Quote:
Originally Posted by skyking
On the Jaguar picture above, the center 6 tufts are not looking so great downstream of the shark fin radio antenna.
That area does not look attached to my eye. Either side of it, the two rows are looking good and I think greatly influenced by flow wrapping around from the sides. In the center, the window slope is determined not by aero but by styling. It is truly too steep to stay attached.
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The 'template' comparison suggests a compromised boundary layer, possible attached longitudinal vortices, and vortex-induced downwash, exactly like, but not as severe as the Porsche 911/ 912.
If so, the area over the rear roof would carry the low pressure of the separation line upstream, closer to the suction peak, at a lower static pressure, explaining all the observed phenomena.
Only a smoke flow survey would reveal the actual air flow. I remain steadfast in my rejection of tufts as accurate indicators of flow.