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the interface condition is needed for connecting different grid in a model : non matching interface, sliding mesh interface, and so on

the interior condition is usefull if you have surfaces in you model which are part of the fluid. If you don't use interior condition gambit can considerer them as wall.

the internal condition is quite the same as interior but it will be merge in the adjacent interiors in the final mesh if you use tgrid. I think that this condition is useless if you use gambit
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