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.

Best regards,

On Saturday, February 17, 2018 at 11:20:32 AM UTC-6, Daniel Arndt wrote:
> Hamed,
> for collecting the periodic boundary pairs only the coarsest level is 
> important. 
> 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.
> Best,
> Daniel

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