Fast fourier transform of spectral boundary elements for transient heat conduction

L. R. Hill, T. N. Farris

Research output: Contribution to journalArticle

9 Scopus citations


The spectral boundary element method for solving two-dimensional transient heat conduction problems is developed. This method is combined with the fast Fourier transform (FFT) to convert the solution between the time and frequency domains. The fundamental solutions in the frequency domain, required for the present method, are discussed. The resulting line integrations in the frequency domain are discretized using constant boundary elements and used in a Fortran boundary element program. Three examples are used to illustrate the accuracy and effectiveness of the method in both the frequency and time domains. First, the frequency domain solution procedure is verified using the steady-state example of a semi-infinite half space with a heat flux applied to a patch of the surface. This spectral boundary element method is then applied to the problem of a circular hole in an infinite solid subjected to a time-varying heat flux, and solutions in both the frequency and time domains are presented. Finally, the method is used to solve the circular hole problem with a convection boundary condition. The accurary of these results leads to the conclusion that the spectral boundary element method in conjunction with the FFT is a viable option for transient problems. In addition, this spectral approach naturally produces frequence domain information which is itself of interest.

Original languageEnglish (US)
Pages (from-to)813-827
Number of pages15
JournalInternational Journal of Numerical Methods for Heat & Fluid Flow
Issue number9
StatePublished - Sep 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications
  • Applied Mathematics


  • Fast Fourier transform
  • Spectral boundary elements

Fingerprint Dive into the research topics of 'Fast fourier transform of spectral boundary elements for transient heat conduction'. Together they form a unique fingerprint.

  • Cite this