The direction of eddies is as before influenced by the motion of the lid. With increased Rayleigh number, the downward shift of the core center is not that evident. This could be because the buoyancy forces in this case is more influenced by the temperature difference across the walls rather than by the gravitational force which is acting down. With increased Reynolds number, the tendency of shift of streamlines towards the walls is seen as before. The bottom of the cavity being heated more that the top is no more evident in this case.
Temperature variation is fairly uniform from the left wall to the right wall.
The buoyancy forces now are completely dominated by the temperature difference across the walls. The two eddies observed in the previous cases is completely taken over by a single primary eddy with the core closer to the hot wall. The direction of flow is clockwise. With increasing Rayleigh number by increasing the coefficient of thermal expansion by one order, not much of significant change is observed in the streamline pattern as seen in figure 12. When Reynolds number is increased by one order, there is a small shift in the core of the large eddy towards the cold wall.