• Medientyp: E-Artikel
  • Titel: A priori error analysis for finite element approximations of the Stokes problem on dynamic meshes
  • Beteiligte: Brenner, Andreas [VerfasserIn]; Bänsch, Eberhard [VerfasserIn]; Bause, Markus [VerfasserIn]
  • Erschienen: OPUS FAU - Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg, 2014
  • Sprache: Englisch
  • DOI: https://doi.org/10.1093/imanum/drt001
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  • Beschreibung: In this article we study finite element approximations of the time-dependent Stokes system on dynamically changing meshes. Applying the backward Euler method for time discretization we use the discrete Helmholtz or Stokes projection to evaluate the solution at time tn−1 on the new spatial mesh at time tn. The theoretical results consist of a priori error estimates that show a dependence on the time step size not better than O(1/Δt). These surprisingly pessimistic upper bounds are complemented by numerical examples giving evidence for a negative convergence rate, at least for a large range of time step sizes, and in this sense backing our theory. These observations imply that using adaptive meshes for incompressible flow problems is delicate and requires further investigation.
  • Zugangsstatus: Freier Zugang