A meshless method for an inverse two-phase one-dimensional nonlinear Stefan problem

B. Tomas Johansson, Daniel Lesnic, Thomas Reeve

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11 Citations (Scopus)
252 Downloads (Pure)

Abstract

We extend a meshless method of fundamental solutions recently proposed by the authors for the one-dimensional two-phase inverse linear Stefan problem, to the nonlinear case. In this latter situation the free surface is also considered unknown which is more realistic from the practical point of view. Building on the earlier work, the solution is approximated in each phase by a linear combination of fundamental solutions to the heat equation. The implementation and analysis are more complicated in the present situation since one needs to deal with a nonlinear minimization problem to identify the free surface. Furthermore, the inverse problem is ill-posed since small errors in the input measured data can cause large deviations in the desired solution. Therefore, regularization needs to be incorporated in the objective function which is minimized in order to obtain a stable solution. Numerical results are presented and discussed.
Original languageEnglish
Pages (from-to)61-77
JournalMathematics and Computers in Simulation
Volume101
Early online date29 Mar 2014
DOIs
Publication statusPublished - 1 Jul 2014

Keywords

  • Heat conduction
  • Inverse Stefan problem
  • Method of fundamental solutions
  • Two-phase change
  • Regularization

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