On 11/01/2016 11:06 PM, Jaekwang Kim wrote:

do you have any other idea?


Output the errors per cell and visualize. Is there a pattern? Is the error localized on the boundary, for example?

Best
 W.

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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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