Faster-Is-Slower Effect and Falling-Down Model

[godisreal]

I have tried to use fds+evac to simulate the doorway scenario, and I did not observe the faster-is-slower effect either. However, when I enable the falling-down model in fds+evac, and it does show some interesting result. Maybe I should explore more along this direction. The falling-down model in fds+evac was initailly developed by a student in Timo's group, and it has been included in the offiscial version of fds since fds6 (Not in fds5). Any comments? @fij