Reply To: Grid refinement
Can you provide a sketch of your refinement domain?
In general, BCs crossing the refinement frontier can be an issue. The BCs between the adjacent resolution levels need to be consistent and coupling needs to either take them into account or be disabled on the actual BC cells (common).
We have also been increasing the updates to the public Git repository lately. Amongst other things there is now also an implementation of the cell-centered approach by Rohde that you might want to check out.