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Simulation of the initial 3-D instability of a vortex ring Open Access

Descriptions

Other title
Subject/Keyword
Ring
Vortex
Simulation
Instability
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wiwchar, Justin
Supervisor and department
Sigurdson, Lorenz (Mechanical Engineering)
Examining committee member and department
Freeman, Mark (Physics)
Lange, Carlos (Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2010-08-12T14:36:03Z
Graduation date
2010-11
Degree
Master of Science
Degree level
Master's
Abstract
Computational simulations of a perturbed vortex ring are performed to recreate and understand the instability seen in impacting water droplet experiments. Three initial conditions are tried to respectively trigger a Widnall instability, a Rayleigh centrifugal instability, and a vortex breakdown instability. Simulations with a perturbed solitary ring result in an instability similar to that seen experimentally. Waviness of the core which would be expected from a Widnall instability is not visible. Adding an opposite-signed secondary vortex ring or an image vortex ring to the initial conditions does not appear to significantly change the instability from what is seen with a solitary ring. This suggests that a Rayleigh centrifugal instability or a vortex breakdown instability are not likely at work, though tests are not conclusive. Elliptical streamlines are visible in the core of the solitary ring at early times, suggesting that an elliptic instability may be the source of the experimental instability.
Language
English
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File size: 9444266
Last modified: 2015:10:12 16:49:19-06:00
Filename: Wiwchar_Justin_Fall 2010.pdf
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File title: Details of Perturbations Used
File author: jwiwchar
Page count: 139
File language: en-CA
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