Mittag-Leffler stability of numerical solutions to linear homogeneous time fractional parabolic equations

Wen Dong; Dongling Wang; Wen Dong; Dongling Wang

doi:10.3934/nhm.2023041

Networks and Heterogeneous Media

2023, Volume 18, Issue 3: 946-956. doi: 10.3934/nhm.2023041

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Mittag-Leffler stability of numerical solutions to linear homogeneous time fractional parabolic equations

Wen Dong ¹,
Dongling Wang ^{2
,
,}

1.
School of Mathematics, Northwest University, Xi'an, Shaanxi, 710127, P.R. China
2.
School of Mathematics and Computational Science, Xiangtan University, Xiangtan, Hunan, 411105, P.R. China

Received: 27 December 2022 Revised: 12 February 2023 Accepted: 08 March 2023 Published: 20 March 2023

In a bounded domain, the solution of linear homogeneous time fractional parabolic equation is known to exhibit polynomial type decay rate (the so-called Mittag-Leffler stability) over time, which is quite different from the exponential decay of classical parabolic equation. We firstly use the finite element method or finite difference method to discretize the parabolic equation in space to obtain fractional ordinary differential equation, and then use fractional linear multistep method (F-LMM) to discretize in time to obtain a fully discretized schemes. We prove that the strongly $ A $-stable F-LMM method combined with appropriate spatial discretization can accurately maintain the long-term optimal algebraic decay rate of the original continuous equation. Numerical examples are included to confirm the correctness of our theoretical analysis.
- sub-diffusion equation,
- Mittag-Leffler stability,
- polynomial decay rate,
- fractional LMM
Citation: Wen Dong, Dongling Wang. Mittag-Leffler stability of numerical solutions to linear homogeneous time fractional parabolic equations[J]. Networks and Heterogeneous Media, 2023, 18(3): 946-956. doi: 10.3934/nhm.2023041

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Abstract

In a bounded domain, the solution of linear homogeneous time fractional parabolic equation is known to exhibit polynomial type decay rate (the so-called Mittag-Leffler stability) over time, which is quite different from the exponential decay of classical parabolic equation. We firstly use the finite element method or finite difference method to discretize the parabolic equation in space to obtain fractional ordinary differential equation, and then use fractional linear multistep method (F-LMM) to discretize in time to obtain a fully discretized schemes. We prove that the strongly $ A $-stable F-LMM method combined with appropriate spatial discretization can accurately maintain the long-term optimal algebraic decay rate of the original continuous equation. Numerical examples are included to confirm the correctness of our theoretical analysis.

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