Prediction Of Three Dimensional Turbulent Flow With An Embedded Vortex

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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.

Three Dimensional Compressible Turbulent Flow Computations For A Diffusing S Duct With Without Vortex Generators

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Author : Soo-Yong Cho
language : en
Publisher:
Release Date : 1994

Three Dimensional Compressible Turbulent Flow Computations For A Diffusing S Duct With Without Vortex Generators written by Soo-Yong Cho and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Turbulent Flow Over An Embedded Rectangular Cavity

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Author : George D. Catalano
language : en
Publisher:
Release Date : 1987

Turbulent Flow Over An Embedded Rectangular Cavity written by George D. Catalano and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.

A numerical, discrete vortex model is developed for flow over an embedded rectangular cavity, with the separation of the shear layer at the leading edge replaced by periodic insertion of point vortices. The results of the vortex model are compared to the data obtained from an experimental investigation carried out at a free stream speed of 6 m/sec past a rectangular cavity of depth, D equal to 5 cm; a depth-to-width ratio, D/W equal to 1.0 and length-to-depth ratio, L/D, equal to 4.0. The Reynolds numbers based on the cavity depth is approximately 2x 104. Mean velocity, and turbulent intensity, profiles are presented. Evidence of the three dimensional nature of the flow has been obtained via oil film and tuft flow visualization techniques. Discrepancies between the model predictions and the experimental results are discussed as are differences between the 3-D flow field examined here and previous infinite span, 2-D, cavity configurations. Additionally, a mechanism is developed for the inclusion in the vortex model of various initial separation conditions.

Mean Flow Development Of A Longitudinal Vortex Embedded In An Attached Three Dimensional Turbulent Boundary Layer

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Author :
language : en
Publisher:
Release Date : 1990

Mean Flow Development Of A Longitudinal Vortex Embedded In An Attached Three Dimensional Turbulent Boundary Layer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.

Prediction Of Turbulent Flows

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Author : Geoff Hewitt
language : en
Publisher: Cambridge University Press
Release Date : 2005-06-08

Prediction Of Turbulent Flows written by Geoff Hewitt and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-06-08 with Mathematics categories.

The prediction of turbulent flows is of paramount importance in the development of complex engineering systems involving flow, heat and mass transfer, and chemical reactions. Arising from a programme held at the Isaac Newton Institute in Cambridge, this volume reviews the current situation regarding the prediction of such flows through the use of modern computational fluid dynamics techniques, and attempts to address the inherent problem of modelling turbulence. In particular, the current physical understanding of such flows is summarised and the resulting implications for simulation discussed. The volume continues by surveying current approximation methods whilst discussing their applicability to industrial problems. This major work concludes by providing a specific set of guidelines for selecting the most appropriate model for a given problem. Unique in its breadth and critical approach, this book will be of immense value to experienced practitioners and researchers, continuing the UK's strong tradition in fluid dynamics.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.

Turbulent Flow

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Author : Peter S. Bernard
language : en
Publisher: John Wiley & Sons
Release Date : 2002-08-19

Turbulent Flow written by Peter S. Bernard and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-08-19 with Science categories.

Provides unique coverage of the prediction and experimentation necessary for making predictions. * Covers computational fluid dynamics and its relationship to direct numerical simulation used throughout the industry. * Covers vortex methods developed to calculate and evaluate turbulent flows. * Includes chapters on the state-of-the-art applications of research such as control of turbulence.

Prediction Of Two And Three Dimensional Turbulent Flows

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Author : Othman A. Karim
language : en
Publisher:
Release Date : 1996

Prediction Of Two And Three Dimensional Turbulent Flows written by Othman A. Karim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

The Prediction Of The Three Dimensional Turbulent Flow Field In A Flow Splitting Tee Junction

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Author :
language : en
Publisher:
Release Date : 1977

The Prediction Of The Three Dimensional Turbulent Flow Field In A Flow Splitting Tee Junction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.

Prediction Of Transonic Vortex Flows Using Linear And Nonlinear Turbulent Eddy Viscosity Models

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Author : Robert E. Bartels
language : en
Publisher:
Release Date : 2000

Prediction Of Transonic Vortex Flows Using Linear And Nonlinear Turbulent Eddy Viscosity Models written by Robert E. Bartels and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Aerodynamics, Transonic categories.

Threee-dimensional transonic flow over a delta wing is investigated with a focus on the effect of transition and influence of turbulence stress anisotropies. The performance of linear eddy viscosity models and an explicit algebraic stress model is assessed at the start of the vortex flow, and the results compared with experimental data. To assess the effect of transition location, computations that either fix transition or are fully turbulent are performed. To assess the effect of the turbulent stress ansiotropy, comparisons are made between predictions from the algebraic stress model and the linear eddy viscosity models. Both transition location and turbulent stress anisotropy significantly affect the 3D flow field. The most significant effect is found to be the modeling of transition location. At a Mach number of 0.90, the computed solution changes character from steady to unsteady depending on transition onset. Accounting for the anisotropies in the turbulent stresses also considerably impacts the flow, most notably in the outboard region of flow separation.