Journal
JOURNAL OF SCIENTIFIC COMPUTING
Volume 91, Issue 2, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10915-022-01812-z
Keywords
Fractional Fokker-Planck equation; Two-scale diffusion; Finite element; L-1 scheme; Error estimates
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Funding
- National Natural Science Foundation of China [12071195]
- AI and Big Data Funds [2019620005000775]
- Fundamental Research Funds for the Central Universities [lzujbky-2021-it26, lzujbky-2021-kb15]
- NSF of Gansu [21JR7RA537]
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In this paper, the fractional Fokker-Planck equation with two-scale diffusion is derived from the Levy process framework. A fully discrete scheme is then built using the L-1 scheme for time discretization and finite element method for space. The effectiveness of the algorithm is validated through extensive numerical experiments.
Fractional Fokker-Planck equation plays an important role in describing anomalous dynamics. To the best of our knowledge, the existing numerical discussions mainly focus on this kind of equation involving one diffusion operator. In this paper, we first derive the fractional Fokker-Planck equation with two-scale diffusion from the Levy process framework, and then the fully discrete scheme is built by using the L-1 scheme for time discretization and finite element method for space. With the help of the sharp regularity estimate of the solution, we optimally get the spatial and temporal error estimates. Finally, we validate the effectiveness of the provided algorithm by extensive numerical experiments.
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