Quote:
Originally Posted by Cd
How does downwash appear different from the surrounding tufts ?
Do tufts in a downwash remain steady, or do they flutter in any way different from areas of the car that are not in downwash ?
What clues are there that certain tufts are in downwash ?
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There is only attached or separated flow. The behaviour of the tufts makes differentiating them easy.
It doesn't matter what causes the attachment - Coanda Effect, downwash, what you had for lunch.
This is how confusion spreads here! In this case, a differentiation that no-one else makes.
Edit: Just to make this crystal clear.
1. Aerohead made up a new definition of attached and separated flows, where attached flows aren't
really attached if the flow attachment is caused by downwash. This definition is in no aero textbook or tech paper, and is not supported by any aerodynamicist I've ever been in contact with. (I assume that Aerohead did this so that he could justify the template ie the fact that there is clearly attached flow on some cars that, according to his template, couldn't have been.)
2. Then someone (sorry, Cd) uncritically picks up this baloney and then tries to extend it to tuft patterns.
3. A whole new series of misunderstandings potentially developed, all based on stuff Aerohead has just literally made up!