Optimal operator preconditioning for Galerkin boundary element methods on 3-dimensional screens

Ralf Hiptmair, Carlos Jerez-Hanckes, Carolina Urzúa-Torres

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We consider first-kind weakly singular and hypersingular boundary integral operators for the Laplacian on screens in R3 and their Galerkin discretization by means of low-order piecewise polynomial boundary elements. For the resulting linear systems of equations we propose novel Calderón-type preconditioners based on (i) new boundary integral operators, which provide the exact inverses of the weakly singular and hypersingular operators on flat disks, and (ii) stable duality pairings relying on dual meshes. On screens obtained as images of the unit disk under bi-Lipschitz transformations, this approach achieves condition numbers uniformly bounded in the meshwidth even on locally refined meshes. Comprehensive numerical tests also confirm its excellent preasymptotic performance.

Original languageEnglish
Pages (from-to)834-857
Number of pages24
JournalSIAM Journal on Numerical Analysis
Volume58
Issue number1
DOIs
StatePublished - 2020
Externally publishedYes

Keywords

  • Boundary element methods
  • Boundary integral operators
  • Operator preconditioning
  • Screens

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