Hi, I am Pretty New to COMSOL & using it for my thesis work. I have started reading COMSOL multiphysics user's guide & able to draw geometry's. But i am unable to analyze a model like using Boundary setting etc.. I am very confused with the Options>sub domain/boundary expressions & physics>sub domain/boundary settings.. Can any tell me what these both mean & what is the best way to start learning comsol. Thanks & Regards Phanindra.