or demo4, mono=1
solves for the flow past a 2D airfoil using Kutta-Jakowski theory.
The colors represent static pressure (darker is lower pressure),
red lines are streamlines.
Solutions for various angles of attack are shown by animation.
With the mono=1 keyword, only the streamlines are shown. (On a
monochrome terminal, the pressure makes the streamlines invisible.)
interpreted function, defined at i/demo4.i line 10