Dear Dr. Arndt,
Thank you very much for your help. The problem was resolved applying your
comment. I was setting the indicators running over locally owned cells not
all the cells.
On Saturday, February 17, 2018 at 11:20:32 AM UTC-6, Daniel Arndt wrote:
> for collecting the periodic boundary pairs only the coarsest level is
> In particular, you have to make sure that you set the boundary indicators
> correctly for all cells on this level.
> For the coarsest level every MPI process knows about all the cells since
> the mesh is the same for all processes.
> Summarizing: Simply run over all the cells when setting the boundary
> indicators and not only the ones that are locally owned.
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