Thank you very much for your answer. I have watched your tutorial videos to 
learn how to implement the problem but actually I have difficulties to 
input my own geometry in dealii and refine the certain line that I need 
to.Currently I play with the step-1 and step-12 again, which implements the 
refinement but as I said I have to change both the direction of the 
refinement and the geometry.Could I find somewhere in the tutorials how to 
do them? Thank you.

Best regards
Reza

Am Mittwoch, 22. Juni 2016 19:35:36 UTC+2 schrieb bangerth:
>
>
> >     currently I do my master thesis and firstly I have to do adaptive 
> mesh 
> >     refinement for a brittle fracture in 2D using a phase-field approach 
> but 
> >     with my own geometry. I would like to ask you how can I input my 
> geometry 
> >     in dealii-8.4.1, which version I use and how can I command that only 
> the 
> >     area has to be refined, which is cracked. 
>
> Others have already commented on how to refine the mesh based on computed 
> criteria. A possibly simpler approach would be to refine by hand certain 
> cells, if you know where the cracked region is (or all cells that are 
> within a 
> certain distance of the crack). This is what is done in step-1, for 
> example. 
>
> Best 
>   W. 
>
>
> -- 
> ------------------------------------------------------------------------ 
> Wolfgang Bangerth               email:            [email protected] 
> <javascript:> 
>                                  www: http://www.math.tamu.edu/~bangerth/ 
>
>

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