Abstract
In this article we study the two dimensional singularly perturbed heat equation in a circular domain. The aim is to develop a numerical method with a uniform mesh, avoiding mesh refinement at the boundary thanks to the use of a relatively simple representation of the boundary layer. We provide the asymptotic expansion of the solution at first order and derive the boundary layer element resulting from the boundary layer analysis. We then perform the convergence analysis introducing the boundary layer element in the finite element space thus obtaining what is called an “enriched Galerkin space”. Finally we present and comment on numerical simulations using a quasi-uniform grid and the modified finite element method.
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This work was supported in part by NSF Grants DMS 1206438 and by the Research Fund of Indiana University.
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Hong, Y. Numerical Approximation of the Singularly Perturbed Heat Equation in a Circle. J Sci Comput 62, 1–24 (2015). https://doi.org/10.1007/s10915-014-9845-x
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DOI: https://doi.org/10.1007/s10915-014-9845-x