H1-second order convergent estimates for non Fickian models

• Main Author: Barbeiro, S.
• Publication Date: 2009
• Other Authors: Ferreira, J. A., Pinto, L.
• Format: Other
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: https://hdl.handle.net/10316/11163
• topic: Non Fickian models; Finite difference method; Piecewise linear finite element method; Supraconvergence; Superconvergence

In this paper we study numerical methods for integro-differential initial boundary value problems that arise, naturally, in many applications such as heat conduction in materials with memory, diffusion in polymers and diffusion in porous media. We propose finite difference methods to compute approximations for the continuous solutions of such problems. For those methods we analyze the stability and study the convergence. We prove a supraconvergent estimate. As such methods can be seen as lumped mass methods, our supraconvergent result is a superconvergent result in the context of finite element methods. Numerical results illustrating the theoretical results are included.