Reply To: divergence troubleshooting

[Amrita Pati]

Hi Fakhriyya,

We typically say that a simulation is diverging when the energy inside the simulation keeps increasing exponentially. I wouldn't quite call this divergence. But ideally, the energy should gradually reduce through the simulation and reach a value of 1e-05, at which point the simulation would terminate, and you can extract your results. It is hard to predict where these oscillations are coming from. It could just be that you are simulating something at resonance, where it takes a long time for the energy to decay and at the same time, the metal Boundaries which are not as effective at absorbing the EM waves as PML, are contributing the overall energy of the simulation by reflecting some of the fields back. Could you provide a bit more information on what you are simulating? Maybe a screenshot of the geometry would also help.

Another thing you can do is, change back to PML and run the simulation with a Movie monitor. This would record the fields through out the simulation. If you play the movie monitor, you could most likely identify which region in the simulation is where the local growth in the field takes place.

Regards,
Amrita