in all cases.
On The Origin And Evolution Of Three Dimensional Effects In The Mixing Layer Final Technical Report
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Author : Javier Jimenez
language : en
Publisher:
Release Date : 1979
On The Origin And Evolution Of Three Dimensional Effects In The Mixing Layer Final Technical Report written by Javier Jimenez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
The Origin Of Turbulence In Near Wall Flows
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Author : A.V. Boiko
language : en
Publisher: Springer Science & Business Media
Release Date : 2002-01-22
The Origin Of Turbulence In Near Wall Flows written by A.V. Boiko 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 2002-01-22 with Science categories.
This book presents a comprehensive survey of the origin of turbulence in near-wall shear layer flows. Instead of going too far into details modern approaches to the problem are discussed in a conceptual treatment. The transition from laminar to turbulent flows in shear layers is described including the generation of flow perturbations, their amplification and development, the breakdown of the initial laminar state, and transformation to a turbulent regime. This book also presents new approaches to boundary-layer transitions with strong external-flow perturbations and to the prediction and control of the presented near-wall transitions to turbulence. This book is addressed to researchers, lecturers and students in engineering, physics and mathematics.
