The calculations assume that the viscosity of the Newtonian fluid is equal to the zero-shear viscosity of the Bingham fluid.

You can set the values of the zero-shear viscosity, , and the yield stress, . It can be seen in the snapshots that both profiles are identical when the yield stress is equal to zero.

For increasing values of the yield stress, one gets a larger region where the velocity profile is flat (i.e. velocity gradient is zero) corresponding to , where is the shear stress.