Some Effects Of Turbulence On The Flow Around Bluff Bodies
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Some Effects Of Turbulence On The Flow Around Bluff Bodies
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Author : P.W. Bearman
language : en
Publisher:
Release Date : 1968
Some Effects Of Turbulence On The Flow Around Bluff Bodies written by P.W. Bearman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with categories.
Turbulent Flow Around Bluff Bodies At The Floodplain Edge
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Author : Fiona Heatlie
language : en
Publisher:
Release Date : 2010
Turbulent Flow Around Bluff Bodies At The Floodplain Edge written by Fiona Heatlie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
This thesis examines the flow around bluff bodies placed at the floodplain edge in a compound, open channel. The floodplain edge location is associated with a strong shear layer between lower velocity floodplain flow and high velocity flow in the main channel. The drag force exerted by a bluff body is dependant on the way in which the flow separates around the body and subsequently recovers but the drag coefficients typically used to represent the effects of bluff bodies are based on experiments on bodies in geometrically simple channels. The differences induced in the wake structures and therefore in the drag coefficients of bluff bodies when they are placed in the shear layer at the floodplain edge are little understood. In this study, experimental data is gathered that allows direct comparison of the wakes of identical bluff bodies, both emergent (surface-piercing) and submerged, in simple and compound open channels. For the compound channel scenarios, for both single and multiple block arrangements, turbulence data is also reported. These results are augmented using a computational model based on the solution of the 3D Reynolds Averaged Navier Stokes equations, using a non-linear turbulence model. The results show that the changes induced in the wake structures due to their location at the floodplain edge of the compound channel can have a significant effect on the drag coefficient. For the emergent bodies, the proximity of the deep main channel flow is shown to impact in a complex manner upon the processes of reattachment and re-separation, changing the formation of vorticity in the wake. For the submerged bodies, this is complicated by asymmetry in the same processes on the block top. For both body types, separation on the main channel side results in the creation of a strong axial circulation at the floodplain edge and the decay of the wake is asymmetrically affected by the differing behaviour of the turbulence on the two sides.
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.
Bluff Body Aerodynamics And Its Applications
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Author : Manabu Ito
language : en
Publisher: Elsevier Publishing Company
Release Date : 1990
Bluff Body Aerodynamics And Its Applications written by Manabu Ito and has been published by Elsevier Publishing Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Technology & Engineering categories.
With the increasing slenderness and lightness of civil engineering structures such as tower blocks and bridges, wind effects on them have been attracting considerable interest from researchers and design engineers. Since most structures in civil engineering present bluff forms to the wind, the main emphasis of this collection of papers is on bluff body aerodynamics. The flow effects in this case, in addition to turbulence effects in the atmospheric boundary layer illustrate the unique and complex nature of the problems that can be encountered in this field, as opposed to the classical studies in the aeronautical field that influenced the initial development stages of industrial aerodynamics. Selected papers from the colloquium are presented in this volume. The papers offer a comprehensive presentation of the results of the studies made of wind effects on engineering structures. The latest trends in the field are outlined and the results obtained in the solution of topical problems are described.
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.
Twenty First Symposium On Naval Hydrodynamics
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 1997-09-11
Twenty First Symposium On Naval Hydrodynamics written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-09-11 with Science categories.
Some Secret Measurements Of The Flow Around Bluff Bodies In Smooth And Turbulent Streams
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Author : P. W. Bearman
language : en
Publisher:
Release Date : 1972
Some Secret Measurements Of The Flow Around Bluff Bodies In Smooth And Turbulent Streams written by P. W. Bearman 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.
Effects Of Flow Control On Flow Past Bluff Bodies
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Author : Aditya Mushyam
language : en
Publisher:
Release Date : 2016
Effects Of Flow Control On Flow Past Bluff Bodies written by Aditya Mushyam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The aim of this Ph.D. thesis, "Effects of flow control on flow past bluff bodies" is to study and analyzes the effects of Flow Control on various aspects and proverbs of flow past bluff bodies. Flow control techniques are presently researched and studied across the world to gauge their effectiveness in altering flow properties and patterns in different flow scenarios. The inspiration for the present work is derived from automobile industry, as analyzing the flow over backward step and inclined step shall help in understanding the characteristics of the rear vehicle wake. Since a considerable percentage of the energy needed to propel the vehicle is dissipated by the vorticity generated in the rear of the vehicle, hence it is of utmost importance to understand the properties of the wake. In the present study various possibilities were explored for application and examine effectiveness of active flow control techniques in bluff bodies to increase the aerodynamic efficiency. The primary aim of the study is to reduce the drag acting on bluff bodies by determining an effective active flow control technique and configuration. Two different kinds of Active Flow Control techniques have been used in this thesis namely, "Zero Net Mass Flow Actuator" and "Fluidic Actuator". The characteristics of laminar and turbulent boundary layer were analyzed and the effectiveness of flow control in delaying the detachment of the boundary layer was analyzed. Numerical simulation programs were developed in C language for simulating various cases in the thesis and a 3D LES turbulence modeling finite volume code was developed using Smagorinsky-Lilly model in C language for the simulating the flow over backward step in turbulence regime. All the numerical simulation codas were validated with previous research works. The thesis is divided into five chapters analyzing flow over square cylinder, backward step and inclined step geometries in 2D and 3D in laminar and turbulent regimes.
The Effect Of A Locally Forced Periodic Excitation On The Drag Coefficient For A Bluff Body In Turbulent Flow
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Author : Daniel Christopher Alanko
language : en
Publisher:
Release Date : 2004
The Effect Of A Locally Forced Periodic Excitation On The Drag Coefficient For A Bluff Body In Turbulent Flow written by Daniel Christopher Alanko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Air flow categories.
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.
