An Investigation Of Flow Around Two Bluff Bodies In Tandem And Staggered Arrangements By The Discrete Vortex Method And Experiment
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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.
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 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." --
Japanese Technical Abstracts
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Author :
language : en
Publisher:
Release Date : 1988
Japanese Technical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Engineering categories.
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.
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." --
Research On Bluff Body Vortex Wakes
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Author :
language : en
Publisher:
Release Date : 1995
Research On Bluff Body Vortex Wakes 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 categories.
Comparison of laboratory experiments and computational results for two dimensional flows showed that, in impulsively started flows, laboratory flows are two dimensional in the early stages and that three dimensional effects develop after acceleration is complete. In fully developed flow the mean and fluctuating forces are considerably lower (up to 50%) in the laboratory flows (ie with three dimensionality) than in the two dimensional numerical simulations. The experiments in tow tank and water tunnel also revealed the existence of long-time modulations of vortex shedding forces. These have the form of bursts with duration of order 10 vortex shedding periods. A novel method of introducing controlled spanwise components of velocity into otherwise two dimensional flow, at low Reynolds number was to give the cylinder an axial (spanwise) motion, either a steady translation or a periodic oscillation. For unsteady, periodic axial oscillation of the cylinder, the experiments showed how the ratio of the spanwise period to the vortex shedding period determines the patterns of vortex dislocation in the wake, how regimes of chaos are formed and how shedding frequency and wake spectra are affected. (AN).
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.
Unsteady And Separated Flows
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Author :
language : en
Publisher:
Release Date : 1992
Unsteady And Separated 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 1992 with categories.
In these investigations, simple geometries were studied. Experiments and simulations examined the addition of unsteady motions, of flat plates inclined normal to the flow, and circular cylinders, to the conventional-steady motions of these bodies. The simulations also investigated the (three-dimensional) interactions of vortex rings and the startup flow of a square flat plate oriented normal to the direction of motion (bluff body configuration). Laboratory experiments and measurements on flow past flat plates nominally normal to the direction of motion were performed. The objectives of this research were to elucidate the dynamics of large vortical structure in globally steady and unsteady separated flows, and to develop techniques to modify their behavior and control them for desired effect. In-line accelerations and transverse oscillations of flat plates were evaluated to modify the flow structure. These investigations examined the behavior of the large vortical structures in the resulting unsteady and separated flow, and the associated forces on the flat plate. Vortex methods were used to study two- and three-dimensional flows. The objectives of this research were to develop methods to examine the large-scale separated vortices in the wake of bluff bodies, study the influence of transient motions of the body on these dynamics, and investigate control strategies to produce desired effects.
Vortex Shedding From Two Rectangular Bluff Bodies In Tandem
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Author : Anthony Richard Nichols
language : en
Publisher:
Release Date : 1988
Vortex Shedding From Two Rectangular Bluff Bodies In Tandem written by Anthony Richard Nichols and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Vortex-motion categories.
