Hey everyone, I am currently attempting to determing the leakage flux (for all intents and purposes) from a solenoid (DC current) with various core shapes and sizes. I have tried doing this using Comsol and Feko, but so far have been unable to. Does anyone have any knowledge of either of these softwares, enough to give me a basic idea so I can start working? Further, say I have determined that I lose ~ 10% from the core. If I were to have a slight u bend shape, have the metal lying parallel to the solenoid and would to attempt to determine the force that the solenoid would impart on a piece of ferromagnetic material, is there a way to make a simple approximation without having to perform Amperes law outside the solenoid? Finally, if I am interested in finding the force on said material, where would I start? Can anyone give me somewhere to start? Thanks in advance for the help!