Preserving dissipation in approximate inertial forms for the Kuramoto-Sivashinsky equation

M. S. Jolly, Yannis Kevrekidis, E. S. Titi

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31 Scopus citations


It has been observed, in earlier computations of bifurcation diagrams for dissipative partial differential equations, that the use of certain explicit approximate inertial forms can give rise to numerical artifacts such as spurious turning points and inaccurate solution branches. These shortcomings were attributed to a lack of dissipation in the forms used. We show analytically and verify numerically that with an appropriate adjustment we can eliminate these numerical artifacts. The motivation for this adjustment is to enforce dissipation, while maintaining the same order of approximation. We demonstrate with computations that the most natural remedy, namely, preparation of the equation, can be highly sensitive to assumptions on the size of the absorbing ball. In addition, we show that certain implicit forms are dissipative without any adjustment. As an illustrative example we use here the Kuramoto-Sivashinsky equation.

Original languageEnglish (US)
Pages (from-to)179-197
Number of pages19
JournalJournal of Dynamics and Differential Equations
Issue number2
StatePublished - Apr 1 1991

All Science Journal Classification (ASJC) codes

  • Analysis


  • Inertial manifold
  • Kuramoto-Sivashinsky
  • dissipation
  • non-linear Galerkin method


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