Stephan, great job on this paper, you have certainly put a lot of good energy and work into this.
I have a question for the folks in here who know better. Someone wrote that you need to scale the viscosity? If you're doing comparative analysis, meaning you are simply comparing how a shape does before and after a given change, why would that matter?
It isn't as if he's saying "This is how the big one performs."
He is saying, "I took a model vehicle, got a base line force reading, then changed this on the model vehicle, and got this reading." Now I understand there may be some variables that don't "Scale up" but for the most part, this seems to be a pretty fair, accurate and economical way to test things.
My only thought with his modifications are they are not as good on the small scale as they would be when carefully crafted on a real vehicle, (Nothing personal Stephan) but this would slant his results in the direction of being less beneficial, meaning real world applications would work better than indicated in his tests.
The reason I chime in, is I'm really considering building a small scale wind tunnel myself in my garage to test what I can do to a pick-up truck. My thought was, that as long as I have a base line before any modification test, and the modification is the only variable in the test, the results should be close to accurate, I'm testing the modification.....not the whole system. Aerohed has repeated numerous times that from 20MPH to 250MPH air acts pretty much the same. I think that as long as you are getting 25 mph wind speed or more, and not making changes to the air speed from test to test, how can these results be too far off?
I have been able to open everything you've posted Stephan, so I don't think the problem is on your end.