On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities
Discretization of the equations of Viscous Plastic and Elastic Viscous Plastic (EVP) sea ice dynamics on triangular meshes can be done by placing discrete velocities at vertices, cells or edges. Since there are more cells and edges than vertices, the cell- and edge-based discretizations simulate mor...
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ftdatacite:10.48550/arxiv.2106.13641 2023-05-15T18:17:20+02:00 On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities Danilov, S. Mehlmann, C. Fofonova, V. 2021 https://dx.doi.org/10.48550/arxiv.2106.13641 https://arxiv.org/abs/2106.13641 unknown arXiv https://dx.doi.org/10.1016/j.ocemod.2021.101937 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Numerical Analysis math.NA FOS Mathematics article-journal Article ScholarlyArticle Text 2021 ftdatacite https://doi.org/10.48550/arxiv.2106.13641 https://doi.org/10.1016/j.ocemod.2021.101937 2022-03-10T14:52:37Z Discretization of the equations of Viscous Plastic and Elastic Viscous Plastic (EVP) sea ice dynamics on triangular meshes can be done by placing discrete velocities at vertices, cells or edges. Since there are more cells and edges than vertices, the cell- and edge-based discretizations simulate more linear kinematic features at the same mesh than the vertex discretization. However, the discretization based on cell and edge velocities suffer from kernels in the strain rate or stress divergence operators and need either special strain rate computations as proposed here for cell velocities, or stabilization as proposed earlier for edge velocities. An elementary Fourier analysis clarifies how kernels are removed, and also shows that cell and edge velocity placement leads to spurious branches of stress divergence operator with large negative eigenvalues. Although spurious branches correspond to fast decay and are not expected to distort sea ice dynamics, they demand either smaller internal time steps or higher stability parameters in explicit EVP-like methods. Article in Journal/Newspaper Sea ice DataCite Metadata Store (German National Library of Science and Technology) |
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op_collection_id |
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language |
unknown |
topic |
Numerical Analysis math.NA FOS Mathematics |
spellingShingle |
Numerical Analysis math.NA FOS Mathematics Danilov, S. Mehlmann, C. Fofonova, V. On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities |
topic_facet |
Numerical Analysis math.NA FOS Mathematics |
description |
Discretization of the equations of Viscous Plastic and Elastic Viscous Plastic (EVP) sea ice dynamics on triangular meshes can be done by placing discrete velocities at vertices, cells or edges. Since there are more cells and edges than vertices, the cell- and edge-based discretizations simulate more linear kinematic features at the same mesh than the vertex discretization. However, the discretization based on cell and edge velocities suffer from kernels in the strain rate or stress divergence operators and need either special strain rate computations as proposed here for cell velocities, or stabilization as proposed earlier for edge velocities. An elementary Fourier analysis clarifies how kernels are removed, and also shows that cell and edge velocity placement leads to spurious branches of stress divergence operator with large negative eigenvalues. Although spurious branches correspond to fast decay and are not expected to distort sea ice dynamics, they demand either smaller internal time steps or higher stability parameters in explicit EVP-like methods. |
format |
Article in Journal/Newspaper |
author |
Danilov, S. Mehlmann, C. Fofonova, V. |
author_facet |
Danilov, S. Mehlmann, C. Fofonova, V. |
author_sort |
Danilov, S. |
title |
On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities |
title_short |
On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities |
title_full |
On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities |
title_fullStr |
On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities |
title_full_unstemmed |
On discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities |
title_sort |
on discretizing sea-ice dynamics on triangular meshes using vertex, cell or edge velocities |
publisher |
arXiv |
publishDate |
2021 |
url |
https://dx.doi.org/10.48550/arxiv.2106.13641 https://arxiv.org/abs/2106.13641 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://dx.doi.org/10.1016/j.ocemod.2021.101937 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.2106.13641 https://doi.org/10.1016/j.ocemod.2021.101937 |
_version_ |
1766191475653083136 |