Evasion noted. I would be much more inclined to educate you if you did not misrepresent yourself. There is no shame in asking for help, or admitting one has not read everything. Remember this.
The paper you cited, by NOAA researcher Dr. Alan Huber -- who, incidentally, was one of many who researched aerial contaminant distribution in the World Trade Center aftermath -- is totally inapplicable to the WTC 7 case as you intended. There are several reasons for this:
- The WTC 7 fires were seen on all four faces, and strongly on three faces. That's emerging flame, not just smoke.
- The "leeward side" of a structure is the side opposite the freestream. There can only be one. The phenomenon discussed in this paper only concerns entrained smoke behind the bluff body, and cannot possibly affect the other two sides.
- Any structure in a freestream creates what is called a stagnation point, and the area of stagnation is greatest where the structure contacts the ground. Even the abstract alludes to this. This is because at the ground, there are no vortices coming over the top of the structure -- the flow close to the ground is purely two dimensional. There is no way for this effect to work at upper stories, such as 28-30, but there is a large volume of smoke seen there.
- There is no well-defined freestream at ground level in a city. Interference effects from other structures will create a very complicated buffeting flow, and this will break up the stagnant zone.
- The stagnant zone is also only temporary anyway. The freestream creates what is known as a von Karman Vortex Street, in honor of Theodore von Karman. The fluid oscillates back and forth. This is part of what makes flags wave and ripple in the wind, for instance. Anyway, this oscillation will periodically clear away the entrained smoke, as again, was noted even in the abstract.
- The other major flow contributor is convection. This was not modeled in Dr. Huber's paper. This convection, either from WTC 7 or from whatever the alleged source of smoke was, will disrupt the steady freestream as well.
This whole line of argument is analogous to, and equally stupid as, Jim Hoffman's claim that "heated air refraction" explains away the bowing seen in the perimeter columns of WTC 1 and WTC 2. Fluids just aren't that clean. You might be able to create something like this in a carefully controlled laminar situation, but we are at very high Reynolds numbers and turbulence will be everywhere.
That ought to do it. Thank you for your attention.