Hi Dragan,

What is it that you're trying to evaluate? Although you don't specifically 
mention it, as you're wanting to do this in post-processing I presume that 
you're wanting to evaluate something to do with the solution? If so, then 
you can use the get_function_values 
<https://www.dealii.org/developer/doxygen/deal.II/classFEValuesBase.html#a3f84ee49f0fbb32bfe01b2f4a473bb47>
 and get_function_gradients 
<https://www.dealii.org/developer/doxygen/deal.II/classFEValuesBase.html#a69c63f8be0311c8970253276ac7df138>
 
associated with the FEFaceValues 
<https://www.dealii.org/developer/doxygen/deal.II/classFEFaceValues.html> 
class to extract the solution at the face quadrature points.

As a further example, in step-44 
<https://www.dealii.org/developer/doxygen/deal.II/step_44.html> a boundary 
integral is evaluated to compute the nodal contributions of a force applied 
to a surface of a body.

I hope this helps.
J-P

On Friday, September 23, 2016 at 6:29:37 PM UTC+2, dragniko...@gmail.com 
wrote:
>
> Hello guys,
>
> I searched the forum about how to calculate the surface integral over a 
> boundary (during the post-processing) and found one post, where he was 
> directed to the step-12. I am not sure if I can understand from there.
> Any directions how to do it or some other place to look?
> Thanks.
>
> Dragan
>

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