Quote:
Originally Posted by Phase
...........road salt and red dirt is sticking to is due to low pressure or lift?
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I see what you are saying, it is interesting.
1. Salt spray goes everywhere, I would not make too much of it unless it's a striking visual.
2. Red dirt (
or "DURT" as a friend of mine puts on drawings) doesn't usually face the side of the car like that.
My guess is that so-called normal wheels suck in some air between the spoke openings to cool the brakes, and this results in higher wheel well pressures that exit out the sides between the wheel opening and outer tire surface thereby pushing airborne particles (dirt) away from the vehicle.
Exceptions on so-called normal cars would be when going though mud and it's no longer air pressure exiting but mud pressure, and that's going to leave a stain.
My conclusion: Airflow and PRESSURE on your car sides is so evenly distributed that anything in the air (disruption of dirt road surface) settles on it because it is NOT pushed away by other forces.
Question is; is that considered "low pressure", pressure that is lower than the surrounding undisturbed air? Which in turn would attract the airborne dirt.
Maybe what we see has something to do with a side Boundary Layer?
https://www.researchgate.net/figure/...fig6_343167605