Symmetries and dynamics for 2-D Navier-Stokes flow

Hans Armbruster, B. Nicolaenko, N. Smaoui, Pascal Chossat

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Simulations of forced 2-D Navier-Stokes equations are analyzed. The forcing is spatially periodic and temporally steady. A Karhunen-Loève analysis is used to identify the structures in phase space that generate the PDE behavior. Their relationship to the invariant subspaces generated by the symmetry group is discussed. It is shown that certain modes that are in the stable eigenspace of the Kolmogorov flow solution play an essential role for the dynamics of the attractor for the 2-D Navier-Stokes equations below a Reynolds number of about 30. In this regime all stable solutions are identified and their relation to the symmetry structure is elucidated. A new type of gluing bifurcation generated by the symmetry is found and analyzed. A mechanism for the generation of bursting behavior is suggested.

Original languageEnglish (US)
Pages (from-to)81-93
Number of pages13
JournalPhysica D: Nonlinear Phenomena
Volume95
Issue number1
DOIs
StatePublished - Jan 1 1996

Keywords

  • Bifurcations
  • Navier-Stokes equations
  • Symmetry

ASJC Scopus subject areas

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

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