The Near Wall Mechanics Of Three Dimensional Turbulent Boundary Layers PDF Download
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Author | : Olav Sendstad |
Publisher | : |
Total Pages | : 146 |
Release | : 1992 |
Genre | : |
ISBN | : |
Download The Near Wall Mechanics of Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : O. Sendstad |
Publisher | : |
Total Pages | : 130 |
Release | : 1992 |
Genre | : Simulation methods |
ISBN | : |
Download Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 127 |
Release | : 1993 |
Genre | : |
ISBN | : |
Download Three-Dimensional Turbulent Boundary Layer Book in PDF, ePub and Kindle
The near wall mechanics of 3D turbulent boundary layers were studied using direct numerical simulation. A fully developed turbulent channel flow was suddenly subjected to a transverse pressure gradient. An explanation for the reduction in the Reynolds stresses, observed in experiments, was provided in terms of the dynamics of near-wall streamwise vortices in turbulent boundary layers was described. It was shown that the effect of three-dimensionality is to change the trajectory of fluid particles in the vicinity of these vortices, and how this change leads to reductions of turbulence stresses. The proposed mechanisms are consistent with numerous statistical data and correlations which are presented. Turbulence, Boundary layers, Simulation.
Author | : Debora Alice Compton |
Publisher | : |
Total Pages | : 222 |
Release | : 1995 |
Genre | : |
ISBN | : |
Download Near-wall Measurements of a Three-dimensional Turbulent Boundary Layer Book in PDF, ePub and Kindle
In order to improve predictions of flow behavior in numerous applications there is a great need to understand the physics of three-dimensional turbulent boundary layers, dominated by near-wall behavior. To that end, an experiment was performed to measure near-wall velocity and Reynolds stress profiles in a pressure-driven three-dimensional turbulent boundary layer. The flow was achieved by placing a 30 deg wedge in a straight duct in a wind tunnel, with-additional pressure gradient control above the test surface. An initially two-dimensional boundary layer (Re approx. equal 4000) was exposed to a strong spanwise pressure gradient. At the furthest downstream measurement locations there was also a fairly strong favorable pressure gradient. Measurements were made using a specially-designed near-wall laser Doppler anemometer (LDA), in addition to conventional methods. The LDA used short focal length optics, a mirror probe suspended in the flow, and side-scatter collection to achieve a nearly spherical measuring volume approximately 35 microns in diameter. Good agreement with previous two-dimensional boundary layer data was achieved. The three-dimensional turbulent boundary layer data presented include mean velocity measurements and Reynolds stresses, all extending well below y(+) = 10, at several profile locations. Terms of the Reynolds stress transport equations are calculated at two profile locations. The mean flow is nearly collateral at the wall. Turbulent kinetic energy is mildly suppressed in the near-wall region and the shear stress components are strongly affected by three-dimensionality. As a result, the ratio of shear stress to turbulent kinetic energy is suppressed throughout most of the boundary layer. The angles of stress and strain are misaligned, except very near the wall (around y(+) = 10) where the angles nearly coincide with the mean flow angle.
Author | : J. P. Johnston |
Publisher | : |
Total Pages | : 62 |
Release | : 1976 |
Genre | : Boundary layer |
ISBN | : |
Download Experimental Studies in Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
The various methods for measurement of the six components of the turbulence stress tensor are reviewed, and some of the data on the turbulent shear stress vector are presented to demonstrate the validity of current ideas for.
Author | : H. Fernholz |
Publisher | : Springer |
Total Pages | : 416 |
Release | : 1982-09 |
Genre | : Science |
ISBN | : |
Download Three-Dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
The IUTAM Symposium on Three-dimensional Turbulent Boundary Layers was suggested by the Gesellschaft für Angewandte Mathe matik (GAMM) and sponsored by the International Union of theor etical and Applied Mechanics. The symposium was organized by H.H. Fernholz (Hermann-Föttinger-Institut für Thermo- und Fluiddynamik der Technischen Universität Berlin) and E. Krause (Aerodynamisches Institut der RWTH Aachen). After two success ful Euromech Colloquia on the same topic in Berlin 1972 and Trondheim 1975 the organizers felt that another meeting should be convened, this time with participants from inside and out side Europe. The aim of the symposium has been to bring together scientists who are actively engaged in boundary layer research, both ex perimental and theoretical. The scope of the meeting encompass ed incompressible and compressible three-dimensional turbulent boundary layers. Special emphasis was laid on economical cal culation methods, on measurements of fluctuating quantities and on measuring techniques designed for and applied success fully to three-dimensional boundary layers. From among thirty-four papers submitted for presentation, twenty six contributions of twenty-five minutes each were selected by the European mernbers of the Scientific Committee. Furthermore there were four invited lectures of forty-five minutes. Short discussions were held directly after each presentation with a long discussion period at the end of each day. The final dis cussion on the last day of the symposium was recorded on tape and is presented in a slightly shortened version as the last contribution in this volume.
Author | : Stanford University. Thermosciences Division. Thermosciences Division |
Publisher | : |
Total Pages | : 46 |
Release | : 1994 |
Genre | : |
ISBN | : |
Download Advances in Three-dimensional Turbulent Boundary Layers with Emphasis on the Wall-layer Regions Book in PDF, ePub and Kindle
Author | : Karen Ashby Flack |
Publisher | : |
Total Pages | : 242 |
Release | : 1993 |
Genre | : |
ISBN | : |
Download Near-wall Investigation of Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : Daniel John Krommenhoek |
Publisher | : |
Total Pages | : 194 |
Release | : 1968 |
Genre | : Boundary layer |
ISBN | : |
Download Local Wall Shear Stress in Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : Mark Harris Tennant |
Publisher | : |
Total Pages | : 786 |
Release | : 1977 |
Genre | : |
ISBN | : |
Download Near-wall Similarity in Three-dimensional Turbulent Boundary Layers Book in PDF, ePub and Kindle