Palabos - no boundary conditions

Hello, everyone!
I’d like to know what boundary conditions are used when no boundary condition is set on a particular boundary and periodicity is not set.
For example, this is the case in examples/tutorial/permeability
where inlet/outlet are set and non-periodic geometry is used.
However, I see that some reasonable nonzero values for velocity and pressure are produced on the border of domain after convergene.
My assumption is that ‘do-nothing’ is used in context of LBM but I did not dig too much in code.

Hi oryabkov!
If no periodicity is set, afaik Palabos defaults to regular bounce-back for outer boundary cells.