NASA: thumbs down on VSAERO shape factor H

[aerohead]

If this link succeeds, it's an empirical evaluation by NASA, to validate the capability to predict the flow separation location on a body, based upon the Electronic Data System's VSAERO, mentioned by Goro Tamai, in his book, The Leading Edge.
The title of the thread foreshadows their results.
https://ntrs.nasa.gov/api/citations/...9890010727.pdf

[freebeard]

TLDR;

Figure 27 appears to imply an attached wake from an integrated half-body will lift itself clear of the larger surface due to it's internal dynamics. Correct?

[aerohead]

Originally Posted by freebeard

TLDR;

Figure 27 appears to imply an attached wake from an integrated half-body will lift itself clear of the larger surface due to it's internal dynamics. Correct?

Can you tell us where that comes from? I haven't a clue.

[freebeard]

It's the second figure on page 30 of the PDF you linked to.

[aerohead]

1) I cannot associate that structure with anything related to an automobile.
2) There is no streamlined half-body depicted anywhere.
3) Half-bodies aren't ever 'ON' surfaces.
4) In fluid mechanics, there's no such thing as 'internal dynamics.'
5) Half-bodies do not have wakes. They're 'streamlined', incapable of generating a wake. Just a bit of TBL sloughing off the trailing edges.

[kach22i]

The rotor hub has such a shallow slope or shape, yet so much turbulence.

Must be a tough environment with those large helicopter rotors swirling around.

Not the results I would have expected.

I guess this makes Frisbees and flying saucers candidates for the non-aerodynamic thread.