Experimental Investigation Of Unsteady Wake Structure Of Bluff Bodies
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Experimental Investigation Of Unsteady Wake Structure Of Bluff Bodies
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Author : Mostafa Rahimpour
language : en
Publisher:
Release Date : 2020
Experimental Investigation Of Unsteady Wake Structure Of Bluff Bodies written by Mostafa Rahimpour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Experimental Investigation Of Unsteady Near Wakes Of Ground Vehicle Bodies
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Author : Edward Gregg Duell
language : en
Publisher:
Release Date : 1994
Experimental Investigation Of Unsteady Near Wakes Of Ground Vehicle Bodies written by Edward Gregg Duell 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.
Experimental And Numerical Investigation Of Unsteady Bluff Body Flows
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Author : Raghuram Devarakonda
language : en
Publisher:
Release Date : 1994
Experimental And Numerical Investigation Of Unsteady Bluff Body Flows written by Raghuram Devarakonda 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.
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.
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.
Modellen Oud Borduurwerk
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Author :
language : en
Publisher:
Release Date : 1899
Modellen Oud Borduurwerk written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1899 with categories.
Experimental Investigation Of The Wake Behind An Axisymmetrical Bluff Body Phd
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Author : Stefan Gunther Siegel
language : en
Publisher:
Release Date : 1999
Experimental Investigation Of The Wake Behind An Axisymmetrical Bluff Body Phd written by Stefan Gunther Siegel 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.
Experimental Investigation Of Unsteady Shock Wave Turbulent Boundary Layer Interactions About A Blunt Fin
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Author : Paul J. Barnhart
language : en
Publisher:
Release Date : 1995
Experimental Investigation Of Unsteady Shock Wave Turbulent Boundary Layer Interactions About A Blunt Fin written by Paul J. Barnhart 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.
Experimental Investigation Of Unsteady Shock Wave Turbulent Boundary Layer Interactions About A Blunt Fin
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Author :
language : en
Publisher:
Release Date : 1997
Experimental Investigation Of Unsteady Shock Wave Turbulent Boundary Layer Interactions About A Blunt Fin written by 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.
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.