Subdiffusion with a time-dependent coefficient: Analysis and numerical solution

Jin, Bangti; Li, Buyang; Zhou, Zhi

doi:10.1090/mcom/3413

Subdiffusion with a time-dependent coefficient: Analysis and numerical solution
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by Bangti Jin, Buyang Li and Zhi Zhou;

Math. Comp. 88 (2019), 2157-2186

DOI: https://doi.org/10.1090/mcom/3413

Published electronically: February 6, 2019

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Abstract:

In this work, a complete error analysis is presented for fully discrete solutions of the subdiffusion equation with a time-dependent diffusion coefficient, obtained by the Galerkin finite element method with conforming piecewise linear finite elements in space and backward Euler convolution quadrature in time. The regularity of the solutions of the subdiffusion model is proved for both nonsmooth initial data and incompatible source term. Optimal-order convergence of the numerical solutions is established using the proven solution regularity and a novel perturbation argument via freezing the diffusion coefficient at a fixed time. The analysis is supported by numerical experiments.

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