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Originally Posted by freebeard
Okay, but I wasn't thinking about a rough underbody. Assume the underbody is as rough as the pavement.
There will be a gradient away from the underbody and the road, with some amount of turbulent mixing at the center. IIRC test show an optimal ride height [for a given design]. Normally assumed to be exposure of the tire faces?
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Assume the boundary layer against the smooth car underside growing to, what, 30mm? I don't think that 'boundary layer' in this context makes sense
for the ground (because the ground boundary layer might be a few metres thick, and the ambient air is ostensibly still ie not moving like the air past the car). That would seem to me to give about 70mm (typical car with 100mm ground clearance) of 'free air'.
But you do make a very interesting point. I've not seen, that I can think of, the velocity gradient plotted under the car on a vertical axis. Does anyone know of such data?
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Ablative extensions to the pitot tube?
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