In the "heat equation simple" example,
I'm working with code that uses phi_old.FillBoundary(geom.periodicity()); to fill the periodic boundary conditions (BCs) for the physical domain.
However, I'm unsure how to update the ghost cells between different boxes in this multi-box domain setup.
FillBoundary always fills ghost cells between boxes. The periodicity information is an optional argument. If present, periodic boundary conditions will be applied in addition to ghost cells between boxes.
In the "heat equation simple" example, I'm working with code that uses phi_old.FillBoundary(geom.periodicity()); to fill the periodic boundary conditions (BCs) for the physical domain. However, I'm unsure how to update the ghost cells between different boxes in this multi-box domain setup.