Geometry

Hello!!!!!!

I'm trying to do heat transfer + joule heating between two rectangles. But when I do the geometry I have two rectangles together (2 domains) 1 domain is the joule heating, and I have a problem here because I have automatically boundary conditions between the two domains as thermal isulation and electrical insulation, then the heat cannot flux to the other domain and I cannot remove this boundary. Could somebody help me?? how I have to draw the geometry or how can I manage the boundaries?

Thank you very much

Yolanda