The Kinematics Of Turbulent Boundary Layer Structure
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The Kinematics Of Turbulent Boundary Layer Structure
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Author : Stephen Kern Robinson
language : en
Publisher:
Release Date : 1991
The Kinematics Of Turbulent Boundary Layer Structure written by Stephen Kern Robinson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Kinematics categories.
Investigation Of The Turbulence Producing Structures In The Boundary Layer
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Author : Stephen Jay Kline
language : en
Publisher:
Release Date : 1991
Investigation Of The Turbulence Producing Structures In The Boundary Layer written by Stephen Jay Kline and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Boundary layer categories.
Turbulent Boundary Layer Structure And Drag Reduction
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Author :
language : en
Publisher:
Release Date : 1981
Turbulent Boundary Layer Structure And Drag Reduction 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 categories.
Work progressed along the following lines: i) completion of the development of kinematic wave theory for propagation of waves for wave trains or wave packets with small dissipation through homogeneous or non-homogeneous media; ii) development of a simplified model for the influence of a large eddy breakup device on turbulent boundary layer eddies; iii) completion of experimental and theoretical studies of transition spots in a plane channel flow; iv) preparation of experimental research on flat-plate laminar and turbulent boundary layers. (JHD).
A Study Of Turbulent Boundary Layer Structure
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Author : John Leask Lumley
language : en
Publisher:
Release Date : 1986
A Study Of Turbulent Boundary Layer Structure written by John Leask Lumley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Boundary layer categories.
The Effects Of Streamwise Concave Curvature On Turbulent Boundary Layer Structure
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Author : Albert H. Jeans
language : en
Publisher:
Release Date : 1982
The Effects Of Streamwise Concave Curvature On Turbulent Boundary Layer Structure written by Albert H. Jeans and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Turbulent boundary layer categories.
Concave curvature has a relatively large, unpredictable effect on turbulent boundary layers. Some, but not all previous studies suggest that a large-scale, stationary array of counter-rotating vortices exists within the turbulent boundary layer on a concave wall. The objective of the present study was to obtain a qualitative model of the flow field in order to increase our understanding of the underlying physics. A large free-surface water channel was constructed in order to perform a visual study of the flow. Streamwise components of mean velocity and turbulence intensity were measured using a hot film anemometer. The upstream boundary was spanwise uniform with a momentum thickness to radius of curvature of 0.05. Compared to flat wall flow, large-scale, randomly distributed sweeps and ejections were seen in the boundary layer on the concave wall. The sweeps appear to suppress the normal mechanism for turbulence production near the wall by inhibiting the bursting process. The ejections appear to enhance turbulence production in the outer layers as the low speed fluid convected from regions near the wall interacts with the higher speed fluid farther out. The large-scale structures did not occur at fixed spanwise locations, and could not be called roll cells or vortices. (Author).
Workshop On Coherent Structure Of Turbulent Boundary Layers
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Author : C. R. Smith
language : en
Publisher:
Release Date : 1978
Workshop On Coherent Structure Of Turbulent Boundary Layers written by C. R. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Turbulence categories.
A discussion of the role of visual and probe measurements in turbulent structure research is given, stressing the constraining limitations of each and the interrelationships of the two methods. A selective history of the use of visual results is discussed in terms of the constraining limitations of the visual methods. Retrospective remarks are presented concerning the Stanford visual data on the inner portions of turbulent boundary layer structure. The final section discusses some general features of what is currently known about the structure of turbulent boundary layers, draws conclusions from this general knowledge, and poses questions that seem currently important in gaining further understanding. The paper stresses overall aspects of the structure problem at the expense of details in an attempt to gain perspective. (Author).
Three Dimensional Turbulent Boundary Layers
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Author : O. Sendstad
language : en
Publisher:
Release Date : 1992
Three Dimensional Turbulent Boundary Layers written by O. Sendstad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Simulation methods categories.
The Physics Of Turbulence In The Boundary Layer
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-13
The Physics Of Turbulence In The Boundary Layer 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 2018-07-13 with categories.
The geometry of the velocity field in a numerically simulated incompressible turbulent boundary layer over a flat plate at Re theta=670 has been studied using the invariants of the velocity gradient tensor. These invariants are computed at every grid point in the flow and used to form the discriminant. Of primary interest are those regions in the flow where the discriminant is positive; regions where, according to the characteristic equation, the eigenvalues of the velocity gradient tensor are complex. An observer moving with a frame of reference which is attached to a fluid particle lying within such a region would see a local flow pattern of the type stable-focus-stretching or unstable-focus-compressing. When the flow is visualized this way, continuous, connected, large-scale structures are revealed that extend from the point just below the buffer layer out to the beginning of the wake region. These structures are aligned with the mean shear close to the wall and arch in the cross-stream direction away from the wall. In some cases the structures observed are very similar to to the hairpin eddy vision of boundary layer structure proposed by Theodorsen. That the structure of the flow is revealed more effectively by the discriminant rather than by the vorticity is important and adds support to recent observations of the discriminant in a channel flow simulation. Of particular importance is the fact that the procedure does not require the use of an arbitrary threshold in the discriminant. Further analysis using computer flow visualization shows a high degree of spatial correlation between regions of positive discriminant, extreme negative pressure fluctuations and large instantaneous values of Reynolds shear stress. Kline, Stephen and Cantwell, Brian Unspecified Center NAG1-1610...
Turbulence Structure And Modulation
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Author : Alfredo Soldati
language : en
Publisher: Springer
Release Date : 2014-05-04
Turbulence Structure And Modulation written by Alfredo Soldati and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-05-04 with Technology & Engineering categories.
Controlling turbulence is an important issue for a number of technological applications. Several methods to modulate turbulence are currently being investigated. This book describes various aspects of turbulence structure and modulation, and explains and discusses the most promising techniques in detail.
Turbulent Boundary Layer Structure As Viewed From A Moving Reference Frame
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Author : C. R. Smith
language : en
Publisher:
Release Date : 1978
Turbulent Boundary Layer Structure As Viewed From A Moving Reference Frame written by C. R. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.