Daniel,
Thanks very much for your help. For improving my knowledge and information, 
It would be very kind of you if you let me know why my code does not 
produce right geometry and which part is wrong.

Sincerely,
Benhour

On Sunday, July 17, 2016 at 7:10:41 AM UTC-5, Daniel Arndt wrote:
>
> Benhour,
>
> you can find a modification of step-3 in which the domain is a quarter 
> circle attached.
> The four cells from GridGenerator::half_hyper_ball have been replaced by 
> just three. 
> The vertex (0,-radius) has been removed and all the remaining vertices
> with a negative y-component have been moved to y=0 while keeping the 
> x-component.
> Finally, the inner vertices have been moved a bit to increase the quality 
> of the mesh.
>
> You see that the modifications really are minor.
>
> Best,
> Daniel
>

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