[DGthe3]

Yes, I know that it is used but I don't believe that they can get as good of data as they can from a wind tunnel. They can get a rough idea and a good visualization. Wind tunnel testing is still used very extensively because it gives very accurate results. When I took fluid dynamics my prof told us that turbulent flow is fairly simple to analyze but amlost impossible to predict. A racecar will have fairly smooth (laminar) flow over most of the car. The calculations are much simplier but it still takes alot to calculate. A production car isn't as sleek, there are more things sticking out, and other things like that. That will cause more turbulent flow and therefore decrease the accuracy of the results. You will still get results but they may not be right.