Resumen de The defect-correction technique applied to singularly perturbed elliptic problems of convection- diffusion type

José Luis Gracia Lozano , E. O'Riordan, Carmelo Clavero Gracia

• In this work the defect¿correction technique is used to solve some singularly perturbed elliptic boundary value problems of convection-diffusion type. In [3] it was proved that the use of standard defect¿correction technique allows one improve the order of convergence of stable low order finite difference schemes. Nevertheless, the analysis of the uniform convergence is difficult for 1D problems and at the moment we do not know of any theoretical result proving uniform convergence for general 2D elliptic problems.

  In [4] a variant of this approach was proposed in order to simplify the analysis for 1D problems of convection-diffusion type, proving almost second order uniform convergence of the method. In this paper we show numerically that it is possible to extend the parameter-uniform method given in [4] to the case of a 2D elliptic boundary value problem