Wall distance equation can't converge when no wall BCs present (overset)

[ndevelder]

Hi All,

I've got a nalu-nalu exawind-driver overset case where the turbine is in the middle of the domain and all the background domain side BCs are symmetry. Nalu-wind fails and it appears to be related to the wall distance equation not converging? If I change one domain BC to a wall BC, everything seems ok.

This is a total edge case, but just documenting here for future. Maybe we need a new flag to be able to turn on/off treating symmetry BCs like walls for wall distance equation? Or the overset boundary needs to communicate it's own wall distance but that maybe gets slow with moving meshes and needing to re-solve.