I just found this image.
March 2017
An Introduction to Automobile Aerodynamics
More than Meets the Eye
By Joseph Katz, PhD
https://mechanixillustrated.technica...-aerodynamics/
Quote:
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A closer look at the flow near a road car may reveal more areas with vortex flow, and as an example, the A pillar area is shown in Fig. 7e. The main A pillar vortex is responsible for water deposition while driving in the rain, and in addition, the rear view mirror creates an oscillating wake. This vortex flow near the rear view mirror is also responsible for vortex noise during high speed driving.
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Looks like a good article.