The physical rationale is fundamentally flawed. It assumes that all wind that is "caught" will enter on the big opening and all of it will leave on the small op

The physical rationale is fundamentally flawed. It assumes that all wind that is "caught" will enter on the big opening and all of it will leave on the small opening. But that is wrong, the smaller of the narrow region the less wind enters the entire construction. The fundamental flaw of the rationale is that it confounds the concept of an engine to that of wind entering the tube. If you suck cold air into a compartment via a valve and provide heat inside it the air expands rapidly and must leave because it does not fit inside anymore. But note how we spend a lot of energy to expand the air and turn that internal energy into mechanical energy. There is absolutely no way that you could get air freely inside of a tube and have it "speed" up without actually pushing back on the air that is coming in. Imagine that you close the narrow part completely. What happens? Will the construction blow up, of course not? Will the the pressure inside rise to a high value? Of course not. It will simply fill up with air and will experience as much pressure as the wall of the building is subjected to. Can you make the closure experience more pressure than any other part of the building? No that is not how pressure works, it is uniform inside the building. Now imagine that you make a teeny tiny hole in the closed area. Will that lead to air leaking at insane speeds? No it will be barely noticeable, almost no air would be coming out. There is no reason whatsoever that the air would voluntarily go into a building than on it is own choose to leave on the tiny hole instead of leaving the same way where it got in (basically it is not getting in at all because the pressure inside is the same as outside) Does it work, of course to some extent, take the area of the building that catches wind, multiply it with the speed of the wind and density of the air and you get the the mass and volume of air that is moving. Air is actually pretty light, you would be surprised how big the area needs to be.