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Old 10-06-2022, 12:30 PM   #11 (permalink)
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'data'

Quote:
Originally Posted by wouterremmerie View Post
Hi Aerohead,

no, we use a finite volume method:
this has been the default method for decades, although I do believe LBM could be (one of) the winning methods for the future.

Regarding drag values:
without discrediting the manufacurers, the claimed values are usually fairly optimistic (as they sometimes play with ride heights, rims, aircon settings, etc during testing).

We performed an independent validation on a Tesla Model Y together with one of our partners - our Cd value was less than 6% off compared to the measured value. And qualitative data (the flow structure behind the car) also showed good correlation:
airshaper.com/blog/tesla-model-y-aerodynamic-benchmarking

I would agree drag hasn't increased by 14%, so it's likely more a matter of comparing the right data here. Data coming from different sources and/or different measuring techniques (tunnel vs simulation) can blur the whole story.
Thanks!
My single brain cell activated, and it struck me that Ford Motor Company would be required to publish a 'crosswind-averaged' drag coefficient for EPA ( maybe ISO ) certification.
Some of the discrepancy between data may be wrapped up this manner in the 'way' they're required to report.
The qualitative 'trends' DO appear to be spot-on!
Thanks again!

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Old 10-07-2022, 04:24 AM   #12 (permalink)
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Quote:
Originally Posted by aerohead View Post
Thanks!
My single brain cell activated, and it struck me that Ford Motor Company would be required to publish a 'crosswind-averaged' drag coefficient for EPA ( maybe ISO ) certification.
Some of the discrepancy between data may be wrapped up this manner in the 'way' they're required to report.
The qualitative 'trends' DO appear to be spot-on!
Thanks again!
That makes sense on the EPA cross wind!
Also, we ran new sims on the Ford F150 Lightning, and drag has gone down by a lot (can't tell by how much, but maybe we'll launch a post soon if we get the approval).
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Old 10-21-2022, 06:41 PM   #13 (permalink)
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F-150 Lightning

Quote:
Originally Posted by wouterremmerie View Post
That makes sense on the EPA cross wind!
Also, we ran new sims on the Ford F150 Lightning, and drag has gone down by a lot (can't tell by how much, but maybe we'll launch a post soon if we get the approval).
Ford admitted that they were playing it safe on design, not wanting to put off ( scare off ) loyal customers by making the F-150 look like a 'science experiment'.
Since the thermal efficiency of the motor/inverter is around 95%, a reduced cooling system porosity would allow for ample cooling at less internal drag, and 'never show.'
Will be very interesting to see the new numbers when you get the green light.
PS
Member 'bondo' (Brett Herndon ) produced a wind tunnel-tested bedcover and tailgate boat-tail for the 2012 F-150. Together, they cut Cd 0.098 off the truck, achieving close to CYBERTRUCK's advertised Cd 0.30.

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