As the secondary flow is drawn upward the air cools and its pressure falls, causing extremely heavy rainfall over several days.
12.
The momentum equations for the far field flow dictate that the thrust and torque will induce a secondary flow in the approaching wind.
13.
Tornadoes can be very destructive and the secondary flow can cause debris to be swept into a central location and carried to low altitudes.
14.
This secondary flow travels inward along the bottom bringing the leaves to the center, then up, out and down near the rim.
15.
The accumulation of dust then accompanies the secondary flow upward into the region of intense low pressure that exists outside the influence of the ground.
16.
The bed-load model accounts for the impacts of secondary flow ( bed shear stress direction ) and local bed slope ( gravity ).
17.
See Secondary flow # Circular flow in a bowl or cup . t ) " 05 : 44, 10 August 2010 ( UTC)
18.
This secondary flow effect dominates over that of irrotational flow : In real meandering rivers, we observe higher downstream fluid velocities at the outside bends.
19.
Hence, the secondary flow toward the center of a region of low pressure is also drawn upward by the significantly lower pressure at mid altitudes.
20.
Dust devils can be seen by the dust stirred up at ground level, swept up by the secondary flow and concentrated in a central location.
