Abstract
The nonlinear modified anomalous sub-diffusion model characterizes processes that become less anomalous as time progresses by including a second fractional time derivative acting on the term of diffusion. This paper introduces a radial basis function-generated finite difference (RBF-FD) method for solving the governing problem. The Grünwald–Letnikov formula with first-order accuracy is implemented to discretize the problem in the time direction, and the spatial variable is discretized using the local RBF-FD method. The convergence and stability of the time discretization scheme are deduced in an appropriate Sobolev space. The data distribution pattern within the support domain is considered to have a constant number of points. The numerical results on regular and irregular domains show the efficiency and high accuracy of the method and confirm the theoretical prediction.
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Nikan, O., Tenreiro Machado, J.A., Golbabai, A. et al. Numerical investigation of the nonlinear modified anomalous diffusion process. Nonlinear Dyn 97, 2757–2775 (2019). https://doi.org/10.1007/s11071-019-05160-w
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DOI: https://doi.org/10.1007/s11071-019-05160-w
Keywords
- Riemann–Liouville fractional derivative
- Modified anomalous sub-diffusion model
- RBF-FD
- Stability
- Convergence