Piecewise discretization of monodromy operators of delay equations on adapted meshes
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866909581893959680 |
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| author | Breda, Dimitri Liessi, Davide Vermiglio, Rossana |
| author_facet | Breda, Dimitri Liessi, Davide Vermiglio, Rossana |
| contents | Periodic solutions of delay equations are usually approximated as continuous piecewise polynomials on meshes adapted to the solutions' profile. In practical computations this affects the regularity of the (coefficients of the) linearized system and, in turn, the effectiveness of assessing local stability by approximating the Floquet multipliers. To overcome this problem when computing multipliers by collocation, the discretization grid should include the piecewise adapted mesh of the computed periodic solution. By introducing a piecewise version of existing pseudospectral techniques, we explain why and show experimentally that this choice is essential in presence of either strong mesh adaptation or nontrivial multipliers whose eigenfunctions' profile is unrelated to that of the periodic solution. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2203_11839 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Piecewise discretization of monodromy operators of delay equations on adapted meshes Breda, Dimitri Liessi, Davide Vermiglio, Rossana Numerical Analysis 65L03, 65L07, 65L15, 65R15 (Primary) Periodic solutions of delay equations are usually approximated as continuous piecewise polynomials on meshes adapted to the solutions' profile. In practical computations this affects the regularity of the (coefficients of the) linearized system and, in turn, the effectiveness of assessing local stability by approximating the Floquet multipliers. To overcome this problem when computing multipliers by collocation, the discretization grid should include the piecewise adapted mesh of the computed periodic solution. By introducing a piecewise version of existing pseudospectral techniques, we explain why and show experimentally that this choice is essential in presence of either strong mesh adaptation or nontrivial multipliers whose eigenfunctions' profile is unrelated to that of the periodic solution. |
| title | Piecewise discretization of monodromy operators of delay equations on adapted meshes |
| topic | Numerical Analysis 65L03, 65L07, 65L15, 65R15 (Primary) |
| url | https://arxiv.org/abs/2203.11839 |