Error analysis of semidiscrete finite element methods for inhomogeneous time-fractional diffusion

B. Jin, R. Lazarov, J. Pasciak, Z. Zhou

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

© 2014 Published by Oxford University Press on behalf of the Institute of Mathematics and its Applications. All rights reserved. We consider the initial-boundary value problem for an inhomogeneous time-fractional diffusion equation with a homogeneous Dirichlet boundary condition, a vanishing initial data and a nonsmooth right-hand side in a bounded convex polyhedral domain. We analyse two semidiscrete schemes based on the standard Galerkin and lumped mass finite element methods. Almost optimal error estimates are obtained for right-hand side data f (x, t) ε L∞ (0, T; Hq(ω)), ≤1≥ 1, for both semidiscrete schemes. For the lumped mass method, the optimal L2(ω)-norm error estimate requires symmetric meshes. Finally, twodimensional numerical experiments are presented to verify our theoretical results.
Original languageEnglish (US)
Pages (from-to)561-582
Number of pages22
JournalIMA Journal of Numerical Analysis
Volume35
Issue number2
DOIs
StatePublished - May 30 2014
Externally publishedYes

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