Numerical solution of singularly perturbed self-adjoint boundary value problem using Galerkin method

Abstract

This paper presents numerical solution of second order singularly perturbed self-adjoint boundary value problems using weighted residual method of Galerkin type. First, for the given problem, the residue was computed using appropriate approximated basis function which satisfies all the boundary conditions. Then, using the chosen weighting function, integrating the weighted residue over the domain and the given differential equation is transformed to linear systems of algebraic equations. Further, these algebraic equations were solved using Galerkin method. To validate the applicability of the proposed method, two model examples have been considered and solved for different values of perturbation parameter and with different order of basis function. Additionally, convergence of error bounds has been established for the method. As it can be observed from the numerical results, the present method approximates the exact solution very well. Moreover, the present method gives better accuracy when the order of basis function is increased and it also improves the result of the methods existing in the literature.
 Keywords: Singularly perturbed problems, Self-adjoint problem, Galerkin method, Boundary value problems.

Graded mesh B-spline collocation method for two parameters singularly perturbed boundary value problems

“…For the problem classes of these two special cases, there is a huge number of research papers devoted to their numerical solving, however there are only few number of research papers for the purely two parameters case . For problem classes of case (reaction diffusion problem)for instance research papers like [4] , [5] , [6] , [7] , [8] and for (convection diffusion problem) papers like [9] , [10] , [11] , [12] are available in the literature.…”