The following specific case of the GAMM workshop [2] is studied here:
total length of channel L=22.
length inflow section l=3.
total height H=1.
height inflow section h=0.5.
viscosity.
density.
maximum flow component of parabolic profile in inflow section Umax=1.
the flow volume is (2/3)hUmax=1/3.
Reynolds.
The result for the minimum x-velocity vx at distance x=0.8 behind the step is studied. This result checks the correct modeling of the recirculation zone after the step. At the distance x=0.8 we find the minimum velocity is vx = -0.041. This happens at y=0.1 above the lower edge. The results of the GAMM workshop were in between -0.066 and -0.018.