Efficient and robust Schur complement approximations in the augmented Lagrangian preconditioner for the incompressible laminar flows

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Abstract

This paper introduces three new Schur complement approximations for the augmented Lagrangian preconditioner. The incompressible Navier-Stokes equations discretized by a stabilized finite element method are utilized to evaluate these new approximations of the Schur complement. A wide range of numerical experiments in the laminar context determines the most efficient Schur complement approximation and investigates the effect of the Reynolds number, mesh anisotropy and refinement on the optimal choice. Furthermore, the advantage over the traditional Schur complement approximation is exhibited.

Original languageEnglish
Article number109286
Number of pages18
JournalJournal of Computational Physics
Volume408
DOIs
Publication statusPublished - 1 May 2020

Keywords

  • Augmented Lagrangian preconditioner
  • Block structured preconditioners
  • Navier-Stokes equations
  • Schur complement approximations
  • Stabilized finite element method

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