I need to develop a simple model in Comsol, but I have no experience with it. I need to see what the convective currents and velocity fields are at certain temperatures in a glass optical fiber. I have the information about the fiber and its dimensions. The fiber is going to be at around its glass transition state so it be like taffy. It's just cylindrical fiber surrounded by air. Can anyone send some pointers, or a pdf example that is similar, etc? Any help is appreciated.