David, could you try out the following PR: https://github.com/dealii/dealii/pull/11784 Not sure if the issue there is related. If not, could you post a vtk/vtu file and I'll read it with my Paraview version.
Peter On Tuesday, 23 February 2021 at 09:07:57 UTC+1 daschn...@googlemail.com wrote: > Hi Wolfgang, > > > I have to admit that I don't know how to address this because I don't > know nor > > use Paraview. As mentioned before, it would be useful to obtain the > smallest > > possible testcase that reproduces the problem -- minimal number of > processors, > > minimal number of cells. > > I already tried to answer this question above since Alexander asked the > same question (not sure why his message has been deleted): > > > Yes, I can reproduce it on 2 procs and I can also simplify the mesh to a > size of four cells on a rectangle. The problem vanishes if I select linear > shape functions or zero nonlinear subdivisions in paraView (which is > probably the same). > > [image: coarse_mesh_distorted.png] > > > If I increase the nonlinear subdivision setting in paraVIew to four (as > opposed to the default one), it looks as follows: > > [image: coarse_mesh_four_subd.png] > > > Does it help? > Regards, > David > > Wolfgang Bangerth schrieb am Montag, 22. Februar 2021 um 20:10:05 UTC+1: > >> On 2/18/21 6:39 AM, 'David' via deal.II User Group wrote: >> > >> > the problem here is independent of any data set. So, you can also see >> it in >> > paraView in the 'solid color' block. It seems to be an artificial >> curvature >> > within the element. >> > To my best knowledge it is not required to update any geometry related >> data. >> >> I have to admit that I don't know how to address this because I don't >> know nor >> use Paraview. As mentioned before, it would be useful to obtain the >> smallest >> possible testcase that reproduces the problem -- minimal number of >> processors, >> minimal number of cells. >> >> Best >> Wolfgang >> >> -- >> ------------------------------------------------------------------------ >> 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/1d13c760-0972-450f-a553-b26f2b2fb7den%40googlegroups.com.
