I am trying to design a transformer in FEMM and I have this issue.
First of all, I simulated my transformer with 0Hz frequency and the Magnetic field is illustrated in the following figure
Then, I did the same simulation with 50 Hz frequency and the Magnetic field is illustrated in the following figure
If someone observes these two figures, it can be seen that they are pretty similar. However, we all know that the transformer operates under AC current/voltage, so someone could expect that the results of the simulation when f=0Hz to be very different than the results when f=50 Hz. I can not understand why the transformer at 0 Hz operates similarly with the transformer at 50 Hz.