This video is taken from the FDE Learning Track on Ansys Innovation Courses.
The FDE solver region will define the geometry, mesh and boundary conditions.
There can only be one FDE solver region in a simulation project file.
You can add other solver region types, such as the EME solver or the variational FDTD
solver, but only one simulation region can be active at a time and it will be the one
used when you run the simulation.