Geometric analysis of fast-slow PDEs with fold singularities via Galerkin discretisation
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2022
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| _version_ | 1866913543674134528 |
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| author | Engel, Maximilian Hummel, Felix Kuehn, Christian Popović, Nikola Ptashnyk, Mariya Zacharis, Thomas |
| author_facet | Engel, Maximilian Hummel, Felix Kuehn, Christian Popović, Nikola Ptashnyk, Mariya Zacharis, Thomas |
| contents | We study a singularly perturbed fast-slow system of two partial differential equations (PDEs) of reaction-diffusion type on a bounded domain via Galerkin discretisation. We assume that the reaction kinetics in the fast variable realise a generic fold singularity, whereas the slow variable takes the role of a dynamic bifurcation parameter, thus extending the classical analysis of the singularly perturbed fold. Our approach combines a spectral Galerkin discretisation with techniques from geometric singular perturbation theory which are applied to the resulting high-dimensional systems of ordinary differential equations. In particular, we show the existence of invariant slow manifolds in the phase space of the original system of PDEs away from the fold singularity, while the passage past the singularity of the Galerkin manifolds obtained after discretisation is described by geometric desingularisation, or blow-up. Finally, we discuss the relation between these Galerkin manifolds and the underlying slow manifolds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2207_06134 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Geometric analysis of fast-slow PDEs with fold singularities via Galerkin discretisation Engel, Maximilian Hummel, Felix Kuehn, Christian Popović, Nikola Ptashnyk, Mariya Zacharis, Thomas Analysis of PDEs Dynamical Systems 35B25, 35K57, 34Cxx, 34D15, 34E15, 37G10 We study a singularly perturbed fast-slow system of two partial differential equations (PDEs) of reaction-diffusion type on a bounded domain via Galerkin discretisation. We assume that the reaction kinetics in the fast variable realise a generic fold singularity, whereas the slow variable takes the role of a dynamic bifurcation parameter, thus extending the classical analysis of the singularly perturbed fold. Our approach combines a spectral Galerkin discretisation with techniques from geometric singular perturbation theory which are applied to the resulting high-dimensional systems of ordinary differential equations. In particular, we show the existence of invariant slow manifolds in the phase space of the original system of PDEs away from the fold singularity, while the passage past the singularity of the Galerkin manifolds obtained after discretisation is described by geometric desingularisation, or blow-up. Finally, we discuss the relation between these Galerkin manifolds and the underlying slow manifolds. |
| title | Geometric analysis of fast-slow PDEs with fold singularities via Galerkin discretisation |
| topic | Analysis of PDEs Dynamical Systems 35B25, 35K57, 34Cxx, 34D15, 34E15, 37G10 |
| url | https://arxiv.org/abs/2207.06134 |