How to handle the errors in Comsol Multiphysics, in particular, Undefined variable. I'm modeling slip flow of gas in the vacuum chamber

Hi! Please, anyone, help me!!!! I'm totally new to Comsol, but my task is to model the flow of air in a chamber of the mass spectrometer connected to the second chamber through the small orifice....

14 July 2017 573 5 View