Visualization Of Flow Around Bluff Bodies

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Visualization Of Flow Around Bluff Bodies

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Author : Khaled Mohamed Elsherbini
language : en
Publisher:
Release Date : 1995

Visualization Of Flow Around Bluff Bodies written by Khaled Mohamed Elsherbini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Flow visualization categories.

Flow Visualization And Wake Analysis For Complex Three Dimensional Bluff Bodies At Subcritical Through Critical Reynolds Numbers

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Author : J. Small
language : en
Publisher:
Release Date : 1992

Flow Visualization And Wake Analysis For Complex Three Dimensional Bluff Bodies At Subcritical Through Critical Reynolds Numbers written by J. Small and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.

Flow Visualization Techniques For The Study Of The Aerodynamics Of Bluff Bodies And Of Unsteady Flows

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Author : Andrew A. Fejer
language : en
Publisher:
Release Date : 1972

Flow Visualization Techniques For The Study Of The Aerodynamics Of Bluff Bodies And Of Unsteady Flows written by Andrew A. Fejer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.

Existing flow visualization techniques are considered which are relevant to the study of wind effects on fluff bodies. A number of these are described in some detail; in particular, smoke filaments, dye streaks, wall tracers, hydrogen bubbles and tufts. Representative examples of the application of these techniques are presented. The paper has been prepared for presentation in a 1972 lecture series on wind effects on buildings and structures held at the Von Karman Institute, Rhode-St.-Genese. (Author Modified Abstract).

Vortex Induced Vibrations

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Author : Vijay Matheswaran
language : en
Publisher:
Release Date : 2022

Vortex Induced Vibrations written by Vijay Matheswaran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Electronic dissertations categories.

Vortex shedding and Vortex Induced Vibrations (VIV) of bluff bodies is a fundamental problem in fluid mechanics. The ubiquity of vortex shedding and VIV in several engineering fields has meant that a significant amount of research has centered on this subject. Recent studies have focused on the extraction of energy from steady flow using bodies undergoing VIV. In this dissertation, a new model for flow around a circular cylinder called the Hybrid Potential Flow (HPF) model is presented. The HPF model incorporates potential flow methods, experimental data and von Karman’s representation of the vortex wake to construct a complete solution for flow around a circular cylinder in the sub-critical Reynolds number regime $300 \leq Re \leq 1.5 x 10^5).$ Shedding frequencies and forces due to vortex shedding are calculated and compared to published results. The HPF model is extended to other bluff body geometries using conformal mapping. A composition of Karman-Trefftz transformations and Fornberg’s method is used to construct a conformal map between the physical domain and the circle plane. The combination of the HPF model and conformal mapping can thus be used to quickly calculate vortex shedding behavior for various bluff bodies. Validation of theoretical results is done through experimental methods. A flow visualization technique to view the time-averaged wake behind bluff bodies is developed and presented. Wind tunnel tests are done to validate predicted shedding frequencies for various bluff body geometries. A proof-of-concept prototype of a device that extracts energy from steady flow using VIV is developed. Emphasis is laid on the device being of low cost and complexity. Finally, principal conclusions of this dissertation and recommendations for future work are presented.

Turbulence Effects On The Flow And Pressure Distributions Around Three Dimensional Bluff Bodies

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Author : Mohamed K. Sitheeq
language : en
Publisher:
Release Date : 1997

Turbulence Effects On The Flow And Pressure Distributions Around Three Dimensional Bluff Bodies written by Mohamed K. Sitheeq and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.

Flow Visualization

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Author : Alexander J. Smits
language : en
Publisher: World Scientific
Release Date : 2012

Flow Visualization written by Alexander J. Smits and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Technology & Engineering categories.

This is the 2nd edition of the book, Flow Visualization: Techniques and Examples, which was published by Imperial College Press in 2000. Many of the chapters have been revised and updated to take into consideration recent changes in a number of flow visualization and measurement techniques, including an updated high quality flow gallery. Unique among similar publications, this book focuses on the practical rather than theoretical aspects. Obtaining high quality flow visualization results is, in many ways, more of an art than a science, and experience plays a key deciding role. The depth and breadth of the material will make this book invaluable to readers of all levels of experience in the field.

Bluff Body Wakes Dynamics And Instabilities

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Author : Helmut Eckelmann
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11

Bluff Body Wakes Dynamics And Instabilities written by Helmut Eckelmann 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 2013-11-11 with Science categories.

Bluff-body wakes play an important role in many fluid dynamics problems and engineering applications. This book gives and up-to-date account of recent results obtained in the study of bluff-body wakes. Experimental, theoretical and numerical approaches are all comprehensively covered and compared. Topics of particular interest include hydrodynamic instability analyses, three-dimensional pattern formation problems, flow control methods, bifurcation analyses, numerical simulations and turbulence modelling. The main originality of thisvolume is that recent conceptual advances made to describe nonlinear phenomena in general are put to the test on a classical problem in fundamental fluid mechanics, namely the wake structure generated behind a bluff object.

Visualisation Of The Surface Flow Pattern On A Vehicle Like Bluff Body

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Author : Pia Landby
language : en
Publisher:
Release Date : 1989

Visualisation Of The Surface Flow Pattern On A Vehicle Like Bluff Body written by Pia Landby and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

Turbulent Flow Around Bluff Bodies

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Author : H.G. Regeer
language : en
Publisher:
Release Date : 1996

Turbulent Flow Around Bluff Bodies written by H.G. Regeer 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.

Visualization Study Of Vorticity Amplification In Stagnation Flow

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Author : Willy Z.. Sadeh
language : en
Publisher:
Release Date : 1977

Visualization Study Of Vorticity Amplification In Stagnation Flow written by Willy Z.. Sadeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Turbulence categories.

A visualization study of stagnation flow round a circular cylinder was carried out in order to gain a physical insight into its model put forward by the vorticity-amplification theory. The visualization was conducted at a Reynolds number of 8000 utilizing white smoke composed of titanium dioxide for an approaching flow containing turbulence at scales larger than the neutral wavelength. An in-depth dynamic qualitative apperception of the flow events was obtained by means of motion pictures taken from three different viewpoints. In addition, a frame by frame examination of selected movie strips led to the acquisition of a reasonably quantitative interpretation of the gross flow structure. The analysis of the flow events focused on tracing the temporal and spatial evolution of a cross-vortex tube outlined by the entrained smoke filaments. The visualization supplied striking evidence concerning: (1) the selective stretching of cross-vortex tubes which is responsible for the amplification of vorticity and, hence, of turbulence; (2) the streamwise tilting of stretched cross-vortex tubes; (3) the existence of a coherent array of vortices near the stagnation zone; (4) the interaction of the amplified vorticity with the body laminar boundary layer; and, finally, (5) the growth of a turbulent boundary layer. These are basically the flow characteristics and events advanced by the vorticity-amplification theory. It is thus apparent that the amplification of turbulence in stagnation flow around a bluff body and its effects upon the body boundary layer are satisfactorily explained by the vorticity-amplification theory. (Author).