"the frontal area is calculated using projected areas with a minimum feature length of 0.001 m" Try reducing the min feature length, and see if the frontal area is changing significantly or not. If not, we are good.
"residuals are set to 1e-5 but not all of them reach"
In the external aero cases, the physics is inherently complex to get the continuity below a certain value. However, you must check the mass-imbalance. If it is of a very low order, as compared to inlet mass flux, we are good.
"enclosure of 3m in front of the car and 5 m behind the car "
Take a cut section and visualize the velocity contours. If the wake is not completely captured, and is intersecting with the outlet boundary, you may want to extend it further.
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