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Author : John Leask Lumley
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Study of Turbulent Boundary Layer Structure written by John Leask Lumley and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)
Download or read book A Study of Turbulent Boundary Layer Structure written by and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this investigation was to complete analysis of space-time correlation measurements of two velocity compents in the wall region of a turbulent pipe flow. The third component was obtained form continuity, and eigenfunctions of the cross-spectral density tensor extracted. Keywords: Large eddies; Turbulen boundary layer.
Author : F. A. Schraub
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.F/5 ( download)
Download or read book A Study of the Structure of the Turbulent Boundary Layer with and Without Longitudinal Pressure Gradients written by F. A. Schraub and published by . This book was released on 1965 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The existence of three regions of the turbulent boundary layer, each correlating with a distinct part of the non-dimensional mean velocity profile, was confirmed; these are: (a) wake or intermittent region (b) fully turbulent region (c) wall layer region. Details of the flow structure of these regions were further verified using a new hot-wire anemometer and an improved combined-time-streak marker hydrogen-bubble technique. Instantaneous spanwise velocity profiles over a large extent of the flow at many fixed y-positions across the layer were obtained. The study of the flow structure was extended to include both positive and negative pressure gradient flows, including a relaminarization flow. The hot-wire anemometer provided a means of obtaining detailed mean velocity profiles well within the sublayer region. The hydrogen-bubble combined-time streak marker visualization technique was shown to be a useful tool for quantitative measurement of time-dependent velocity fields. (Author).
Author : James G.. Brasseur
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Structure of High Reynolds Number Turbulent Boundary Layers written by James G.. Brasseur and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alexander J. Smits
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Structure of High Reynolds Number Turbulent Boundary Layers written by Alexander J. Smits and published by . This book was released on 1993 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephen Jay Kline
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (91 download)
Download or read book Investigation of the Turbulence Producing Structures in the Boundary Layer written by Stephen Jay Kline and published by . This book was released on 1991 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. C. Kaimal
Publisher : Oxford University Press
ISBN 13 : 0195362772
Total Pages : 304 pages
Book Rating : 4.1/5 (953 download)
Download or read book Atmospheric Boundary Layer Flows written by J. C. Kaimal and published by Oxford University Press. This book was released on 1994-01-06 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary layer meteorology is the study of the physical processes that take place in the layer of air that is most influenced by the earth's underlying surface. This text/reference gives an uncomplicated view of the structure of the boundary layer, the instruments available for measuring its mean and turbulent properties, how best to make the measurements, and ways to process and analyze the data. The main applications of the book are in atmospheric modelling, wind engineering, air pollution, and agricultural meteorology. The authors have pioneered research on atmospheric turbulence and flow, and are noted for their contributions to the study of the boundary layer. This important work will interest atmospheric scientists, meteorologists, and students and faculty in these fields.
Author : Peter W. Runstadler
Publisher :
ISBN 13 :
Total Pages : 616 pages
Book Rating : 4.:/5 (118 download)
Download or read book An Experimental Investigation of the Flow Structure of the Turbulent Boundary Layer written by Peter W. Runstadler and published by . This book was released on 1963 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Peter William Runstadler (Jr.)
Publisher :
ISBN 13 :
Total Pages : 342 pages
Book Rating : 4.F/5 ( download)
Download or read book An Experimental Investigation of the Flow Structure of the Turbulent Boundary Layer written by Peter William Runstadler (Jr.) and published by . This book was released on 1963 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carl Daniel Meinhart
Publisher :
ISBN 13 :
Total Pages : 504 pages
Book Rating : 4.:/5 (338 download)
Download or read book Investigation of Turbulent Boundary-layer Structure Using Particle-image Velocimetry written by Carl Daniel Meinhart and published by . This book was released on 1994 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle-image velocimetry (PIV) is used to measure instantaneous velocity fields in the streamwise wall-normal plane of a zero-pressure-gradient turbulent boundary layer. In total, 340 PIV realizations of the boundary layer were obtained at Reynolds numbers based on momentum thickness of Ree = 930, 2370 and 6845. Each realization contains approximately 10000 two-component velocity vectors which are accurate to within 0.4 to 1.0% of the free-stream velocity. The PIV results are used to examine coherent structures throughout the boundary layer and determine their Reynolds-number dependencies. Coherent structures have been an important part of turbulent boundary-layer research for more than thirty years. By understanding coherent structures, their Reynolds-number dependencies and their dynamical characteristics, engineers and scientists will be better able to control and predict turbulent flows. A 20 m long low-turbulence boundary-layer research facility was developed for the measurement of turbulent boundary layers using particle-image velocimetry. Hot-film anemometer measurements show that the turbulence intensities at the test section inlet are about 0.16%, at a free-stream velocity of 6 m/s. A PIV interrogation and vector-validation system was developed to conduct the PIV measurements efficiently. The interrogation system utilizes eight i860 array processors in parallel to achieve a peak aggregate performance of 640 Mflops. Using 128 x 128 pixel cross correlations, it processes 100 vectors per second. Two-dimensional maps of in-plane velocity vectors, spanwise vorticity, Reynolds stress, and streamwise and wall-normal velocity contours show the instantaneous structures in the overlap and outer regions of the boundary layer. Details of large-scale motions protruding into the free stream are clearly shown in the outer region. The overlap region consists of shear layers oriented at 45$spcirc$ from the wall and are associated with transverse vortical elements, which are located above and slightly downstream of the shear layers. Comparisons between measured coherent structures and theories of Theodorsen, Townsend and Perry et al. are given. Two-dimensional spatial correlation functions of streamwise velocity, wall-normal velocity, spanwise vorticity and Reynolds stress are used to examine the statistically relevant structure of the boundary layer and its Reynolds-number dependency. Stochastic estimation is used to estimate conditional eddies throughout the boundary layer and reveal their Reynolds-number dependencies.
Author : Alexander J. Smits
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fundamental Aspects of the Structure of Supersonic Turbulent Boundary Layers written by Alexander J. Smits and published by . This book was released on 1988 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : BO-JANG TU
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.L/5 ( download)
Download or read book TECHNICAL REPORT AN EXERIMENTAL STUDY OF THE STRUCTURE OF TURBULENCE NEAR THE WALL THROUGH CORRELATION MEASUREMENTS IN A THICK TURBULENT BOUNDARY LAYER written by BO-JANG TU and published by . This book was released on 1966 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book STRUCTURE OF TURBULENCE IN THE BOUNDARY LAYER NEAR THE WALL written by and published by . This book was released on 1968 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Albert H. Jeans
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.F/5 ( download)
Download or read book The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure written by Albert H. Jeans and published by . This book was released on 1982 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Author : Erich J. Plate
Publisher :
ISBN 13 :
Total Pages : 49 pages
Book Rating : 4.:/5 (227 download)
Download or read book An Experimental Study of Turbulent Boundary Layer Structure written by Erich J. Plate and published by . This book was released on 1964 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report covers work done in preparation for a systematic investigation of the nature of aerodynamic roughness, and of the effect of thermal stratification on the turbulence structure in forced convection environments over rough and smooth surfaces. The investigations are based on data taken in a meteorological wind tunnel. After completion of the tunnel check out, exploratory measurements were made of the distributions of velocity and temperature in a thermally stratified flow (of unstable stratification) and of the velocity profiles above small sample plates covered with different types of sand roughness. A study of the flow of air over flexible roughness was the first comprehensive study which lead to definite conclusions. While the wind tunnel was readied for experimental work, side studies were undertaken for developing techniques for measuring profiles of mean velocities and mean temperatures, and for measuring fluctuations of temperatures and of velocities.
Author : Cedrick Ansorge
Publisher : Springer
ISBN 13 : 3319450441
Total Pages : 180 pages
Book Rating : 4.3/5 (194 download)
Download or read book Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer written by Cedrick Ansorge and published by Springer. This book was released on 2016-09-15 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a study of strong stratification and turbulence collapse in the planetary boundary layer, opening a new avenue in this field. It is the first work to study all regimes of stratified turbulence in a unified simulation framework without a break in the paradigms for representation of turbulence. To date, advances in our understanding and the parameterization of turbulence in the stable boundary layer have been hampered by difficulties simulating the strongly stratified regime, and the analysis has primarily been based on field measurements. The content presented here changes that paradigm by demonstrating the ability of direct numerical simulation to address this problem, and by doing so to remove the uncertainty of turbulence models from the analysis. Employing a stably stratified Ekman layer as a simplified physical model of the stable boundary layer, the three stratification regimes observed in nature— weakly, intermediately and strongly stratified—are reproduced, and the data is subsequently used to answer key, long-standing questions. The main part of the book is organized in three sections, namely a comprehensive introduction, numerics, and physics. The thesis ends with a clear and concise conclusion that distills specific implications for the study of the stable boundary layer. This structure emphasizes the physical results, but at the same time gives relevance to the technical aspects of numerical schemes and post-processing tools. The selection of the relevant literature during the introduction, and its use along the work appropriately combines literature from two research communities: fluid dynamics, and boundary-layer meteorology.
Author : C. R. Smith
Publisher :
ISBN 13 :
Total Pages : 528 pages
Book Rating : 4.:/5 (12 download)
Download or read book Workshop on Coherent Structure of Turbulent Boundary Layers written by C. R. Smith and published by . This book was released on 1978 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
