# [Getdp] Neumann boundary condition

**Luis Saavedra**
luis94855510 at gmail.com

*Wed Mar 19 17:16:34 CET 2008*

Hi Tammo,
my english writing is terrible, but i am thinking about understanding
your problem; in the wiki don't have any example of that (in LaTeX
notation):
\div(\grad u ) = f in \Omega
\frac{\partial u}{\partial n} = g in \Gamma
with the condition for unicity:
\Int_{\Omega} u = 0
warning: a compatibility equation that must be satisfied for the
parameters functions f,g :
\Int_{\Omega} f = \Int_{\Gamma} g
I attach the solution, that example belongs to Alejandro Angulo,
Saludos y buena suerte!!
PS: in that example:
\Omega = B(0,1)
f = 1.0
g = -0.5 (go to compatibility equation)
then u = (1/8) - (r^2)/4
that is named uref.
Tammo.Heeren at AlconLabs.com escribió:
>* How do I assign a Neumann boundary condition?
*>* Is that possible in a Form0 function space?
*>*
*>* Tammo
*>*
*>*
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*>* Thank you.
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