Hi, this is my first post. I'm new in using comsol multiphysics and I'm trying to model a spiral inductor which is placed in an another material (glass) which is over a substrate. The pads of the inductor are outside the material. What i'm trying to find out is, the temperature of the surface of the device given given a dc current of the inductor. i don't know which solver to use working with heat transfer by conduction and conductive media dc. I usually get a message of singular matrix. Thanks in advance!