Abstract
In this paper, we study a multiterm time-fractional initial-boundary value problem, whose differential equation contains a sum of Caputo time fractional derivatives with orders in (0, 1). In general, the solution of this kind of problem exhibits a weak regularity at the initial time. Based on the L1 formula on non-uniform meshes for time discretization and the local discontinuous Galerkin (LDG) method for space discretization, fully discrete numerical schemes for one and two space dimensions are constructed. The stability and convergence of the schemes are analyzed. It is shown that the error bounds are \(\alpha _1\)-robust, that is, they remain valid as \(\alpha _1\rightarrow 1^-\), where \(\alpha _1\) is the biggest fractional order. Furthermore, a numerical experiment is given to verify the effectiveness of the current method.
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Wang, Z. The local discontinuous Galerkin finite element method for a multiterm time-fractional initial-boundary value problem. J. Appl. Math. Comput. 68, 4391–4413 (2022). https://doi.org/10.1007/s12190-021-01608-8
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DOI: https://doi.org/10.1007/s12190-021-01608-8
Keywords
- Caputo fractional derivative
- Local discontinuous Galerkin method
- \(\alpha _1\)-robust
- Stability
- Convergence