Corner singularities for elliptic problems: Integral equations, graded meshes, quadrature, and compressed inverse preconditioning
Författare
Summary, in English
We take a fairly comprehensive approach to the problem of solving elliptic partial differential equations numerically using integral equation methods on domains where the boundary has a large number of corners and branching points. Use of non-standard integral equations, graded meshes, interpolatory quadrature, and compressed inverse preconditioning are techniques that are explored, developed, mixed, and tested on some familiar problems in materials science. The recursive compressed inverse preconditioning, the major novelty of the paper, turns out to be particularly powerful and, when it applies, eliminates the need for mesh grading completely. In an electrostatic example for a multiphase granular material with about two thousand corners and triple junctions and a conductivity ratio between phases up to a million we compute a common functional of the solution with an estimated relative error of 10-12. In another example, five times as large but with a conductivity ratio of only a hundred, we achieve an estimated relative error of 10-14.
Avdelning/ar
- Matematik LTH
- Harmonic Analysis and Applications
Publiceringsår
2008
Språk
Engelska
Sidor
8820-8840
Publikation/Tidskrift/Serie
Journal of Computational Physics
Volym
227
Issue
20
Fulltext
- Available as PDF - 524 kB
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Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Mathematics
Nyckelord
- Corner singularity Multiphase material Triple-junction Integral equation Mesh grading Conductivity
Status
Published
Forskningsgrupp
- Harmonic Analysis and Applications
- Harmonic Analysis and Applications
ISBN/ISSN/Övrigt
- ISSN: 0021-9991