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The dimple study has dubious application to real-world cars, I think. Their analysis only shows what we already know: where airflow is detaching from an object, adding a dimple (or a vortex generator) will delay flow separation by adding energy to the airflow. The problem here is, the authors did not investigate the effect of multiple dimples on the shape of an actual car, just one dimple on a small part of a very simple body.
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