Non newtonian power law model in pipe annulus

Poly

Hello friends, I am using non newtonian power law model in pipe annulus for pressure drop calculations. I did creat geometry in Gambit using flunet5/6 solver.I could not get the different pressure drop for different power number "n". I am varying power law index"n" from 0.05-2 and eccentricity from 0.25, 0.5,0.75 & fully eccentric.Even for Concentric annulus pressure drop for different Power law index"n" is not varying ..its remain the almost same. I heard FIDAP solver is suitable for non newtonian power law model. But in boundar coinditions in FIDAP there is velocity inlet or inflow or inlet...there is just "outflow" and something else...please helpe me with this matter. Thank u much for ur time. Regards, Parag