[dune-fem] Neuman boundary conditions

[Andreas Dedner]

Hi Justus.
Welcome to dune and dune-fem.
In that example "Neumann boundary conditions" refers to "trivial Neumann
boundary conditions", i.e., nabla u.n = 0. Not very well formulated I
agree...
Now the releases/2.4 branch of the howto includes non trivial Neumann
b.c. Look at 04.poisson-2/source/model.hh and poisson.hh
class CosinusProductMixedBC (that example is actually for Robin b.c.).
It might still be missing in the documentation.
Hope that helps and if not just keep asking
Andreas


On 12/03/16 15:15, Schock, Justus wrote:
> Dear Duners,
> 
> 
> 
> I tried to work through the tutorial and understand the delivered code.
> 
> 
> Section "9.1 Introduction" in Chapter "9 Linear Solvers" claims that in
> "class CosinusProduct" of "poisson.hh" ​should be an implementation of
> neuman boundary conditions and the comments in the code state the same. 
> 
> 
> For the Dirichlet boundary conditions exists an explicit function where
> the Dirichlet boundary data could be set. For the Neuman boundary
> condition there is no function.
> 
> 
> Could anyone please tell me, how the Neuman boundary condition data
> could be set?
> 
> 
> 
> Sincerely
> 
> ​Justus Schock
> 
> 
> 
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