Sorry for pestering you, but why does this not happen in "grid-2-single-refine.svg" and "grid-3-coarse.svg"?
On Monday, April 18, 2022 at 9:05:42 PM UTC+5:30 Wolfgang Bangerth wrote: > On 4/16/22 21:40, ankit tyagi wrote: > > *** Caution: EXTERNAL Sender *** > > > > I think the issue is different here. PFA three files corresponding to > > a coarser version of grid-2 mesh. First is the original coarse mesh, > > second with single refinement, and third with two refinements. The > > first refinement doesn't cause any issue, but second does. In the > > first refinement, all cells are inner cells, so appropriate changes > > are made to all the boundaries. But in the second refinement, there > > are outer cells and inner cells, and only the inner cells are > > refined. This causes a contradiction, because the outer and inner > > cells share a boundary: the middle circle. Because of refinement of > > inner cells, they get a new outer boundary, but the outer cells retain > > their inner boundary, creating discontinuities at the middle circle. > > > > This point is further proved if we change the refinement strategy to > > the one mentioned in the "Possibilities for extensions" section. This > > time, all the cells with center lying on the positive y side, > > are refined . Even though boundaries are still curved, it causes no > > issue. PFA "grid-3-coarse.svg" and full code also. > > I see no contradiction to my earlier statements. The only edges that are > affected by the use of a curved manifold description are the ones that are > in > circumferential direction, and in your pictures, these are exactly the > ones > that have the funny appearance. The manifold is chosen in such a way that > all > radial edges are in fact straight, and so whenever there is a hanging node > along such an edge, the two child edges geometrically cover the parent > edge > exactly. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/ecec5bbf-a550-45d0-80e9-6f8e29428fb3n%40googlegroups.com.
