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Computation of symmetric, time-periodic solutions of the vortex sheet with surface tension
Journal article   Open access

Computation of symmetric, time-periodic solutions of the vortex sheet with surface tension

David M Ambrose and Jon Wilkening
Proceedings of the National Academy of Sciences - PNAS, v 107(8), pp 3361-3366
23 Feb 2010
PMID: 20133691
url
https://doi.org/10.1073/pnas.0910830107View
Published, Version of Record (VoR) Open

Abstract

optimal control standing waves Physical Sciences bifurcation adjoint method fluid interface
A numerical method is introduced for the computation of time-periodic vortex sheets with surface tension separating two immiscible, irrotational, two-dimensional ideal fluids of equal density. The approach is based on minimizing a nonlinear functional of the initial conditions and supposed period that is positive unless the solution is periodic, in which case it is zero. An adjoint-based optimal control technique is used to efficiently compute the gradient of this functional. Special care is required to handle singular integrals in the adjoint formulation. Starting with a solution of the linearized problem about the flat rest state, a family of smooth, symmetric breathers is found that, at quarter-period time intervals, alternately pass through a flat state of maximal kinetic energy, and a rest state in which all the energy is stored as potential energy in the interface. In some cases, the interface overturns before returning to the initial, flat configuration. It is found that the bifurcation diagram describing these solutions contains several disjoint curves separated by near-bifurcation events.

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Collaboration types
Domestic collaboration
Web of Science research areas
Mathematics, Applied
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