Finite Element Solutions for the Space Fractional Diffusion Equation with a Nonlinear Source Term. (6th September 2012)

• Record Type: Journal Article
• Authors: Choi, Y. J.; Chung, S. K.
• Other Names: Ahmad Bashir Academic Editor.
• Is Part Of: Abstract and applied analysis. Volume 2012(2012)
• Publication Date: 2012-09-06
• Subjects: Mathematical analysis -- Periodicals; Mathematical analysis; Applied Mathematics; Mathematical Analysis; Periodicals; 515.05
• DOI: 10.1155/2012/596184
• Languages: English
• ISSNs: 1085-3375

Abstract

Abstract : We consider finite element Galerkin solutions for the space fractional diffusion equation with a nonlinear source term. Existence, stability, and order of convergence of approximate solutions for the backward Euler fully discrete scheme have been discussed as well as for the semidiscrete scheme. The analytical convergent orders are obtained as O ( k + h γ ˜ ), where γ ˜ is a constant depending on the order of fractional derivative. Numerical computations are presented, which confirm the theoretical results when the equation has a linear source term. When the equation has a nonlinear source term, numerical results show that the diffusivity depends on the order of fractional derivative as we expect.