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Did you have a chance to look at the other "summary" paper I mentioned? Curious as to your thoughts on some of these ideas....
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You read Hucho twice, I downloaded that PDF twice.
It looks to me like they are using porosity at the front corners to internalize a turning vane.
I suspect the problems with their work that aerohead alludes to is that the correct Reynold number for the gross shape of the vehicle is different than the correct Reynold number for the fine details (at the same temperature and barometric pressure
). As skyking said.
I think you are right that a long box van will have sufficient length for the mayhem that happens at the front end to be ameliorated by reattachment and merging. The air is pressinginward along thr sidesand top
The Richard Wood infographic allows passive porosity into the club, but not base plates for that last 25%. It probably goes boattail—>box cavity—>base plate/porosity. In addition to adding 'Georgia Tech' to you search terms, try 'Richard Englar' he's the guy there. And 'Coventry University'. Here's a PowerPoint slide from them that addresses box cavities:
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I question those shallow cavities in the paper you cited. My own thought was to take a go-kart frame and a surfboard. Slice the surfboard in half raise the top half 2' and wrap a 2' strip of trampoline mesh around it. Raise the top half an extra inch to put the mesh in tension. It would stretch into a
hyperboloid. With black mesh it would be like a tinted window (or those pin-hole reading glasses), with rapid air changes inside, but no buffeting. I'm not sure how you would get in or out.
You can get free samples:
FREE Trampoline Fabric Sample Pack - SLO Sail and Canvas
The black mesh at the bottom looks to be some thing over 25% open. Much stouter than window screen.
With an August join date, you may not have seen this before. aerohead's inflatable boattail was 1:1. This is all I got before I decided (what was I thinking?) to sell my panel van.
It has a solid diverter, and where I thought to make it inflatable, now I lean toward bent fiberglass rods.