Hello! I am totally new to COMSOL so I am sorry if this is really silly. I have a basic geometry (created in Inventor) with a cylinder which has a bifurcation at a point and right before the bifurcation I have 2 parallel plates. I want to put a potential difference on the plates (+/- 2000V, for example) and 0 V for the cylinder itself (i.e. make it ground). I shoot particles (protons for example) from one end of the tube and I adjust the potential such that after passing through the electric field created, the protons don't go straight, but they go through the bifurcation. So i already have some issues. The geometry is succesfully imported, but when I select materials, even if it is set on "All domains", in the list below it apperas just 1 and 2 (even if there should be at least 3 elements), and I think they refer just to the2 electrods, not to the tube itself. Then, when I want to select the ground (i.e. for the tube itself), when I go to selection list some surfaces appear as "not applicable", and these surfaces are exactly the one corresponding to the cylinder. So basically I can't set the cylinder to 0 potential. I know this is probably very basic and stupid, but in all the videos I found online, after they import the geometry everything works smoothly, so I am not sure what I am missing. Any help is greatly appreciated (I attached the COMSOL file with the geometry imported). Thank you!
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