Research Articles (Mathematics)
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Browsing by Author "Appadu, Appanah R."
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Item A NSFD discretization of two-dimensional singularly perturbed semilinear convection-diffusion problems(Frontiers Media, 2022) Kehinde, Olawale O.; Munyakazi, Justin B.; Appadu, Appanah R.Despite the availability of an abundant literature on singularly perturbed problems, interest toward non-linear problems has been limited. In particular, parameter-uniform methods for singularly perturbed semilinear problems are quasi-non-existent. In this article, we study a two-dimensional semilinear singularly perturbed convection-diffusion problems. Our approach requires linearization of the continuous semilinear problem using the quasilinearization technique. We then discretize the resulting linear problems in the framework of non-standard finite difference methods. A rigorous convergence analysis is conducted showing that the proposed method is first-order parameter-uniform convergent. Finally, two test examples are used to validate the theoretical findings.