Abstract
The aim of this paper is to implement the high-order local discontinuous Galerkin method (LDGM) for solving partial integro-differential equations (PIDEs) in two dimensions. Time marching method and the transform-based method known as the non-time marching method can be used to discretize temporal terms. The combination of a small time step size in time marching methods and a high-order scheme in space with many degrees of freedom requires a considerable amount of computational time. In order to address this limitation, we propose an algorithm based on a combination of the Laplace transform and LDGM for solving fourth-order time-fractional (TF) PIDEs with weakly singular kernels. Unlike time-marching approaches, the transform-based method has a much lower computational complexity and can take advantage of parallel computing. A numerical experiment validates the accuracy and applicability of the proposed temporal discretization approach and also shows that k-degree LDG solutions have a \(k + 1\) convergence rate.

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Mohammadi-Firouzjaei, H., Adibi, H. & Dehghan, M. Computational study based on the Laplace transform and local discontinuous Galerkin methods for solving fourth-order time-fractional partial integro-differential equations with weakly singular kernels. Comp. Appl. Math. 43, 324 (2024). https://doi.org/10.1007/s40314-024-02813-4
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DOI: https://doi.org/10.1007/s40314-024-02813-4
Keywords
- Fourth-order time-fractional partial integro-differential equation
- Weakly singular kernel
- Laplace transform method
- Local discontinuous Galerkin (LDG) method