Benhour,

Have a look at the implementation of GridGenerator::half_hyper_ball [1]. 
You probably just want to use the first 4 vertices and then 
p,
p+Point<2>(0,-1) *(radius/std::sqrt(2.0)*a),
p+Point<2>(0,-1) *radius,
additionally.

Can you specify in formulas what symmetry boundary conditions mean for you?

Best,
Daniel


[1] 
https://www.dealii.org/developer/doxygen/deal.II/grid__generator_8cc_source.html

Am Donnerstag, 7. Juli 2016 00:08:29 UTC+2 schrieb benhour....@gmail.com:
>
> Dear All,
> I want to define a new geometry (a quarter of a circle) and apply symmetry 
> boundary condition on two sides of the quarter. It would be very kind of 
> you if you help me for that.
>
> Best,
> Benhour
>

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