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Author : Alexander J. Smits
Publisher : Unknown
Page : 50 pages
File Size : 49,8 Mb
Release : 1993
Category : Reynolds number
ISBN : UOM:39015104974459
Author : James G.. Brasseur
Publisher : Unknown
Page : 30 pages
File Size : 50,6 Mb
Release : 1994
Category : Reynolds number
ISBN : UOM:39015104974475
Author : Peter W. Runstadler,Stephen Jay Kline,William C. Reynolds
Publisher : Unknown
Page : 326 pages
File Size : 48,7 Mb
Release : 1963
Category : Boundary layer
ISBN : UOM:39015104979458
A combination of visual and quantitative measurements is presented, providing a physical picture of the turbulent boundary layer flow structure on a flat plate. The flow structure is shown to consist of three zones, each zone has a one to one correspondence to the well known regions of the u+, y+ mean velocity profile. A wall layer region is shown to exist below y+ = 10. An apparently fully turbulent region exists corresponding to the logarithmic ''law of the wall'' and the ''buffer'' region. An intermittent zone appears to agree closely with the ''wake'' deviation region. An entirely new result of the investigation is the delineation of the structure of the wall layer region. This region is shown to contain a relatively regular structure of low and high velocity fluid streaks alternating in the span direction, together with the ejection of low momentum fluid into the outer flow. Correlations are given for the rate of ejection and the streak spacing. A qualitative description of other features of the wall layer region and the character of the remainder of the boundary layer flow structure is presented. (Author).
Author : A. A. R. Townsend
Publisher : Cambridge University Press
Page : 450 pages
File Size : 45,7 Mb
Release : 1976
Category : Mathematics
ISBN : 0521298199
Develops a physical theory from the mass of experimental results, with revisions to reflect advances of recent years.
Author : Robert M. Latin
Publisher : Unknown
Page : 362 pages
File Size : 41,6 Mb
Release : 1998-03-01
Category : Surface roughness
ISBN : 1423562135
A comprehensive study of rough-wall high speed (M=2.9) high Reynolds number (Re/m = 1.9. 10 to the 7th power) turbulent boundary layer flow was performed consisting of experimental, analytical, and numerical methods. Six wall topologies consisting of a smooth and five rough surfaces (two and three dimensional machined roughness plates; and 80, 36, and 20 grit sand-grain roughened plates) were studied. A confocal laser scan microscope was used to measure the topography of the sand grain roughnesses. The experimental measurement techniques included a convention Pitot pressure probe, laser Doppler velocimetry, hot wire anemometry; color schlieren and laser sheet Mie scattering images. Mean measurements included velocity, Mach number, density, and mass flux. Turbulent measurements included velocity and mass flux turbulence intensities, kinematic Reynolds shear stress, compressible Reynolds shear stress in two planes, and the traverse apparent mass flux. Kinematic turbulent flow statistical properties were found to scale by local mean quantities and displayed a weak dependence on surface roughness. Turbulent flow statistical properties with the explicit appearance of density did not scale by local mean quantities, and had a strong linear dependence on roughness. Surface roughness also had a significant effect on the flow structure size, angles, and energy spectra. A theoretical analysis was performed and a new integral method for the estimation of skin friction was developed. The skin friction estimates were within 4% of compressible semi-empirical relations. A numerical study was performed which used a parabolized Navier Stokes solver with two algebraic turbulence models and the Rotta model for surface roughness. A new method for the estimation of momentum loss improved the numerical flow predictability.
Author : O. Sendstad,Parviz Moin
Publisher : Unknown
Page : 130 pages
File Size : 47,9 Mb
Release : 1992
Category : Simulation methods
ISBN : UOM:39015104974491
Author : Andreas Dillmann,Gerd Heller,Ewald Krämer,Claus Wagner,Cameron Tropea,Suad Jakirlić
Publisher : Springer Nature
Page : 867 pages
File Size : 52,7 Mb
Release : 2019-09-26
Category : Technology & Engineering
ISBN : 9783030252533
This book gathers contributions to the 21st biannual symposium of the German Aerospace Aerodynamics Association (STAB) and the German Society for Aeronautics and Astronautics (DGLR). The individual chapters reflect ongoing research conducted by the STAB members in the field of numerical and experimental fluid mechanics and aerodynamics, mainly for (but not limited to) aerospace applications, and cover both nationally and EC-funded projects. Special emphasis is given to collaborative research projects conducted by German scientists and engineers from universities, research-establishments and industries. By addressing a number of cutting-edge applications, together with the relevant physical and mathematics fundamentals, the book provides readers with a comprehensive overview of the current research work in the field. The book’s primary emphasis is on aerodynamic research in aeronautics and astronautics, and in ground transportation and energy as well.
Author : Anonim
Publisher : AIAA
Page : 542 pages
File Size : 45,9 Mb
Release : 1990
Category : Boundary layer
ISBN : 1600863787
Author : Alexander J. Smits
Publisher : Springer Science & Business Media
Page : 328 pages
File Size : 48,5 Mb
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9789400709973
This volume presents selected papers from the IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow, convened in Princeton, NJ, USA, September I1-13, 2002. The behavior ofturbulence at high Reynolds number is interesting from a fundamental point of view, in that most theories of turbulence make very specific predictions in the limit of infinite Reynolds number. From a more practical point of view, there exist many applications that involve turbulent flow where the Reynolds numbers are extremely large. For example, large vehicles such as submarines and commercial transports operate at Reynolds 9 numbers based on length ofthe order oft0 , and industrial pipe flows cover a 7 very wide range of Reynolds numbers up to 10 • Many very important applications of high Reynolds number flow pertain to atmospheric and other geophysical flows where extremely high Reynolds numbers are the rule rather than the exception, and the understanding of climate changes and the prediction of destructive weather effects hinges to some extent on our appreciation ofhigh-Reynolds number turbulence behavior. The important effects of Reynolds number on turbulence has received a great deal of recent attention. The objective of the Symposium was to bring together many of the world's experts in this area to appraise the new experimental results, discuss new scaling laws and turbulence models, and to enhance our mutual understanding of turbulence.
Author : Stephen Jay Kline
Publisher : Unknown
Page : 60 pages
File Size : 41,9 Mb
Release : 1991
Category : Boundary layer
ISBN : UOM:39015095341205
Author : Jean-Paul Dussauge
Publisher : Unknown
Page : 88 pages
File Size : 42,6 Mb
Release : 1996
Category : Aerodynamics
ISBN : CORNELL:31924070129105
Author : National Research Council,Division on Engineering and Physical Sciences,Naval Studies Board,Bassin d'Essais des Carènes,Office of Naval Research
Publisher : National Academies Press
Page : 1024 pages
File Size : 41,8 Mb
Release : 2002-01-01
Category : Science
ISBN : 9780309254670
"Vive la Revolution!" was the theme of the Twenty-Third Symposium on Naval Hydrodynamics held in Val de Reuil, France, from September 17-22, 2000 as more than 140 experts in ship design, construction, and operation came together to exchange naval research developments. The forum encouraged both formal and informal discussion of presented papers, and the occasion provides an opportunity for direct communication between international peers. This book includes sixty-three papers presented at the symposium which was organized jointly by the Office of Naval Research, the National Research Council (Naval Studies Board), and the Bassin d'Essais des Carènes. This book includes the ten topical areas discussed at the symposium: wave-induced motions and loads, hydrodynamics in ship design, propulsor hydrodynamics and hydroacoustics, CFD validation, viscous ship hydrodynamics, cavitation and bubbly flow, wave hydrodynamics, wake dynamics, shallow water hydrodynamics, and fluid dynamics in the naval context.
Author : Anonim
Publisher : Unknown
Page : 704 pages
File Size : 44,9 Mb
Release : 1995
Category : Aeronautics
ISBN : UIUC:30112050127304
Author : Anonim
Publisher : Unknown
Page : 28 pages
File Size : 47,7 Mb
Release : 1978
Category : Electronic
ISBN : NASA:31769000540792
Author : D. Reguera,L.L. Bonilla,J.M. Rubi
Publisher : Springer
Page : 465 pages
File Size : 42,7 Mb
Release : 2008-01-11
Category : Computers
ISBN : 9783540446989
A rich variety of real-life physical problems which are still poorly understood are of a nonlinear nature. Examples include turbulence, granular flows, detonations and flame propagation, fracture dynamics, and a wealth of new biological and chemical phenomena which are being discovered. Particularly interesting among the manifestations of nonlinearity are coherent structures. This book contains reviews and contributions reporting on the state of the art regarding the role of coherent structures and patterns in nonlinear science.