Hi everyone,

I'm using COMSOL Multiphysics Magnetic field interface to modeling 3 phase power reactor. According to COMSOL Manual reference the best preconditioner for iterative solver in magnetic field is geometric multigrid (GMG) where in coarse solver configured with Auxiliary-Space Maxwell (AMS). Whereas, AMS is not support complex number and each phase has 120 degrees phase difference with each other (for ex. current in phase B= Irms*exp(j*2*pi/3)). Also, I have tried direct solver instead of AMS and solution not converged. Does any one know how to configure the GMG preconditioner or any solution for get true results?

Thanks

Best regards,

AhmadReza