Abstract
The main aim of this paper is to construct an efficient Galerkin–Legendre spectral approximation combined with a finite difference formula of L1 type to numerically solve the generalized nonlinear fractional Schrödinger equation with both space- and time-fractional derivatives. We discretize the Riesz space-fractional derivative using the Legendre–Galerkin spectral method and the time-fractional derivative using the L1 scheme on nonuniform meshes. The stability and convergence analyses of the numerical scheme are studied in detail. The scheme is unconditionally stable and convergent of \(\min \{\kappa \theta ,2-\theta \}\) order convergence in time and of spectral accuracy in space, where \(\theta \) is the order of fractional derivative and \(\kappa \) is the grading mesh parameter. To verify the efficiency of the proposed algorithm, two numerical test problems are performed with convergence and error analysis.
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Acknowledgements
The authors wish to thank the editor-in-chief Professor YangQuan Chen and the anonymous referees for their comments and criticism. All of their comments were taken into account in the revised version of the paper, resulting in a substantial improvement with respect to the original submission. Ahmed S. Hendy wishes to acknowledge the support of RFBR Grant 19-01-00019. Mahmoud A. Zaky wishes to acknowledge the financial support of the National Research Centre of Egypt (NRC).
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Hendy, A.S., Zaky, M.A. Combined Galerkin spectral/finite difference method over graded meshes for the generalized nonlinear fractional Schrödinger equation. Nonlinear Dyn 103, 2493–2507 (2021). https://doi.org/10.1007/s11071-021-06249-x
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DOI: https://doi.org/10.1007/s11071-021-06249-x