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The structure of an unstable circular vortex in a background straining flow

Published online by Cambridge University Press:  06 August 2002

KEITH HIGGINS ,
ANDREW OOI  and
M. S. CHONG
KEITH HIGGINS
Affiliation:
Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia
ANDREW OOI
Affiliation:
Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia
M. S. CHONG
Affiliation:
Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia
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Abstract

The formation of compound vortices from a ‘shielded’ vortex monopole embedded in a two-dimensional background straining flow is studied numerically. The computations are performed in plane polar coordinates using an infinite radial domain Navier–Stokes solver. The straining flow excites an azimuthal instability, leading to vortex tripole formation in the case of small strain rates. For larger strain rates, tripole formation proceeds briefly before the structure is destroyed by the dominant background straining flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 462 , 10 July 2002 , pp. 31 - 42
Copyright
© 2002 Cambridge University Press

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