Magnetorheological Fluid flow simulation COMSOL

I am also doing a simulation with Magnetorheological fluid following Bingham Non-Newtonian model. Till now I have performed the simulation in a uniform magnetic field using Laminar Flow Module, but now I intend to perform the simulation in a space varying magnetic field which I have simulated using AC-DC module.
Could anyone please tell me a possible way of coupling the two solutions?
Thanking you in advance.

Dynamic Viscosity_eff=Yield Stress(Magnetic Field)+Viscosity_zerofield

Yield stress si a function of magnetic field in the fluid flow region.