Dear Daniel and Wolfgang,
Thank you very much! In fact, I only want the gradient of periodic, not the
Dirichlet periodic boundary. I thought they are same in periodic boundary
conditions before, i.e. all informations of the solution on the face pairs
are same. Now, I get that I have made mistak
Dear all,
I would be most grateful for your help on the following matter. I am
solving a combined stokes-laplace problem (have a vector valued solution).
I am trying to calculate the hdiv norm on the first two components of my
solution (i.e. the two components of the velocity), cellwise.
But if "periodic boundary condition" means that all information of solution on
periodic faces pair are equal, not only the value of solution (like Dirichlet
boundary condition above), but also gradient value of solution (like Neuman
boundary condition, as normal vector is opposite, so ifgrad_
