Title

Motion of a vortex filament in the local induction approximation: a perturbative approach

Authors

Authors

R. A. Van Gorder

Comments

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Abbreviated Journal Title

Theor. Comput. Fluid Dyn.

Keywords

Vortex dynamics; Vortex filament; Local induction approximation; Perturbation method; EQUATIONS; WAVES; KNOTS; Mechanics; Physics, Fluids & Plasmas

Abstract

Very recently, Shivamoggi and van Heijst (Phys Lett A 374:1742, 2010) reformulated the Da Rios-Betchov equations in the extrinsic vortex filament coordinate space and were able to find an exact solution to an approximate equation governing a localized stationary solution. The approximation in the governing equation was due to the author's consideration of a first-order approximation of dx/ds = 1/root 1 + y(x)(2) + z(x)(2); previously, an order-zero approximation was considered by Dmitriyev (Am J Phys 73:563, 2005). Such approximations result in exact solutions, but these solutions may break down outside of specific parameter regimes. Presently, we avoid making the simplifying assumption on dx/ds, which results in a much more difficult governing equation to solve. However, we are able to obtain perturbation solutions, by way of the delta-expansion method, which cast light on this more general problem. We find that such solutions more readily agree with the numerical solutions, while our solutions also match those exact solutions present in the literature for certain values of the parameters (corresponding to y(x)(2)+z(x)(2) < < 1).

Journal Title

Theoretical and Computational Fluid Dynamics

Volume

26

Issue/Number

1-4

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

161

Last Page

171

WOS Identifier

WOS:000298644200011

ISSN

0935-4964

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