Here are animated GIFs for the “Flow separation and lift forces on houses” demonstration.
The first shows the case of the door being on the downwind side of the building, therefore, no internal pressurization (full video here).
The second shows the door on the upwind side of the house such that the building is pressurized (full video here).
Don’t forget to follow @nbkaye on twitter for updates to this blog. If you have a demonstration that you use in class that you would like to share on this blog please email me (firstname.lastname@example.org). I also welcome comments (through the comments section or via email) on improving the demonstrations.