Three-dimensional Mean Flow Experimental Study of Vortex Unwinding PDF Download
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Author: Catherine Bridget McGinley
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Book Description
Author: Catherine Bridget McGinley
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Book Description
Author: Coleman duP. Donaldson
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
The research efforts carried out at ARAP during the past five years in the field of viscous vortex motions are summarized. The work cited constitutes a rather extensive program of theo retical and experimental studies of vortex mo tions in general and of three-dimensional laminar and turbulent incompressible driven vortices in particular. The theoretical studies fall into three general categories; the first and most important comprising velocity distributions for steady laminar motion, the second dealing with unsteady velocity characteristics, and the third treating temperature distributions for the steady motions first considered. An evaluation and discussion of the effects of turbulence in real flows of the general type under consideration is included. The work performed and the results and conclusions reached in each of the areas of study already mentioned are discussed. (Author).
Author: D. M. Bushnell
Publisher:
ISBN:
Category : Submersibles
Languages : en
Pages : 52
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Author: Jeffrey S. Marshall
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 50
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Book Description
An experimental and computational study of the impact of a vortex with a body oriented normal to the vortex axis was performed. Particular focus was placed on understanding characteristics of the secondary vorticity ejected from the body and the interaction of the secondary vorticity with the primary vortex. Since both onset of boundary layer separation and the form of the secondary vorticity structures are sensitive to variation of the velocity normal to the body axis, the effect of normal velocity on vortex-body interaction was carefully examined. The physical features of the flow evolution were categorized in terms of an impact parameter and a thickness parameter, which respectively represent ratios of velocity and length scales associated with the vortex to those associated with the flow in the absence of the vortex. Experiments were performed using a combination of laser-induced fluorescence (LIF) flow visualization and particle-image velocimetry (PIV) in a water tank to examine the form of the secondary vorticity structures with both "high" and "low" values of the impact parameter for normal vortex interaction with a circular cylinder and with a thin blade. A new type of Lagrangian vorticity method based on a tetrahedral mesh was developed and applied to compute the secondary vorticity evolution during vortex-cylinder interaction. Computations were also performed for model problems to examine in detail wrapping of a vortex loop around a columnar vortex and impulsive cutting of a columnar vortex with finite axial flow.
Author: Thomas J. Zolper
Publisher:
ISBN:
Category : Vortex-motion
Languages : en
Pages : 176
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Book Description
Author: Gustavo Cesar Rachid Bodstein
Publisher:
ISBN:
Category : Acoustic streaming
Languages : en
Pages : 370
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Book Description
Author: José L. Stevens
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 142
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Author: D. H. Ross
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Book Description
The characteristics of vortex flows in enclosed chambers are strongly influenced by the existence of three-dimensional secondary flows in the endwall boundary layers and in a region near the axis. Classical 'line-vortex' or two-dimensional treatments fail to account for these effects and no theoretical treatment to date has been able to account for all of the complicated interactions. A series of flow visualization experiments was conducted to obtain a qualitative picture of the flow and the effects of changes in geometry and flow parameters. A transparent vortex chamber and selective dye injection into the water-working fluid were utilized. Interest centered on changes in the surface and shape of the end walls and on the exit hole. A form of endwall-boundary-layer slot blowing was effective in altering the secondary flow pattern. An approximate analysis is made to determine the effect of non-planar end-walls on boundary layer radial mass flow, based on the G.I. Taylor result for a conical swirl flow. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 896
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Book Description
Author: H. L. Chen
Publisher:
ISBN:
Category : Vortex motion
Languages : en
Pages : 68
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Book Description
In the present study, generation of two vortex rings and their cut-and-connect process were numerically simulated by solving three-dimensional and time-dependent Navier-Stokes equations, under conditions similar to the laboratory experiment. In order to explain the mechanism of cut-and-connect, velocity, vorticity, pressure, helicity density and energy dissipation were examined for the flow field of the cut-and-connect of vortex rings. The present study revealed that energy dissipation is an essential process for circulation cancellation during vortex tubes cutting. Based on this energy dissipation mechanism, it is concluded that the cut-and-connect of vortex tubes may occur in the limit of inviscid flows. This conclusion is particularly important to the three-dimensional discrete vortex method for computing high Reynolds number flows. Features of helicity in the three-dimensional flow field of cut-and-connect process of vortex tubes were also investigated. The relation between the helicity density and the energy dissipation function in the three-dimensional flow field was examined.
