Three Dimensional Structure Of Plane Mixing Layers
DOWNLOAD
Download Three Dimensional Structure Of Plane Mixing Layers PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Three Dimensional Structure Of Plane Mixing Layers book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Three Dimensional Structure Of Plane Mixing Layers
DOWNLOAD
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
DOWNLOAD
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.
The Plane Mixing Layer Flow Visualization Results And Three Dimensional Effects
DOWNLOAD
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).
Curved Two Stream Mixing Layers Part 1 Three Dimensional Structure And Part 2 Streamwise Evolution
DOWNLOAD
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.
The Three Dimensional Evolution Of A Plane Mixing Layer Part 1
DOWNLOAD
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...
Three Dimensional Large Scale Coherent Structures In A Developing Plane Mixing Layer
DOWNLOAD
Author : Taewon Seo
language : en
Publisher:
Release Date : 1993
Three Dimensional Large Scale Coherent Structures In A Developing Plane Mixing Layer written by Taewon Seo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Fluid dynamics categories.
The Three Dimensional Evolution Of A Plane Mixing Layer Part 2 Pairing And Transition To Turbulence
DOWNLOAD
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
DOWNLOAD
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.
The Three Dimensional Evolution Of A Plane Mixing Layer Part 1 The Kelvin Helmholtz Roll Up
DOWNLOAD
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.
Design And Calibration Of The Mixing Layer And Wind Tunnel
DOWNLOAD
Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07
Design And Calibration Of The Mixing Layer And Wind Tunnel 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 with categories.
A detailed account of the design, assembly and calibration of a wind tunnel specifically designed for free-shear layer research is contained. The construction of this new facility was motivated by a strong interest in the study of plane mixing layers with varying initial and operating conditions. The Mixing Layer Wind tunnel is located in the Fluid Mechanics Laboratory at NASA Ames Research Center. The tunnel consists of two separate legs which are driven independently by centrifugal blowers connected to variable speed motors. The blower/motor combinations are sized such that one is smaller than the other, giving maximum flow speeds of about 20 and 40 m/s, respectively. The blower speeds can either be set manually or via the Microvax II computer. The two streams are allowed to merge in the test section at the sharp trailing edge of a slowly tapering splitter plate. The test section is 36 cm in the cross-stream direction, 91 cm in the spanwise direction and 366 cm in length. One test section side-wall is slotted for probe access and adjustable so that the streamwise pressure gradient may be controlled. The wind tunnel is also equipped with a computer controlled, three-dimensional traversing system which is used to investigate the flow fields with pressure and hot-wire instrumentation. The wind tunnel calibration results show that the mean flow in the test section is uniform to within plus or minus 0.25 pct and the flow angularity is less than 0.25 deg. The total streamwise free-stream turbulence intensity level is approximately 0.15 pct. Currently the wind tunnel is being used in experiments designed to study the three-dimensional structure of plane mixing layers and wakes. Bell, James H. and Mehta, Rabindra D. Unspecified Center NCC2-55...
