991.2 Intercooler Intake Design Observations
02-26-2018 | 12:04 AM
#16
Three Wheelin'
Joined: Feb 2016
Posts: 1,835
Likes: 610
This proves nothing, but I was trying to understand the airflow with spoiler up and down, so I did these flow visualizations. Just posting here because I thought they were interesting... maybe a little bit more work on the source image and Reynold's number modification would be useful.
Don't know if this is real wind tunnel, or just generated graphics, but all of the CFD and 'wind tunnel' flow visualizations I've seen of the 911 show better attachment.
02-26-2018 | 12:12 AM
#17
Rennlist Member
Joined: Dec 2009
Posts: 179
Likes: 30
From: North Carolina
Those clips have Re=2,000,000. At Re=1,000,000, the flow follows the car contours better, with fewer and less pronounced vortices. I didn’t know the appropriate length scale, so my Re could be way off.
then I used http://www.flowillustrator.com/
Last edited by jimjoe997; 02-26-2018 at 12:30 AM.
02-26-2018 | 01:06 AM
#18
Three Wheelin'
Joined: Feb 2016
Posts: 1,835
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http://galileo.phys.virginia.edu/cla...ds2/node4.html
02-26-2018 | 09:25 AM
#20
Banned
Joined: Jan 2018
Posts: 375
Likes: 1
err you do realise the the laminar to turbulent flow transition occurs at a Re of ~ 3000 
and that it may a larger impact on drag...
and yet most of the flow across a Porsche is laminar
and that it may a larger impact on drag...and yet most of the flow across a Porsche is laminar
Last edited by RRDnA; 02-26-2018 at 09:42 AM.