Hi Amit, If you are interested in using symmetry then I suspect you may also want to use periodic boundary conditions on the "internal" faces of the octant. For an example of how this works (e.g., periodic boundary conditions containing a rotation) check out step-45:
https://dealii.org/developer/doxygen/deal.II/step_45.html Best, David ________________________________ From: dealii@googlegroups.com <dealii@googlegroups.com> on behalf of Bruno Turcksin <bruno.turck...@gmail.com> Sent: Friday, June 24, 2022 9:33 AM To: deal.II User Group <dealii@googlegroups.com> Subject: Re: [deal.II] Can I use 3D prism elements (extruded triangles) in deal.ii? Amit, I think that GridGenerator::quarter_hyper_shell<https://dealii.org/current/doxygen/deal.II/namespaceGridGenerator.html#acd7c51b0e8032db65db9a5ff73ccca50> is what you want. Best, Bruno On Friday, June 24, 2022 at 9:02:11 AM UTC-4 Paras Kumar wrote: HI Amit, Focusing on the question of mesh generation, it is possible to generate an automated HEX mesh using Gmsh, but since that mesh is based on Delaunay based approaches, quality may not be very good. See discussions in this thread: https://groups.google.com/g/dealii/c/o_xXAur2Ao8/m/vlAjFs5ECQAJ Alternatively, if you just want to mesh this specific geometry, you could also get a structured (good looking) HEX mesh using the transfinite mesh approach available in Gmsh. In my limited knowledge, cf. [https://www.dealii.org/current/doxygen/deal.II/group__simplex.html], it seems that the simplex support is still experimental. As mentioned in the link, it might be helpful to look at the tests/simplex folder. The developers can maybe provide more precise answer here. Best, Paras On Fri, Jun 24, 2022 at 2:19 PM Amit Singh <amit1...@gmail.com> wrote: Hi. I am considering deal.ii for some nonlinear elasticity and fracture analysis. >From what I read in the documentation, deal.ii supports hexahedral elements >much better than tetrahedral elements. My geometry looks as shown in the >attached picture. The actual geometry is a boolean difference of a big sphere >and a small sphere. But to exploit symmetry I am considering only one-eighth >of the sphere. I am struggling to create a mesh that has only hexahedral elements. The best I was able to attain was a vast majority of the elements were hexahedral but there were some prism elements at the poles. Therefore, my question is can I use prism elements in deal.ii? (Or if there is a clever way to mesh this geometry with just hexahedral elements kindly let me know.) Regards, Amit -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+un...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/cd269727-64aa-4079-b261-657e9dc0248an%40googlegroups.com<https://groups.google.com/d/msgid/dealii/cd269727-64aa-4079-b261-657e9dc0248an%40googlegroups.com?utm_medium=email&utm_source=footer>. -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com<mailto:dealii+unsubscr...@googlegroups.com>. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/b750db66-e63d-488b-823f-8d454276da03n%40googlegroups.com<https://groups.google.com/d/msgid/dealii/b750db66-e63d-488b-823f-8d454276da03n%40googlegroups.com?utm_medium=email&utm_source=footer>. -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/MN2PR03MB4879F0A59961A3C84D5119B2EDB49%40MN2PR03MB4879.namprd03.prod.outlook.com.
