Dear Simon and prof. Bangerth Thanks for your kind replies. The issue finally turned out to be that I set a 'smoothness' when I defined the triangulation ( my supervisor found it, he is a deal ii deep lover XD).
I have a further question though. The background is that, I am doing some electromagnetic geophysics simulation based on an octree mesh, and before that, I make a rectangular base mesh (make_grid) using *GridGenerator::subdivided_hyper_rectangle*. For the current case, my mesh size is 41*41*37, it will take 90s to make the grid. Is this time cost reasonable, as I don't feel so.. Best regards, Longying On Thursday, 23 June 2022 at 18:34:42 UTC+3 Wolfgang Bangerth wrote: > On 6/24/22 00:22, LY XXXiao wrote: > > > > I have already a basic mesh with 120 cells, and I only want to refine > one > > element among them, so I set a refine_flag for this element. But the > > refinement does not happen ?? Is there anything else that I missed? I > learned > > step 1 and step 6 for meshing problem. > > > > When you call the constructor of Triangulation, you provide "refinement > flags" > that determine how refinement should happen. If you only mark one cell, > you > would create an "island" of refined cells that has five additional degrees > of > freedom, four of which are hanging nodes. This isn't worth it, and some of > the > refinement flags will specifically avoid this kind of thing. You will want > to > choose flags that allow it. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > www: http://www.math.colostate.edu/~bangerth/ > > -- 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/83f07d27-236c-449f-b9d1-3990f4179555n%40googlegroups.com.
