Thank you very much for your replies Paras, and David! @Bruno: Yes that is indeed what I am looking for! @Chen: Awesome! Thank you very much for sharing the trick.
The deal.ii community is so amazing and helpful! Best, Amit On Friday, June 24, 2022 at 10:56:35 PM UTC+5:30 hkch...@gmail.com wrote: > Hi Amit, > To generate hexahedral mesh, in Gmsh, you can split the volume into three > part like this ,and use transfinite command on curve, surface and volume, > and recombine the surface to get the hexahedral cell. > > Best > Chen > [image: 截屏2022-06-25 上午1.25.00.png] > 在2022年6月24日星期五 UTC+8 22:00:16<Wells, David> 写道： > >> 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:* dea...@googlegroups.com <dea...@googlegroups.com> on behalf of >> Bruno Turcksin <bruno.t...@gmail.com> >> *Sent:* Friday, June 24, 2022 9:33 AM >> *To:* deal.II User Group <dea...@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+un...@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. 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