Approximate solution of space fractional order diffusion equations by Gegenbauer collocation and compact finite difference scheme

Abstract

In this paper, approximation of space fractional order di usion equation are considered using compact finite di erence technique to discretize the time derivative, which was then approximated via shifted Gegenbauer polynomials using zeros of (N 􀀀 1) degree shifted Gegenbauer polynomial as collocation points. The important feature in this approach is that it reduces the problems to algebraic linear system of equations together with the boundary conditions gives (N + 1) linear equations. Some theorems are given to establish the convergence and the stability of the proposed method. To validate the e ciency and the accuracy of the method, obtained results are compared with the existing results in the literature. The graphical representation are also displayed for various values of 􀀀 Gegenbauer polynomials. It can be observe in the tables of the results and figures that the proposed method performs better than the existing one in the literature.