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Keep throwing the caution flags, but throw them at the right thing.
An Indian grad student's paper showing empirical verification of theoretical modeling only proves that CFD makes testable predictions with a degree of accuracy. This isn't a VG paper, they just use them as a matter of convenience, as their properties are well known. Standard academic procedure.
The Mitsubishi paper is interesting, as it's clearly aimed at performance improvements. Those familiar with car aerodynamics (or at least with Hucho) know this test is rigged. The Lancer rear window is too steep to maintain attached flow past the roof. 14 degrees is the transition, IIRC. Mitsu's doing good engineering here.
VG's work wonders in certain applications, as on airplane wings. Not so much elsewhere; throw the flag at the offender, not the tool.
Frank
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