Viscos-Laminar model has been chosen all the time.Make sure the turbulence model is switched off. In the 'Viscous Model' tab, choose 'Laminar'.
Also note that the Darcy-Weisbach equation is valid for developed flow, so at the start of the bend you should have Poiseuille flow. You should have a sufficiently long piece of straight pipe before and after the bend in your simulation. Do you have this?
And I think it is long enough in start and end. L_e=0.06*Re*D=0.06*190*0.01905=0.218 m
My pipe geometry is exactly like this: 1 meter straight pipe, a 90 degree bend, 11 cm straight pipe, one more 90 degree bend, and 1 meter straight pipe again (almost U-shaped). So there's one meter in start which is 5 times greater than L_e and enough for being fully developed.