An Adaptive Difference Method for Variable-Order Diffusion Equations
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866912034662121472 |
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| author | Quintana-Murillo, Joaquín Yuste, Santos Bravo |
| author_facet | Quintana-Murillo, Joaquín Yuste, Santos Bravo |
| contents | An adaptive finite difference scheme for variable-order fractional-time subdiffusion equations in the Caputo form is studied. The fractional time derivative is discretized by the L1 procedure but using nonhomogeneous timesteps. The size of these timesteps is chosen by an adaptive algorithm in order to keep the local error bounded around a preset value, a value that can be chosen at will. For some types of problems this adaptive method is much faster than the corresponding usual method with fixed timesteps while keeping the local error of the numerical solution around the preset values. These findings turns out to be similar to those found for constant-order fractional diffusion equations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_12422 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An Adaptive Difference Method for Variable-Order Diffusion Equations Quintana-Murillo, Joaquín Yuste, Santos Bravo Numerical Analysis Statistical Mechanics Computational Physics G.1.9; G.1.4; G.1.0 An adaptive finite difference scheme for variable-order fractional-time subdiffusion equations in the Caputo form is studied. The fractional time derivative is discretized by the L1 procedure but using nonhomogeneous timesteps. The size of these timesteps is chosen by an adaptive algorithm in order to keep the local error bounded around a preset value, a value that can be chosen at will. For some types of problems this adaptive method is much faster than the corresponding usual method with fixed timesteps while keeping the local error of the numerical solution around the preset values. These findings turns out to be similar to those found for constant-order fractional diffusion equations. |
| title | An Adaptive Difference Method for Variable-Order Diffusion Equations |
| topic | Numerical Analysis Statistical Mechanics Computational Physics G.1.9; G.1.4; G.1.0 |
| url | https://arxiv.org/abs/2409.12422 |