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- W4221156897 abstract "The study of generalising the central difference for integer order Laplacian to fractional order is discussed in this paper. Analysis shows that, in contrary to the conclusion of a previous study, difference stencils evaluated through fast Fourier transform prevents the convergence of the solution of fractional Laplacian. We propose a composite quadrature rule in order to efficiently evaluate the stencil coefficients with the required convergence rate in order to guarantee convergence of the solution. Furthermore, we propose the use of generalised higher order lattice Boltzmann method to generate stencils which can approximate fractional Laplacian with higher order convergence speed and error isotropy. We also review the formulation of the lattice Boltzmann method and discuss the explicit sparse solution formulated using Smolyak's algorithm, as well as the method for the evaluation of the Hermite polynomials for efficient generation of the higher order stencils. Numerical experiments are carried out to verify the error analysis and formulations." @default.
- W4221156897 created "2022-04-03" @default.
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- W4221156897 date "2022-02-13" @default.
- W4221156897 modified "2023-09-27" @default.
- W4221156897 title "On Generalisation of Isotropic Central Difference for Higher Order Approximation of Fractional Laplacian" @default.
- W4221156897 doi "https://doi.org/10.48550/arxiv.2202.06333" @default.
- W4221156897 hasPublicationYear "2022" @default.
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