An RBF partition of unity method for geometry reconstruction and PDE solution in thin structures
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866911788048580608 |
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| author | Larsson, Elisabeth Villard, Pierre-Frédéric Tominec, Igor Sundin, Ulrika Michael, Andreas Cacciani, Nicola |
| author_facet | Larsson, Elisabeth Villard, Pierre-Frédéric Tominec, Igor Sundin, Ulrika Michael, Andreas Cacciani, Nicola |
| contents | The main respiratory muscle, the diaphragm, is an example of a thin structure. We aim to perform detailed numerical simulations of the muscle mechanics based on individual patient data. This requires a representation of the diaphragm geometry extracted from medical image data. We design an adaptive reconstruction method based on a least-squares radial basis function partition of unity method. The method is adapted to thin structures by subdividing the structure rather than the surrounding space, and by introducing an anisotropic scaling of local subproblems. The resulting representation is an infinitely smooth level set function, which is stabilized such that there are no spurious zero level sets. We show reconstruction results for 2D cross sections of the diaphragm geometry as well as for the full 3D geometry. We also show solutions to basic PDE test problems in the reconstructed geometries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_01486 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An RBF partition of unity method for geometry reconstruction and PDE solution in thin structures Larsson, Elisabeth Villard, Pierre-Frédéric Tominec, Igor Sundin, Ulrika Michael, Andreas Cacciani, Nicola Numerical Analysis 65N35 (Primary) 65N12 (Secondary) The main respiratory muscle, the diaphragm, is an example of a thin structure. We aim to perform detailed numerical simulations of the muscle mechanics based on individual patient data. This requires a representation of the diaphragm geometry extracted from medical image data. We design an adaptive reconstruction method based on a least-squares radial basis function partition of unity method. The method is adapted to thin structures by subdividing the structure rather than the surrounding space, and by introducing an anisotropic scaling of local subproblems. The resulting representation is an infinitely smooth level set function, which is stabilized such that there are no spurious zero level sets. We show reconstruction results for 2D cross sections of the diaphragm geometry as well as for the full 3D geometry. We also show solutions to basic PDE test problems in the reconstructed geometries. |
| title | An RBF partition of unity method for geometry reconstruction and PDE solution in thin structures |
| topic | Numerical Analysis 65N35 (Primary) 65N12 (Secondary) |
| url | https://arxiv.org/abs/2403.01486 |