The Three Dimensional Evolution Of A Plane Mixing Layer Part 1

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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 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.

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.

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.

Curved Two Stream Mixing Layers Part 1 Three Dimensional Structure And Part 2 Streamwise Evolution

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Author : Stanford University. Thermosciences Division. Thermosciences Division
language : en
Publisher:
Release Date : 1993

Curved Two Stream Mixing Layers Part 1 Three Dimensional Structure And Part 2 Streamwise Evolution written by Stanford University. Thermosciences Division. Thermosciences Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.

Three Dimensional Structure Of Plane Mixing Layers

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Author : James Horatio Bell
language : en
Publisher:
Release Date : 1989

Three Dimensional Structure Of Plane Mixing Layers written by James Horatio Bell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

Three Dimensional Structure Of A Plane Mixing Layer

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Author : James H. Bell
language : en
Publisher:
Release Date : 1989

Three Dimensional Structure Of A Plane Mixing Layer written by James H. Bell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

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 Plane Mixing Layer Flow Visualization Results And Three Dimensional Effects

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Author : A. Roshko
language : en
Publisher:
Release Date : 1980

The Plane Mixing Layer Flow Visualization Results And Three Dimensional Effects written by A. Roshko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.

The turbulent mixing layer between two streams of different velocities continues to play a central role in research aimed at improved understanding of turbulent shear flows in general. At present, not all researchers are in agreement as to what various experiments imply about the structure of mixing layers at high Reynolds number. The views which are held differ on the question as to how and to what extent three dimensionality develops in these flows and whether the characteristic spanwise organized large vortex structures (rollers) continue to be a dominant feature. The traditional view, as extended to the contemporary scene, is that ultimately (i.e., sufficiently far downstream or at sufficiently high Reynolds number) the flow will be completely disorganized. The view put forward by 'eddy chasers' is that such vortex structures are primary elements, characteristic of the underlying mean vorticity field, which is particularly simple for the mixing layer, and that, as long as the velocity difference is maintained, there is a mechanism to regenerate these primary structures by what, for convenience, may be called a Kelvin-Helmholtz instability. The heart of the controversy then is whether, or to what extent, secondary and higher instabilities will ultimately break down, completely disorganize or prevent formation of organized primary structures. In a plane mixing layer, the primary structures would, ideally, be two dimensional, containing the basic single component of vorticity while secondary and higher modes of instability would introduce three dimensionality and the other two components of vorticity into the flow. (Author).

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.