Hi everyone, I'm doing an analysis with Comsol on an Impeller. Shortly, it is a roller (cylinder) that applied a pressure on a blade (shape of an helix with variable pitch; I have the equation of the bade) at a specific radius to deform it. I've done my assembly in Catia (impeller and roller) and imported it to Comsol. I think all my equations are OK but I can't get any "answer" from Comsol. Here are my questions : Is it possible to simultae the movement (helix shape) of the roller on the blade. If yes, do I have to prescribe displacement to the subdomain or would it be better with only THE point that is following the helix shape path? Another problem I got (the reason why I can't get the problem solved) is Error 7097 : Parameter list must not be empty. Does anybody know what's this list? I tought I had filled every field that has to and defined all constants and variables. I'm using the Parametric Solver with theta as parameter. I've attached an image of the assembly for a better visualisation. Thanks!