Journal article
Computation of symmetric, time-periodic solutions of the vortex sheet with surface tension
Proceedings of the National Academy of Sciences - PNAS, Vol.107(8), pp.3361-3366
23 Feb 2010
PMCID: PMC2840482
PMID: 20133691
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Abstract
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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Details
- Title
- Computation of symmetric, time-periodic solutions of the vortex sheet with surface tension
- Creators
- David M Ambrose - Department of Mathematics, Drexel University, Philadelphia, PA 19104; andJon Wilkening - Department of Mathematics, University of California, Berkeley, CA 94720
- Publication Details
- Proceedings of the National Academy of Sciences - PNAS, Vol.107(8), pp.3361-3366
- Publisher
- National Academy of Sciences
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mathematics
- Identifiers
- 991014878048604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Mathematics, Applied