[MarcelloAsciolla]

I have a quick question, maybe very stupid, but I have to know the answer.
I know that frozen rotor and stage mixing plane interfaces are approximations, very useful for a steady solution, but what about the transient rotor stator interface? Is it an approximation too?
Is this is true, is it possible the use of "none" for an interface between a rotating domain and a steady one, maybe for a more precise solution?
I want to know if this option could be used for this case, what does "none" mean exactly for the solver and what could be the difference between this kind of interface and transient rotor stator one.