Hi all,
After I solve my PDE for the solution u, I want to compute the integral
\int_\Gamma ( \partial{u} / \partial{n} )^2 ds
where \Gamma is the domain boundary. I have the discrete solution u^h as a
vector of values; is there a function in the library that helps with this? I
have looked in VectorTools but could not find something that calculates
integrals of directional derivatives (it does not fit the scope of the class I
guess). How would a quadrature calculation look like? I would have to iterate
over each DG element that has a face on the boundary, get the quadrature
points/weights, and then sum-up the boundary integral by hand?
Could I find something helpful in one of the tutorial examples?
Thanks!
-- M
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