Ioniq 6 cd of .21!

[freebeard]

They're got themselves a really photogenic wind tunnel.

[aerohead]

Yeah, she's a real sweetie!
Anechoic too!
Which could lead one to believe that the now-infamous 'separation trap' was as much to do with 'noise' as it was drag; since it's also something regulated by the EPA.

[aerohead]

For anyone interested in the parametrics, blueprints are available.
https://www.the-blueprints.com/vecto...undai_ioniq_6/

[aerohead]

Al printed off a blueprint of the 6 for me, and I photo-enlarged it up to my contour scale and threw it on the light table.
* Without the upper and lower rear spoilers, the roofline is a very close match to Wolf Hucho's 1978, basic, 1/2-body roofline, on display in the Deutsches Museum in Munich. It goes as steep as 29-degrees slope, and produces Cd 0.15.
* If you create a vertical line, originating at the rear face of the 6's rear tires, and project it upwards, it will intersect the backlight where there's a probability for flow separation.
* The upper spoiler's tearing edge lofts the separation point upwards, with a tangent angle relaxed to 15.5-degrees off horizontal. This re-accelerates the flow, mitigates the adverse pressure gradient, allows for re-attachment, and some pressure recovery before the flow reaches the wake. This tearing edge 'contour' is almost a dead match to Wolfgang Klemperer's 1922, basic, 1/2-body, tested at the Zeppelin Werke.
* From the Hyundai wind tunnel smoke-flow imaging, the lower spoiler is almost completely embedded within the turbulence behind the upper spoiler, catching only a little edge flow.
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If you're tracking parametrics, you'll notice that the Ioniq 6's aggregate dimensions are very similar to those of other cars of similar Cd.

[briantrice]

A reasonable 3D model is available at https://3dmodels.org/3d-models/hyundai-ioniq-6-2024/

[RBurke83]

What I really wish my I6 came with was an interior indicator for the front flaps. I think I know when they open and close but not 100%.

[aerohead]

Originally Posted by briantrice

A reasonable 3D model is available at https://3dmodels.org/3d-models/hyundai-ioniq-6-2024/

Not sure if the file is large enough for CFD. And I didn't recognize any software formats mentioned, which have been associated with CFD.
Router Remmerie, of AirShaper has posted that, a model, scanning, surface meshing, and CFD, is going to cost $4,000 ( US ) for a single 'solution.'
At $ 193.00 for the IONIQ's data cloud, I'm suspicious of its efficacy.
I'm meeting with one of the lab managers with the College of Engineering at the University of North Texas' Mechanical Engineering Department, and hope to have some actionable information about CFD to share soon.