Numerische Mathematik

, Volume 138, Issue 4, pp 801–838 | Cite as

Mesh requirements for the finite element approximation of problems with sign-changing coefficients

  • Anne-Sophie Bonnet-Ben Dhia
  • Camille Carvalho
  • Patrick CiarletJr


Transmission problems with sign-changing coefficients occur in electromagnetic theory in the presence of negative materials surrounded by classical materials. For general geometries, establishing Fredholmness of these transmission problems is well-understood thanks to the \(\mathtt {T}\)-coercivity approach. Moreover, for a plane interface, there exist meshing rules that guarantee an optimal convergence rate for the finite element approximation. We propose here a new treatment at the corners of the interface which allows to design meshing rules for an arbitrary polygonal interface and then recover standard error estimates. This treatment relies on the use of simple geometrical transforms to define the meshes. Numerical results illustrate the importance of this new design.

Mathematics Subject Classification

65N30 78A48 35J20 35B65 


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Copyright information

© Springer-Verlag GmbH Deutschland 2017

Authors and Affiliations

  • Anne-Sophie Bonnet-Ben Dhia
    • 1
  • Camille Carvalho
    • 2
  • Patrick CiarletJr
    • 1
  1. 1.POEMS, ENSTA ParisTech, CNRS, INRIA, Université Paris-SaclayPalaiseau CedexFrance
  2. 2.Applied Mathematics Unit, School of Natural SciencesUniversity of California, MercedMercedUSA

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