In laminar boundary layer calculations, the wall shear stress parameter, v(x,0), is commonly used as the convergence criterion. This is probably because in boundary layer calculations, it is found that the greatest error usually appears in the wall shear stress parameter.

I wonder if we could use the same criterion for Unsteady Boundary Layer Flow of a Casson Fluid Due to an Impulsively Started Moving Flat Plate.

I am trying to solve it numerically using KBM in Matlab.

Thanks in advance for the answer.