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Topological fluid mechanics of point vortex motions

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Title: Topological fluid mechanics of point vortex motions
Author(s): Boyland, Philip L.; Stremler, Mark A.; Aref, Hassan
Subject(s): vortex dynamics
Abstract: Topological techniques are used to study the motions of systems of point vortices in the infinite plane, in singly-periodic arrays, and in doubly-periodic lattices. Restricting to three vortices with zero net circulation, the symmetries are used to reduce each system to a one-degree-of-freedom Hamiltonian. The phase portrait of the reduced system is subdivided into regimes using the separatrix motions, and a braid representing the topology of all vortex motions in each regime is computed. This braid also describes the isotopy class of the advection homeomorphism induced by the vortex motion. The Thurston–Nielsen theory is then used to analyze these isotopy classes, and in certain cases strong implications about the chaotic dynamics of the advection can be drawn. This points to an important mechanism by which the topological kinematics of large-scale, two-dimensional fluid motions generate chaotic advection.
Issue Date: 2002-10
Publisher: Department of Theoretical and Applied Mechanics (UIUC)
Series/Report: TAM Reports 1012
Genre: Technical ReportArticle
Type: Text
Language: English
URI: http://hdl.handle.net/2142/279
ISSN: 0073-5264
Publication Status: published or submitted for publication
Peer Reviewed: is peer reviewed
Date Available in IDEALS: 2007-03-08
Is Version Of: Published as: Philip L. Boyland, Mark A. Stremler, and Hassan Aref. Topological fluid mechanics of point vortex motions. Physica D: Nonlinear Phenomena, Vol. 175, No. 1-2, 2002, pp. 69-95. DOI: 10.1016/S0167-2789(02)00692-9. Copyright 2002 Elsevier Science.
 

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  • Theoretical and Applied Mechanics (TAM) Technical Reports
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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