[FLASH-USERS] questions about boundary conditions

[guido]

Hi Flash users,

I've been trying to find out how boundary cells properties are filled 
when periodic boundary conditions are used. Do you know if these cells' 
properties like

magnetic field, velocity, etc, are filled when periodic boundary 
conditions are used. Let's say our initial condition has uniform 
magnetic field or uniform density,

does boundary cells have the same value of these properties or these are 
set to zero or sth else ?

Could you please give me a hint of how to set static boundary conditions 
for a simulation, e.g. a constant magnetic field at the computational 
volume boundary edges.

Cheers,