The Near Wall Mechanics of Three-dimensional Turbulent Boundary Layers PDF Download
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Author: Olav Sendstad
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Book Description
Author: Olav Sendstad
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
Get Book Here
Book Description
Author: O. Sendstad
Publisher:
ISBN:
Category : Simulation methods
Languages : en
Pages : 130
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 127
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Book Description
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: J. P. Johnston
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 62
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Book Description
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
ISBN:
Category : Science
Languages : en
Pages : 416
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Book Description
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:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
Author: Karen Ashby Flack
Publisher:
ISBN:
Category :
Languages : en
Pages : 242
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Book Description
Author: Daniel John Krommenhoek
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 194
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Book Description
Author: Mark Harris Tennant
Publisher:
ISBN:
Category :
Languages : en
Pages : 786
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Book Description
Author: A.V. Boiko
Publisher: Springer Science & Business Media
ISBN: 9783540421818
Category : Science
Languages : en
Pages : 286
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Book Description
This book presents a comprehensive survey of the origin of turbulence in near-wall shear layer flows. Instead of going too far into details modern approaches to the problem are discussed in a conceptual treatment. The transition from laminar to turbulent flows in shear layers is described including the generation of flow perturbations, their amplification and development, the breakdown of the initial laminar state, and transformation to a turbulent regime. This book also presents new approaches to boundary-layer transitions with strong external-flow perturbations and to the prediction and control of the presented near-wall transitions to turbulence. This book is addressed to researchers, lecturers and students in engineering, physics and mathematics.
