On The Origin And Evolution Of Three Dimensional Effects In The Mixing Layer
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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.
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.
Research In Progress
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Author :
language : en
Publisher:
Release Date : 1976
Research In Progress written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Military research categories.
The Global Geometry Of Turbulence
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Author : Javier Jiménez
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
The Global Geometry Of Turbulence written by Javier Jiménez 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 2012-12-06 with Science categories.
The aim of this Advanced Research Workshop was to bring together Physicists, Applied Mathematicians and Fluid Dynamicists, including very specially experimentalists, to review the available knowledge on the global structural aspects of turbulent flows, with an especial emphasis on open systems, and to try to reach a consensus on their possible relationship to recent advances in the understanding of the behaviour of low dimensional dynamical systems and amplitude equations. A lot has been learned during recent years on the non-equilibrium behaviour of low dimen sional dynamical systems, including some fluid flows (Rayleigh-Benard, Taylor-Couette, etc. ). These are mostly closed flows and many of the global structural features of the low dimensional systems have been observed in them, including chaotic behaviour, period doubling, intermit tency, etc. . It has also been shown that some of these flows are intrinsically low dimensional, which accounts for much of the observed similarities. Open flows seem to be different, and experimental observations point to an intrinsic high dimensionality. However, some of the tran sitional features of the low dimensional systems have been observed in them, specially in the intermittent behaviour of subcritical flows (pipes, channels, boundary layers with suction, etc. ), and in the large scale geometry of coherent structures of free shear flows (mixing layers, jets and wakes).
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.
Research In Progress Between And
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Author : United States. Army Research Office
language : en
Publisher:
Release Date : 1978
Research In Progress Between And written by United States. Army Research Office and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Military research categories.
Turbulent Shear Flows 7
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Author : Franz Durst
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Turbulent Shear Flows 7 written by Franz Durst 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 2012-12-06 with Science categories.
The Seventh Symposium was held on the campus of Stanford University with·a combination offacilities and weather which made it possible to add open-air poster sessions and coffee breaks to the programme. This was particularly convenient as the call for papers attracted close to three hundred abstracts and a total number of participants well in excess of this number. Some one hundred and thirty papers were presented in carefully phased parallel sessions and thirty six further contributions were made available in the form of posters. In addition, a lively open-forum session allowed additional speakers to make brief presentations. The staff of the Thermo-Sciences Division of the Department of Mechanical Engineering at Stanford undertook the local arrangements with evident success and their extensive record of contributions to Turbulent Shear Flows made the venue particularly appropriate. Also, the Centre for Turbulence Studies, based on the faculty of the University and the NASA Ames Research Center, provided a considerable body of expertise with emphasis on direct numerical stimulation.
Eddy Structure Identification In Free Turbulent Shear Flows
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Author : J.P. Bonnet
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Eddy Structure Identification In Free Turbulent Shear Flows written by J.P. Bonnet 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 2012-12-06 with Technology & Engineering categories.
The existence and crucial role played by large-scale, organized motions in turbulent flows are now recognized by industrial, applied and fundamental researchers alike. It has become increasingly evident that coherent structures influence mixing, noise, vibration, heat transfer, drag, etc... The accelera tion of the development of both experimental and computational programs devoted to this topic has been evident at several recent international meet ings. One of the first questions which experimentalists or numerical analysts are faced with is: how can these structures be separated from the background turbulence? This is a nontrivial task because the coherent structures are gen erally embedded in a random field and the technique used to determine when and where certain structures are passing, or their averaged characteristics (in the more probable or dominant role sense) is directly related to the definition of the coherent structure. Several methods or approaches are available and the choice of a particular one is generally dependent on the desired informa tion. This choice depends not only on the definition of the structure, but also on the experimental and numerical capabilities available to the researcher.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date : 1981
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.
