Quote:
Originally Posted by aerohead
1) on attached flow: page 114, ' The C-Pillar vortices are so strong that flow remains attached over almost all the sloping back, despite the large angle of inclination.'
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That's right: did you actually read what you wrote in the quote?
The flow remains attached...
Not that 'the flow only looks like it remains attached because of what the tufts show - but they're not right',
but the flow is attached.
So, let's go back to the Porsche - initially, the flow is largely attached, as indicated by the tufts. The placing of the spoiler reduces flow attachment ie increases separation. And the placing of the spoiler reduced lift. Therefore, lift was reduced by increasing separation. It seriously isn't hard!