Boundary infinite elements for the Helmholtz equation in exterior domains

Isaac Harari, Paul E. Barbone, Michael Slavutin, Rami Shalom

Research output: Contribution to journalArticlepeer-review


A novel approach to the development of infinite element formulations for exterior problems of time-harmonic acoustics is presented. This approach is based on a functional which provides a general framework for domainbased computation of exterior problems. Special cases include non-reflecting boundary conditions (such as the DtN method). A prominent feature of this formulation is the lack of integration over the unbounded domain, simplifying the task of discretization. The original formulation is generalized to account for derivative discontinuities across infinite element boundaries, typical of standard infinite element approximations. Continuity between finite elements and infinite elements is enforced weakly, precluding compatibility requirements. Various infinite element approximations for two-dimensional configurations with circular interfaces are presented. Implementation requirements are relatively simple. Numerical results demonstrate the good performance of this scheme.

Original languageEnglish
Pages (from-to)1105-1131
Number of pages27
JournalInternational Journal for Numerical Methods in Engineering
Issue number6
StatePublished - 1998


  • Acoustics
  • Finite element methods
  • Infinite elements
  • Unbounded domains


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