Fig.4 represents the turbulent viscosity distribution
in the vertical plan for four configurations.The closer bump to the turbine intensifies the displacement
of the turbulent viscosity towards the tank solid walls.4, b and 4, c), the wake of the
turbulent viscosity grows at the upper part of the tank compared
to the other two configurations case 1 and case 4
(Fig. 4, a and 4, d). 4, d).