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W4308842136 abstract "In this work, anisotropic bilinear finite element and second-order temporal approximation are adopted to establish a fully discrete scheme for the fractional substantial diffusion equation with variable coefficient. We prove the proposed discrete scheme is unconditionally stable in the senses of L 2 $$ {L}^2 $$ -norm and H 1 $$ {H}^1 $$ -norm. By introducing a new projection, the optimal convergence error in L 2 $$ {L}^2 $$ -norm and the superclose property in H 1 $$ {H}^1 $$ -norm are obtained under the condition of u ∈ H 3 ( Ω ) $$ uin {H}^3left(Omega right) $$ , where u $$ u $$ is the exact solution of the problem. Through interpolation post processing technique, we arrive at the global superconvergence of the interpolation. Furthermore, an improved algorithm is proposed to solve the problem with nonsmooth solution. Finally, numerical tests are given to illustrate the validity and efficiency of our theoretical analysis." @default.
W4308842136 created "2022-11-17" @default.
W4308842136 creator A5014723800 @default.
W4308842136 creator A5074444832 @default.
W4308842136 date "2022-11-11" @default.
W4308842136 modified "2023-09-27" @default.
W4308842136 title "Superconvergence analysis of anisotropic finite element method for the time fractional substantial diffusion equation with smooth and nonsmooth solutions" @default.
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W4308842136 doi "https://doi.org/10.1002/mma.8850" @default.
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