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"As an additional source of resistance, any chaotic, random turbulent air it's initially embedded within, may end up a little less energetic due to viscous shearing effects, however I don't know that they'd be significant enough to even measure."
In other words, are you saying that the air will have less velocity as it leaves the NACA duct and enters the wake due to viscous shearing ?
What is viscous shearing ? Is that what air smacking into a strong opposing force is ? ( In this case, that opposing force being the air spilling around the back of the car into the wake ? )
If there is a large amount of airflow at the back of a car moving in a certain direction ( the wake vortex ), and a small amount of air is added to it with the intention of 'pushing' it into a smaller wake, ( my NACA ducts ) wouldn't the large amount of air just overpower the incoming air and cause the two to merge ?
In other words, I think that may be what you mean ?
I'm beginning to think the NACA ducts I added may be useless.
But at least I like the look of them !
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