Hello Earl, It's good to know I am not the only one from the machine area trying to use deal.ii ;)
Actually I was planning to use gmsh given my understanding of the deal.ii package. Again, it's good to have a confirmation from you. Best Regards, Baoyun On Wednesday, June 5, 2019 at 12:02:08 AM UTC-5, Earl Fairall wrote: > > Dear Baoyun, > > I too have been looking at this exact application. Building the mesh in > deal.ii is difficult. Deal.ii only has some very fundamental shapes which > require the use of boolean operations for increased complexity. This in > itself is not challenging. The challenge is that the mesh nodes must line > up exactly. This really requires a function which moves/merges/places nodes > manually (i'm not sure if Deal.ii has such a "healing" function) or else an > automatic mesh generator is required. I have, at least temporarily, given > up on Deal.ii meshing and started looking at Gmsh as a possible option for > automatic mesh generation, but I would rather stay within the deal.ii > framework if I can figure it out! > > Earl > > > On Tue, Jun 4, 2019 at 7:37 PM Baoyun Ge <[email protected] > <javascript:>> wrote: > >> Hi Daniel >> >> Thanks for your prompt response and guidelines. After going through these >> examples, I have a better understanding now. >> >> Best, >> Baoyun >> >> On Sunday, June 2, 2019 at 7:54:16 PM UTC-5, Daniel Arndt wrote: >>> >>> Bayon, >>> >>> What's the most appropriate/easiest way to setup the matrix for such a >>>> multi-domain problem in the dealii programming environment? >>>> >>> >>> Essentially, you are solving a Laplace problem with discontinuous >>> coefficients. In case, there are no interface conditions between the >>> different materials, >>> you should be good to just look at step-6 (and the previous tutorial >>> programs of course) to begin with. For periodic boundary consitionsyou >>> might want to have a look at step-45. >>> >>> >>>> In an actual electric machine, the air region is very thin, resulting a >>>> large aspect ratio. What's the most appropriate way to mesh this region? >>>> >>> >>> We provide generators for a bunch of meshes in the GridGenerator >>> namespace. In you case, I would make sure that each materials are not cut >>> by cells. >>> You might want to merge triangulations via >>> GridGenerator::merge_triangulations. With respect to the thin air region >>> anisotropic refinement might be interesting (see >>> https://www.dealii.org/current/doxygen/deal.II/step_30.html) >>> if you can't afford a suitably (isotropically) globally refined mesh. >>> >>> Best, >>> Daniel >>> >> >> On Sunday, June 2, 2019 at 7:54:16 PM UTC-5, Daniel Arndt wrote: >>> >>> Bayon, >>> >>> What's the most appropriate/easiest way to setup the matrix for such a >>>> multi-domain problem in the dealii programming environment? >>>> >>> >>> Essentially, you are solving a Laplace problem with discontinuous >>> coefficients. In case, there are no interface conditions between the >>> different materials, >>> you should be good to just look at step-6 (and the previous tutorial >>> programs of course) to begin with. For periodic boundary consitionsyou >>> might want to have a look at step-45. >>> >>> >>>> In an actual electric machine, the air region is very thin, resulting a >>>> large aspect ratio. What's the most appropriate way to mesh this region? >>>> >>> >>> We provide generators for a bunch of meshes in the GridGenerator >>> namespace. In you case, I would make sure that each materials are not cut >>> by cells. >>> You might want to merge triangulations via >>> GridGenerator::merge_triangulations. With respect to the thin air region >>> anisotropic refinement might be interesting (see >>> https://www.dealii.org/current/doxygen/deal.II/step_30.html) >>> if you can't afford a suitably (isotropically) globally refined mesh. >>> >>> Best, >>> Daniel >>> >> >> On Sunday, June 2, 2019 at 7:54:16 PM UTC-5, Daniel Arndt wrote: >>> >>> Bayon, >>> >>> What's the most appropriate/easiest way to setup the matrix for such a >>>> multi-domain problem in the dealii programming environment? >>>> >>> >>> Essentially, you are solving a Laplace problem with discontinuous >>> coefficients. In case, there are no interface conditions between the >>> different materials, >>> you should be good to just look at step-6 (and the previous tutorial >>> programs of course) to begin with. For periodic boundary consitionsyou >>> might want to have a look at step-45. >>> >>> >>>> In an actual electric machine, the air region is very thin, resulting a >>>> large aspect ratio. What's the most appropriate way to mesh this region? >>>> >>> >>> We provide generators for a bunch of meshes in the GridGenerator >>> namespace. In you case, I would make sure that each materials are not cut >>> by cells. >>> You might want to merge triangulations via >>> GridGenerator::merge_triangulations. With respect to the thin air region >>> anisotropic refinement might be interesting (see >>> https://www.dealii.org/current/doxygen/deal.II/step_30.html) >>> if you can't afford a suitably (isotropically) globally refined mesh. >>> >>> Best, >>> Daniel >>> >> -- >> 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 [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/dealii/e4082fe9-dcab-46cc-b38e-1adc87808733%40googlegroups.com >> >> <https://groups.google.com/d/msgid/dealii/e4082fe9-dcab-46cc-b38e-1adc87808733%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- 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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