The Three Dimensional Evolution Of A Plane Mixing Layer Part 2

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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 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 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.

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.

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.

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.

Mixing And Dispersion In Stably Stratified Flows

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Author : P. A. Davies
language : en
Publisher: Oxford University Press
Release Date : 1999

Mixing And Dispersion In Stably Stratified Flows written by P. A. Davies and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Diffusion in hydrology categories.

Stratified flows are important in determining how various atmospheric and environmental processes occur. The book investigates these processes and focuses on the methods by which pollutants are mixed and dispersed in natural and industrial environments.