It runs better with the attached. I reduce the size of the inlet and outlet so they only cover the relevant areas (there could be a conflict with the stl wall since the mesh is so coarse). I also changed the fluid and solids normalization. There is also room for improvement in the mesh. I haven’t tried to change it since I am not sure if you can afford a finer mesh.
Disengager 1.mfx (24.8 KB)