The lid-driven cavity flow involves a fluid in a square box
driven by constant "blow" near the lid. Depending on the
physical conditions, a stable eddy can form within the box (as
shown by the streamlines). You may notice that when a stable
eddy occupies the entire box, its center is actually cooler than
the edge, indicating the faster heat transfer rate through
forced convection than through conduction. The lid-driven cavity
problem is one of the most important benchmarks for
computational fluid dynamics.  Grid Velocity vectors Isotherm
Heat flux Streamlines Choose a thermal conductivity (W/(m*°C)):
100 10 1 0.2 0.1 Choose a kinematic viscosity (m2/s): 0.00001
0.0001 0.001 0.01  Right-click to download this model  Developed
by Charles Xie. © 2010-2013 The Concord Consortium.