Abstract
We derive a spectral collocation approximation to the fractional Laplacian operator based on the Riemann-Liouville fractional derivative operators on a bounded domain Ω = [a, b]. Corresponding matrix representations of (−△)α/2 for α ∈ (0,1) and α ∈ (1,2) are obtained. A space-fractional advection-dispersion equation is then solved to investigate the numerical performance of this method under various choices of parameters. It turns out that the proposed method has high accuracy and is efficient for solving these space-fractional advection-dispersion equations when the forcing term is smooth.
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Acknowledgements
H. Lu was supported in part by the NSF of China (No. 11601278), the PSF of China (No. 2016M592172) and the NSF of Shandong Province (No. ZR2016AP01). P. W. Bates was supported partly by the NSF DMS-0908348 and DMS-1413060. M. Zhang was supported in part by start-up funds for new faculties at New Mexico Institute of Mining and Technology.
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Communicated by: Carlos Garcia-Cervera
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Lu, H., Bates, P.W., Chen, W. et al. The spectral collocation method for efficiently solving PDEs with fractional Laplacian. Adv Comput Math 44, 861–878 (2018). https://doi.org/10.1007/s10444-017-9564-6
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DOI: https://doi.org/10.1007/s10444-017-9564-6
Keywords
- Fractional Laplacian
- Collocation method
- Space-fractional advection-dispersion equation
- Fractional differentiation matrix