Abstract
Fourth order finite-difference algorithms for a semilinear singularly perturbed reaction–diffusion problem are discussed and compared both theoretically and numerically. One of them is the method of Sun and Stynes (1995) which uses a piecewise equidistant discretization mesh of Shishkin type. Another one is a simplified version of Vulanović's method (1993), based on a discretization mesh of Bakhvalov type. It is shown that the Bakhvalov mesh produces much better numerical results.
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Vulanović, R. Fourth order algorithms for a semilinear singular perturbation problem. Numerical Algorithms 16, 117–128 (1997). https://doi.org/10.1023/A:1019187013584
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DOI: https://doi.org/10.1023/A:1019187013584