Dear Anup,

Its possible that this is related to this issue 
<https://github.com/dealii/dealii/issues/2206>. Do you perhaps have a 
minimal test case that reproduces the problem?

Best,
Jean-Paul

On Saturday, January 21, 2017 at 4:07:00 AM UTC+1, Anup Basak wrote:
>
> Hello all,
>
> I have solved a 2D mechanics (thermoelasticity) problem based on step 44 
> using quadratic elements (FE_Q). When I plot the solution in the deformed 
> configuration (attached herewith) I see that at one place discontinuity 
> gets developed between two elements (Fig. in page 2) and at some other 
> place two elements overlap (Fig. in page 3). I have shown the locations in 
> the figure of page 1.  However, when linear elements are used, this problem 
> does not appear. In both the cases I get sufficient convergence.  I have 
> confirmed this issue with both Visit and Paraview. I never encountered such 
> strange problem while solving 3D problems. Hence it might be an issue 
> related to post-processing.
>
> Has anyone encountered such problem in the past? I shall be thankful if 
> someone could tell me what might go wrong.
>
> Thanks and regards,
> Anup.
>

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