The Flow Past Bluff Bodies By A Vortex Method
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The Flow Past Bluff Bodies By A Vortex Method
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Author : Andrew P. Burrows
language : en
Publisher:
Release Date : 1990
The Flow Past Bluff Bodies By A Vortex Method written by Andrew P. Burrows and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aerodynamics categories.
Computation Of Flow Past Single And Multiple Bluff Bodies By A Vortex Tracing Method
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Author : Woe-Chul Park
language : en
Publisher:
Release Date : 1989
Computation Of Flow Past Single And Multiple Bluff Bodies By A Vortex Tracing Method written by Woe-Chul Park 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.
Numerical Simulation Of The Viscous Flow Around Bluff Bodies Via The Random Vortex Method
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Author : Behzad Ghadiri Dehkordi
language : en
Publisher:
Release Date : 1993
Numerical Simulation Of The Viscous Flow Around Bluff Bodies Via The Random Vortex Method written by Behzad Ghadiri Dehkordi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
"The flow around multiple stationary cylinders is also simulated. Also, results are presented for the flow around two cylinders, one of which is forced to oscillate in a transverse direction. The numerical results of Strouhal number are in reasonable agreement with experiments." --
Flow Past Single Two Dimensional Bluff Bodies Of Various Geometries
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Author : Woe-Chul Park
language : en
Publisher:
Release Date : 1988
Flow Past Single Two Dimensional Bluff Bodies Of Various Geometries written by Woe-Chul Park and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Numerical Simulation Of The Viscous Flow Around Bluff Bodies Via The Random Vortex Method Microform
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Author : Behzad Ghadiri Dehkordi
language : en
Publisher: National Library of Canada = Bibliothèque nationale du Canada
Release Date : 1993
Numerical Simulation Of The Viscous Flow Around Bluff Bodies Via The Random Vortex Method Microform written by Behzad Ghadiri Dehkordi and has been published by National Library of Canada = Bibliothèque nationale du Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
"The flow around multiple stationary cylinders is also simulated. Also, results are presented for the flow around two cylinders, one of which is forced to oscillate in a transverse direction. The numerical results of Strouhal number are in reasonable agreement with experiments." --
An Investigation Of Flow Around Two Bluff Bodies In Tandem And Staggered Arrangements By The Discrete Vortex Method And Experiment
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Author : Hacı İbrahim Keser
language : en
Publisher:
Release Date : 1995
An Investigation Of Flow Around Two Bluff Bodies In Tandem And Staggered Arrangements By The Discrete Vortex Method And Experiment written by Hacı İbrahim Keser and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
Using an experimental-numerical integrated approach, flow around and mean pressure fields on a blunt-based flat plate and a downstream circular cylinder in tandem and staggered arrangements have been investigated. The investigation focuses on the effect of a wide range of horizontal and vertical spacings between the plate and the cylinder, on the flow and the associated mean pressure distributions. With different cross-stream length scales, and relatively thicker boundary layers of the upstTeam plate, the plate-cylinder arrangement offers a unique configuration that has not been disclosed before. The experimental part of the study reveals that, similar to that observed for equal diameter cylinders, which has received the most research attention in the related literature, a critical spacing exists. For horizontal spacings smaller than the critical, formation of vortices in front of the downstream cylinder is inhibited. However, flow configuration before the critical spacing is found to be drastically different than those for the circular cylinders. It has been demonstrated here that, the critical spacing of the tandem arrangement is valid for the staggered arrangements as well. That spacing marks the boundary of a region on either side of which different flow interferences take place for both tandem and the staggered arrangements. Experimental study also reveals the variation with respect to spacing of the mean pressure distributions on surfaces of the trailing-end of the plate. The experimental part provides not only a unique set of data, but also a basis for comparison for the numerical part of the study. In the numerical part, two different types of the discrete vortex method has been utilized. Firstly, an inviscid, Lagrangian approach allowed representation of boundary layers separated from the upstream plate by practically zero thickness rows of discrete vortices. The approach is original in combining the conformal-mapping image and the vortex-singularity-distribution techniques for representation of plate and the cylinder surfaces respectively. Secondly, a Lagrangian-Eulerian viscous discrete vortex method is used. Utilization of panel representation of body surfaces along with overlapping rectangular grids, allowed development of a computer code for laminar, two dimensional flow calculation around bodies of arbitrary geometry and number. Both parts of the numerical study could predict number of flow features, implied by the xnean pressure distributions in their experimental counterpart. With a realistic representation of the thick boundary layers of the plate, the viscous method I correctly predicted the experimentally found critical spacing, and, with its clear images of flow evolution, contributed significantly to the understanding of wake interference as function of the distance between the bodies. An extensive comparison of the measured and calculated mean distributions as function of the spacing was made. It has been shown that the drag force acting on the cylinder is primarily dependent on the pressure difference between both ends of the cylinder.
Control And Suppression Of Laminar Vortex Shedding Off Two Dimensional Bluff Bodies
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Author : Andre Sirilutporn Chan
language : en
Publisher:
Release Date : 2012
Control And Suppression Of Laminar Vortex Shedding Off Two Dimensional Bluff Bodies written by Andre Sirilutporn Chan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The focus of this research is on the control and suppression of vortex shedding of flow past bluff bodies. The motivation of this research stems from the aerodynamic problems encountered in the design and development of hard disk drives (HDD's). Two different computational fluid dynamic methods have been used in this research-- the Semi-Implicit Method for Pressure Linked Equation (SIMPLE), that is widely employed in today's commercial incompressible flow solvers, and the high-order spectral difference (SD) method, recently developed for compressible flow solution. In addition to numerical simulation and verification, complementary experimental measurements have been performed to further validate the results. This research leads to two very different suppression techniques: 1) a passive control using a thin splitter plate positioned downstream of the bluff body; 2) an active control by way of counter rotating a cylinder pair. The passive suppression technique places a thin splitter plate downstream of the bluff body in order to interfere with the vortex wakes and thereby suppress the vortexinduced forces on the bluff body itself. The present investigation examines the suppression of wake instabilities in the laminar shedding regime. Both bounded and unbounded flow conditions are examined. It is found that in the bounded flow condition, the channel walls have an additional stabilizing effect on the shedding control. With proper positioning of the splitter plate, vortex shedding is completely suppressed in a bounded flow with moderate blockage factor. Wind tunnel empirical experiments have also confirmed the effectiveness of a splitter plate in a bounded flow. Active flow control by counter-rotating a pair of cylinders has been numerically investigated. It has also been investigated experimentally in partnership with the Gas Dynamics Laboratory at Princeton University. It is demonstrated that it is possible to suppress unsteady vortex shedding for gap sizes from one to five cylinder diameters, at Reynolds numbers from 100 to 200. The degree of unsteady wake suppression is proportional to the speed and the direction of rotation, and there is a critical rotation rate where a complete suppression of flow unsteadiness can be achieved. In the doublet-like configuration at higher rotational speeds, a virtual elliptic body that resembles a potential doublet is formed, and the drag is reduced to zero. The shape of the elliptic body primarily depends on the gap between the two cylinders and the speed of rotation. Prior to the formation of the elliptic body, a second instability region is observed, similar to that seen in studies of rotating single cylinders. It is also shown that the unsteady wake suppression can be achieved by rotating each cylinder in the opposite direction, that is, in a reverse doublet-like configuration. This tends to minimize the wake interaction of the cylinder pair and the second instability did not make an appearance over the range of speeds investigated here.
Numerical Simulation Of Separated Flows Past Bluff Bodies
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Author : Andreas Neophytou Alexandrou
language : en
Publisher:
Release Date : 1987
Numerical Simulation Of Separated Flows Past Bluff Bodies written by Andreas Neophytou Alexandrou 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.
order interpolation scheme for the distribution of the vorticity at the nodal points than the bilinear (area) interpolation used in the original CIC method.
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.
Vortex Methods Selected Papers Of The First International Conference On Vortex Methods
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Author : Kyoji Kamemoto
language : en
Publisher: World Scientific
Release Date : 2000-05-11
Vortex Methods Selected Papers Of The First International Conference On Vortex Methods written by Kyoji Kamemoto and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-05-11 with Technology & Engineering categories.
Vortex methods have been developed and applied to many kinds of flows related to various problems in wide engineering and scientific fields. The purpose of the First International conference on Vortex methods was to provide an opportunity for engineers and scientists to present their achievements, exchange ideas and discuss new developments in mathematical and physical modeling techniques and engineering applications of vortex methods.
