Transient heat conduction in homogeneous and non-homogeneous materials by the Laplace transform Galerkin boundary element method

Alok Sutradhar, Glaucio H. Paulino, L. J. Gray

Research output: Contribution to journalArticle


The Green's function for three-dimensional transient heat conduction (diffusion equation) for functionally graded materials (FGMs) is derived. The thermal conductivity and heat capacitance both vary exponentially in one coordinate. In the process of solving this diffusion problem numerically, a Laplace transform (LT) approach is used to eliminate the dependence on time. The fundamental solution in Laplace space is derived and the boundary integral equation formulation for the Laplace Transform boundary element method (LTBEM) is obtained. The numerical implementation is performed using a Galerkin approximation, and the time-dependence is restored by numerical inversion of the LT. Two numerical inversion techniques have been investigated: a Fourier series method and Stehfest's algorithm, the latter being preferred. A number of test problems have been examined, and the results are in excellent agreement with available analytical solutions.

Original languageEnglish (US)
Pages (from-to)119-132
Number of pages14
JournalEngineering Analysis with Boundary Elements
Issue number2
StatePublished - Feb 1 2002



  • Functionally graded materials
  • Galerkin approximation
  • Green's functions
  • Laplace transform boundary element method
  • Transient heat conduction

ASJC Scopus subject areas

  • Analysis
  • Engineering(all)
  • Computational Mathematics
  • Applied Mathematics

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