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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.14772 |
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| _version_ | 1866917019632271360 |
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| author | Di Pietro, Daniele Droniou, Jérôme Nilsson, Erik |
| author_facet | Di Pietro, Daniele Droniou, Jérôme Nilsson, Erik |
| contents | We introduce the cut finite element method in the language of finite element exterior calculus, by formulating a stabilisation -- for any form degree -- that makes the method robust with respect to the position of the interface relative to the mesh. We prove that the $L^2$-norm on the physical domain augmented with this stabilisation is uniformly equivalent to the $L^2$-norm on the ``active'' mesh that contains all the degrees of freedom of the finite element space (including those external to the physical domain). We show how this CutFEEC method can be applied to discretize the Hodge Laplace equations on an unfitted mesh, in any dimension and any topology. A numerical illustration is provided involving a conforming finite element space of $H^{\text{curl}}$ posed on a filled torus, with convergence and condition number scaling independent of the position of the boundary with respect to the background mesh. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_14772 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ghost stabilisation for cut finite element exterior calculus Di Pietro, Daniele Droniou, Jérôme Nilsson, Erik Numerical Analysis 65N30, 14F40 We introduce the cut finite element method in the language of finite element exterior calculus, by formulating a stabilisation -- for any form degree -- that makes the method robust with respect to the position of the interface relative to the mesh. We prove that the $L^2$-norm on the physical domain augmented with this stabilisation is uniformly equivalent to the $L^2$-norm on the ``active'' mesh that contains all the degrees of freedom of the finite element space (including those external to the physical domain). We show how this CutFEEC method can be applied to discretize the Hodge Laplace equations on an unfitted mesh, in any dimension and any topology. A numerical illustration is provided involving a conforming finite element space of $H^{\text{curl}}$ posed on a filled torus, with convergence and condition number scaling independent of the position of the boundary with respect to the background mesh. |
| title | Ghost stabilisation for cut finite element exterior calculus |
| topic | Numerical Analysis 65N30, 14F40 |
| url | https://arxiv.org/abs/2510.14772 |