[s&m]

hi to everyone!
I've done many simulation using Channelfoam, and now i've have to learn how to use MRFSimpleFoam. I've seen the tutorial mixerVessel2D and i want to make a similar simulation.
I use PointWise for creating this simple mesh:



there are 3 Bc:
rotor -> internal surface - wall;
wall -> external surface - wall;
inletoutlet -> empty surface;

I export the mesh to Openfoam, but when i run the command cellSet, it creates an empty file..

FoamFile
{
version 2.0;
format ascii;
class cellSet;
location "constant/polyMesh/sets";
object rotor;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


0
(
)

why? i know i forgot something, but what?
please help me..

bye!