A least squares finite element formulation for elastodynamic problems

Rudra Pratap, Tribikram Kundu

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

A residual finite element formulation is developed in this paper to solve elastodynamic problems in which body wave potentials are primary unknowns. The formulation is based on minimizing the square of the residuals of governing equations as well as all boundary conditions. Since the boundary conditions in terms of wave potentials are neither Dirichlet nor Neumann type it is difficult to construct a functional to satisfy all governing equations and boundary conditions following the variational principle designed for conventional finite element formulation. That is why the least squares technique is sought. All boundary conditions are included in the functional expression so that the satisfaction of any boundary condition does not become a requirement of the trial functions, but they should satisfy some continuity conditions across the interelement boundary to guarantee proper convergence. In this paper it is demonstrated that the technique works well for elastodynamic problems; however, it is equally applicable to any other field problem.

Original languageEnglish (US)
Pages (from-to)1883-1891
Number of pages9
JournalInternational Journal for Numerical Methods in Engineering
Volume26
Issue number8
DOIs
StatePublished - Aug 1988

ASJC Scopus subject areas

  • Numerical Analysis
  • Engineering(all)
  • Applied Mathematics

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