Hi deal.ii experts,

I have the following issue and I'd like if you could give me directions 
what to look for.

I'm attaching a figure from two consecutive iterations:
The black line shows how the triangulation is split to different processors.
The red line indicates a Dirichlet boundary condition that happens to start 
exactly at the edge of the cell and spans almost half cell (of the 1st 
iteration).

ITERATION 1

<https://lh3.googleusercontent.com/-tFrSyl1GugA/WoVYmCxSgFI/AAAAAAAAFu4/BfqET6F0me4SpGLa9gUHgPQtfns7XqMlgCEwYBhgL/s1600/Iter1.png>


ITERATION 2

<https://lh3.googleusercontent.com/-fVK1tw5ifWM/WoVY77uLAtI/AAAAAAAAFu8/EN2VpOEiOZYPi9lf5Iocjf9ego3-FMhnwCLcBGAs/s1600/Iter2.png>


You can see that there is an artifact in the solution right where the 
border between the processors and the edge of the boundary conditions is.
If I change slightly the boundary conditions e.g. expand it to the left 
then the solution is getting smooth.

Any advice?

Thank you

Giorgos
  


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