Hello Yi, (edit - )nnI had a problem with converting the mesh to the right .msh file (not the fluent one). Now I understood how to do this using de polydata app. I used DesignModeler to drar tha assembly of the extruder and I did the meshing using mechanical. I tried to use it directly on polyflow and I got the results and so on. The only problem is that the screws are not moving in my results. Is this because I am not using polyfuse and than the superposition technique is not working?.Thank you so much for your attention,nLarissan