Bifurcations in systems with Z2 spatio-temporal and O(2) spatial symmetry

F. Marques, Juan Lopez, H. M. Blackburn

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

This work analyzes the O(2) symmetry breaking bifurcations in systems with an Z2×O(2) symmetry group - where Z2 and O(2) are, respectively, spatio-temporal and spatial symmetries - that are responsible for the transitions from two-dimensional to three-dimensional hydrodynamic states. This symmetry group describes, for example, two-dimensional time-periodic flows past bodies which have reflection symmetry across a wake center plane, such as symmetrical airfoils, circular and square cylinders. Normal form analysis of these systems is based on a joint representation of the monodromy matrix for the half-period-flip map (a composition of a half-period temporal evolution with a spatial reflection) and the spatial O(2) symmetry. There are exactly two kinds of codimension-one synchronous bifurcations in these systems; one preserves the Z2 spatio-temporal symmetry, while the other breaks it. When the Floquet multipliers occur in complex-conjugate pairs (non-resonant with the periodic basic state), there is a single codimension-one bifurcation, and at the bifurcation point two different kind of solutions appear simultaneously: a pair of modulated traveling waves, and a circle of modulated standing waves. At most one of these two types has stable solutions. The symmetries of the system also admit period-doubling bifurcations, but these are codimension-two and the normal form analysis permits specific conclusions regarding these. There are also a number of other codimension-two bifurcations leading to mixed modes and the strong 1:1 and 1:2 resonances. All the codimension-one bifurcations are illustrated with reference to a concrete physical example.

Original languageEnglish (US)
Pages (from-to)247-276
Number of pages30
JournalPhysica D: Nonlinear Phenomena
Volume189
Issue number3-4
DOIs
StatePublished - Mar 1 2004

Keywords

  • Floquet analysis
  • Normal forms
  • Symmetry breaking

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Applied Mathematics

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