Since all the data sits on the server, the geometry can be easily changed from week to week, or even day to day. One week, it might be a simulation of a rocket nozzle. The next week, it might be a wing in flight. From the student's point of view, it would just be a matter of typing in a URL and seeing what was up for that week. When I entered the Java Applet Contest, I came up with a few examples of problems which might be explored using the Virtual Wind Tunnel.
Rocket nozzles act very differently as the pressure ratio changes across the nozzle.
Sometimes shocks develop inside of them, sometimes they develop outside of them, sometimes they don't develop at all. The Virtual Wind Tunnel can be used to simulate nozzle flow, so students can see for themselves how changing the pressure ratio effects the efficiency of the nozzle. Simulating a wing allows students to see the rise and fall of pressure on the wing, and see just where lift really comes from. The Virtual Wind Tunnel lets students explore this question for themselves. Viscosity is necessary to produce lift, but Virtual Wind Tunnel solves equations which don't include viscous effects.