Three Dimensional Turbulent Flow Research

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Three Dimensional Turbulent Flow Research

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Author : F. J. Pierce
language : en
Publisher:
Release Date : 1975

Three Dimensional Turbulent Flow Research written by F. J. Pierce and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.

This is a final summary report on basic research in the three-dimensional turbulent flow problem area. Research in pressure driven skewed boundary layer flows included direct force measurement of local wall shear stress, mean velocity and Reynolds stress measurements in a rectangular curved channel boundary layer and in an unconfined boundary layer, and numerical solutions of both the momentum integral and motion forms of the governing equations.

Fluid Dynamics Of Three Dimensional Turbulent Shear Flows And Transition

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Author :
language : en
Publisher:
Release Date : 1989

Fluid Dynamics Of Three Dimensional Turbulent Shear Flows And Transition written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Boundary layer categories.

The AGARD Fluid Dynamics Panel sponsored this Symposium to determine the trends and achievements of current research activities in 3D turbulent shear flows and transition and to highlight the problems on which future research should be focused. The Symposium included seven sessions devoted to the topic of transition, and these sessions well represented the current state of the art. The characteristics of three dimensional turbulent shear flows were dealt with in five sessions, a reflection of the fact that here much more experimental work is needed, and the effort devoted to this difficult topic has not yet reached the level required. However, the Symposium served to define the main areas calling for future research, and it should be very helpful in stimulating the work needed.

Prediction Of Three Dimensional Turbulent Flow With An Embedded Vortex

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Author : Ayşe Nazan Akman
language : en
Publisher:
Release Date : 1999

Prediction Of Three Dimensional Turbulent Flow With An Embedded Vortex written by Ayşe Nazan Akman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

In this study, three dimensional incompressible turbulent slender flow is solved by Parabolised Navier-Stokes equations using a streamwise marching computer codewhich uses ADI methods for the solution of velocities and iteration techniques for thesolution of pressure and turbulent quantities. A review of the existing turbulencemodels is made and the most up-to-date turbulence model, Reynolds stress Turbulence Model (RSTM) is utilized in the computations. Staggered grid, which incorporates history effects to a degree, is preferred for storing velocities and pressurel turbulence quantities at different nodes both in the crossflow and treamwise directions. Central differencing schemes are used most of the time; however when it enhances the solutions forward differencing schemes are also used. The results are presented in a separate chapter for the different test cases tried with the computer code. The objective of this work is to predict three-d.imensional turbulent flow with an embedded vortex. For this reason, three casesare tested with the code: Laminar flow over a flat plate, turbulent flow over a flatpJate and an embedded common flow-up vortex in a boundary Iayer. The Iast caseis a verification of an experimental data set. it is seen that the results of the first twocases are satisfactory. The results of the third case captures the general motion however, at some points, it is seen that the RSTM is unable to verify theexperimental results.

Near Wall Investigation Of Three Dimensional Turbulent Boundary Layers

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Author :
language : en
Publisher:
Release Date : 2001

Near Wall Investigation Of Three Dimensional Turbulent Boundary Layers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

This report documents the experimental study for four different three-dimensional turbulent flows. The investigation focuses on near wall measurements in these flows. Several experimental techniques are used in the studies; however, the bulk of the investigation focuses on a three-orthogonal-velocity-component fiber-optic laser Doppler anemometer (3D-LDA) system. The control volume of the 3D-LDA is on the order of 50 micro-meter in size, or a y+ distance of around 2.3 units (using average values of U? and? from the experiment). An auxiliary small boundary layer wind tunnel (auxiliary tunnel) and a low speed linear compressor cascade wind tunnel (cascade tunnel) are utilized in this study. One of four flow experiments is done in the auxiliary tunnel the other three are in the cascade tunnel. The first three-dimensional turbulent flow is a vortical flow created by two half-delta wing vortex generators. Near wall secondary flow features are found. The second flow is an investigation of the first quarter chord tip gap flow in the cascade tunnel. Strong three-dimensional phenomena are found. The third flow investigated is the inflow to the compressor cascade with the moving wall. The experiment records shear layer interaction between the upstream flow and moving wall. Finally the fourth flow investigated is the inflow to the compressor cascade with the moving wall with half-delta wing vortex generators attached. Phase-averaged data reveal asymmetrical vortex structures just downstream of thevortex generators. This is the first time any near wall data has been taken on any of these flows.

Experimental Studies In Three Dimensional Turbulent Boundary Layers

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Author : J. P. Johnston
language : en
Publisher:
Release Date : 1976

Experimental Studies In Three Dimensional Turbulent Boundary Layers written by J. P. Johnston and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Boundary layer categories.

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.

A Streamline Iteration Method For Computing The Three Dimensional Turbulent Flow Around The Stern And In The Wake Of Ship

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Author : Shan Huang
language : en
Publisher:
Release Date : 1986

A Streamline Iteration Method For Computing The Three Dimensional Turbulent Flow Around The Stern And In The Wake Of Ship written by Shan Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Hydrodynamics categories.

Numerical Study Of Three Dimensional Turbulent Flows

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Author :
language : en
Publisher:
Release Date : 2001

Numerical Study Of Three Dimensional Turbulent Flows written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Direct numerical and large-eddy simulations were used to perform numerical experiments' relevant to the cases of interest. We employ a plane-channel geometry and impose mean-flow perturbations by subjecung fully developed 2D Poiseuille flow to irrotational deformations andlor in-plane motion of the channel walls. The former corresponds to outer-layer strains induced in boundary layers by pressure gradients, the latter to sudden variations in the near-wall region, caused by either step changes in the surface conditions or the combination of an outer-layer change and the no-slip boundary condition. This combination allows the physics of a broad class of spatially developing wall shear layers to be duplicated with a temporally evolving channel flow. The temporal computations can be realized much more effectively than can simulations of a spatial boundary layer. providing a much more extensive study for a given cost. As a consequence. we can consider a wide variety of mean-flow perturbations. Moreover, since mean statistics for these flows satisfy a one dimensional unsteady problem that contains the essential features of the spatial flow, they provide an effident means of testing on%point dosure models.

Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations

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Author : R. C. Buggeln
language : en
Publisher:
Release Date : 1980

Computation Of Laminar And Turbulent Flow In Curved Ducts Channels And Pipes Using The Navier Stokes Equations written by R. C. Buggeln and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Laminar flow categories.

Both laminar and turbulent flows in strongly curved ducts, channels, and pipes are studied by numerical methods. The study concentrates on the curved square-duct geometry and flow conditions for which detailed measurements have been obtained recently by Taylor, Whitelaw, and Yianneskis. The solution methodology encompasses solution of the compressible ensemble-averaged Navier-Stokes equations at low Mach number using a split linearized block implicit (LBI) scheme, and rapid convergence on the order of 80 noniterative time steps is obtained. The treatment of turbulent flows includes resolution of the viscous sublayer region. A series of solutions for both laminar and turbulent flow and for both two- and three-dimensional geometries of the same curvature are presented. The accuracy of these solutions is explored by mesh refinement and by comparison with experiment. In summary, good qualitative and reasonable quantitative agreement between solution and experiment is obtained. Collectively, this sequence of results serves to clarify the physical structure of these flows and hence how grid selection procedures might be adjusted to improve the numerical accuracy and experimental agreement. For a three-dimensional flow of considerable complexity, the relatively good agreement with experiment obtained for the turbulent flow case despite a coarse grid must be regarded as encouraging. (Author).

Instability Transition And Turbulence

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Author : M.Y. Hussaini
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Instability Transition And Turbulence written by M.Y. Hussaini and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

This volume contains the proceedings of the Workshop on In stability, Transition and Turbulence, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the NASA Langley Research Center (LaRC), during July 8 to August 2, 1991. This is the second workshop in the series on the subject. The first was held in 1989, and its proceedings were published by Springer-Verlag under the title "Instability and Transition" edited by M. Y. Hussaini and R. G. Voigt. The objectives of these work shops are to i) expose the academic community to current technologically im portant issues of transition and turbulence in shear flows over the entire speed range, ii) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these capabilities, and iii) accelerate progress in elucidating the fundamental phenomena of transition and turbulence, leading to improved transition and turbulence modeling in design methodologies. The research areas covered in these proceedings include receptiv ity and roughness, nonlinear theories of transition, numerical simu lation of spatially evolving flows, modelling of transitional and fully turbulent flows as well as some experiments on instability and tran sition. In addition a one-day mini-symposium was held to discuss 1 recent and planned experiments on turbulent flow over a backward facing step.

Three Dimensional Turbulent Boundary Layers

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Author : H. Fernholz
language : en
Publisher: Springer
Release Date : 1982-09

Three Dimensional Turbulent Boundary Layers written by H. Fernholz and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982-09 with Science categories.

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.