Hello,
I'm currently using Comsol version 4.2a and I'm having difficulty solving a time dependent electric currents model with a variable current source. The current source is a 300 Hz Biphasic pulse which I define as an analytical function and implement using a floating potential. If the current is defined as 0 at time t=0 then the solution does not converge. However, if I begin with the pulse turned on the solution does converge and the results at each point in time are the same which they should not be. I'm assuming this has something to do with my time stepping or solver but I'm not sure. I am fairly new to this software so I could be making an obvious mistake that maybe one of you could help me with. I have attached the model below.
Thank you for your help, Brandon