<!-- SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file LICENSE.md in module root SPDX-License-Identifier: LGPL-2.1-or-later --> # dune-uggrid This is a fork of the old [UG](https://doi.org/10.1007/s007910050003) finite element software, wrapped as a Dune module, and stripped of everything but the grid data structure. You need this module if you want to use the `UGGrid` grid implementation from the `dune-grid` module. To use this module, simply have it available when building `dune-grid`. The Dune build system will then pick it up when building `dune-grid`, and the `UGGrid` grid implementation becomes available. ## Features The `UGGrid` grid data structure is very powerful and flexible. Its main features are: * Unstructured two- and three-dimensional grids * Grids with more than one element type: triangles and quadrilaterals in 2d, tetrahedra, hexahedra, prisms and pyramids in 3d * Adaptive red-green refinement, and nonconforming refinement * Anisotropic refinement * Distributed grids on large numbers of processes, connected by MPI * Free-form domain boundaries: Individual grids always have polyhedral boundaries, but refining the grids will approximate the actual (free-form) boundary better and better. The features of `UGGrid` are described in more detail in the [Dune book](https://link.springer.com/book/10.1007/978-3-030-59702-3). ## Planned features The following features are natural next steps in the development of `dune-uggrid`. * Checkpointing: Save the entire grid hierarchy to a file, and read it back in again. * Direct construction of distributed grids (instead of constructing the grid on rank 0 and then distributing) * Two-dimensional grids in a three-dimensional world ## Releases Although technically not a "Dune core module", `dune-uggrid` is released together with the Dune core modules. Starting with version 2.10 you can find `dune-uggrid` release tarballs at the [same site](https://dune-project.org/releases/) as the Dune core module releases. Older release tarballs can be found at the following links: <table> <tr> <th>version</th> <th>source</th> <th>signature</th> </tr> <tr> <td>2.9.1</td> <td><a href="https://dune-project.org/download/2.9.1/dune-uggrid-2.9.1.tar.gz" download>dune-uggrid-2.9.1.tar.gz</a></td> <td><a href="https://dune-project.org/download/2.9.1/dune-uggrid-2.9.1.tar.gz.asc" download>dune-uggrid-2.9.1.tar.gz.asc</a></td> </tr> <tr> <td>2.8.0</td> <td><a href="https://dune-project.org/download/2.8.0/dune-uggrid-2.8.0.tar.gz" download>dune-uggrid-2.8.0.tar.gz</a></td> <td><a href="https://dune-project.org/download/2.8.0/dune-uggrid-2.8.0.tar.gz.asc" download>dune-uggrid-2.8.0.tar.gz.asc</a></td> </tr> </table> ## Maintainer The `dune-uggrid` module is currently maintained by [Oliver Sander](https://tu-dresden.de/mn/math/numerik/sander).