Multiple reference frames?
 

Hi I want to compute the axial fan model. Inlet velocity is 10m/s and axial fan is located in middle of duct. It is rotated by inlet flow. RPM is 1300 rpm (measured value) Boundary condition of outlet is pressure.

My model is 1/8 of real model. So it has cyclic boundary condition.

When I used implicit multiple reference frames, the result was not converged.

What is difference between Implicit multiple Reference frame and explicit multiple Reference frame?

What is need to use multiple reference frames?