Transformations for Piola-mapped elements
The Arnold–Winther element successfully discretizes the Hellinger–Reissner variational formulation of linear elasticity; its development was one of the key early breakthroughs of the finite element exterior calculus. Despite its great utility, it is not available in standard finite element software,...
| Príomhchruthaitheoirí: | , , |
|---|---|
| Formáid: | Journal article |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
SMAI
2023
|
| _version_ | 1826311121773002752 |
|---|---|
| author | Aznaran, FRA Farrell, P Kirby, R |
| author_facet | Aznaran, FRA Farrell, P Kirby, R |
| author_sort | Aznaran, FRA |
| collection | OXFORD |
| description | The Arnold–Winther element successfully discretizes the Hellinger–Reissner variational formulation of linear elasticity; its development was one of the key early breakthroughs of the finite element exterior calculus. Despite its great utility, it is not available in standard finite element software, because its degrees of freedom are not preserved under the standard Piola push-forward. In this work we apply the novel transformation theory recently developed by Kirby [<i>SMAI J. Comput. Math.</i>, 4:197–224, 2018] to devise the correct map for transforming the basis on a reference cell to a generic physical triangle. This enables the use of the Arnold–Winther elements, both conforming and nonconforming, in the widely-used Firedrake finite element software, composing with its advanced symbolic code generation and geometric multigrid functionality. Similar results also enable the correct transformation of the Mardal–Tai–Winther element for incompressible fluid flow. We present numerical results for both elements, verifying the correctness of our theory. |
| first_indexed | 2024-03-07T08:03:42Z |
| format | Journal article |
| id | oxford-uuid:7d0c33df-c030-44b8-8847-a148d81693bb |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:03:42Z |
| publishDate | 2023 |
| publisher | SMAI |
| record_format | dspace |
| spelling | oxford-uuid:7d0c33df-c030-44b8-8847-a148d81693bb2023-10-13T09:15:52ZTransformations for Piola-mapped elementsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7d0c33df-c030-44b8-8847-a148d81693bbEnglishSymplectic ElementsSMAI2023Aznaran, FRAFarrell, PKirby, RThe Arnold–Winther element successfully discretizes the Hellinger–Reissner variational formulation of linear elasticity; its development was one of the key early breakthroughs of the finite element exterior calculus. Despite its great utility, it is not available in standard finite element software, because its degrees of freedom are not preserved under the standard Piola push-forward. In this work we apply the novel transformation theory recently developed by Kirby [<i>SMAI J. Comput. Math.</i>, 4:197–224, 2018] to devise the correct map for transforming the basis on a reference cell to a generic physical triangle. This enables the use of the Arnold–Winther elements, both conforming and nonconforming, in the widely-used Firedrake finite element software, composing with its advanced symbolic code generation and geometric multigrid functionality. Similar results also enable the correct transformation of the Mardal–Tai–Winther element for incompressible fluid flow. We present numerical results for both elements, verifying the correctness of our theory. |
| spellingShingle | Aznaran, FRA Farrell, P Kirby, R Transformations for Piola-mapped elements |
| title | Transformations for Piola-mapped elements |
| title_full | Transformations for Piola-mapped elements |
| title_fullStr | Transformations for Piola-mapped elements |
| title_full_unstemmed | Transformations for Piola-mapped elements |
| title_short | Transformations for Piola-mapped elements |
| title_sort | transformations for piola mapped elements |
| work_keys_str_mv | AT aznaranfra transformationsforpiolamappedelements AT farrellp transformationsforpiolamappedelements AT kirbyr transformationsforpiolamappedelements |