Hi Paul, The main problem is that the polarization variable in your model has some discontinuities and that is causing convergence difficulty if you just use: V(internal)<+polarization; If I added some slew rate limiting (either using transition or using slew): V(internal) <+ slew(polarization,2.0/1u); (note, I'm not convinced this is right - it still has some convergence challenges - I get some small timestep problems near a discontinuity near the beginning); you may need to do some numerical smoothing rather than just using the slew function. Also the slew rate I picked was rather plucked out of the air! Regards, Andrew.![]()
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