How to write the following three dimensions boundary condition in FreeFEM++?
whre J=[0,T] is the time.
This depend strongly of your formulation ans the finite element
Other wise you can make penalization.
I do not quite understand. Are there any examples available for me to learn from?
The problem dépend of your variational formulation , of your equation and of your finite element
See maxwell exemple
Where can I find the Maxwell example?