Discussion Forum

Hello, (My problem .mph file is attached) I'm using AC/DC Module>Magnetic Fields, to simulate the problem, where I have metal sheet (e.g. aluminum) placed underneath a source of magnetic field (source=I'm generating magnetic field by puting Surface currents (using surface current boundary) on a cylinder, which as a results generates magnetic field pattern of my interest. This magnetic field is incident on the metal sheet). I want to see how the currents induced on the metal sheet are attenuated along the thickness of metal sheet in z-direction with respect to skin-depth phenomenon. So, I'm essentially trying to verify the good old relationship J=Js * exp(-d/skindepth), d=thickness (through the metal sheet in z-direction), J=current density (A/m) at a given d, Js=Surface current that I get on surface of the metal sheet. I've used distributed mesh on metal sheet domain and I want to mesh the remaining geometry (i.e. boundary box and cylinder source of Magentic field) as coarse mesh to reduce computation time. The trouble is I run into errors for mesh in the remaining geometry. Can some one plz look into my comsol file attached and advise what I'm doing wrong? Is my overall approach right for simulating this problem? Thanks