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At what speed the air compressibility starts having effect on the car hydrodynamic performance ?

Question asked by Boyko Tchavdarov on Apr 17, 2014
Latest reply on Apr 25, 2014 by Jared Conway

Some new sports model cars (exclusing racing cars) can speed above 250 mph? - To improve the hydrodynamics we have to be aware at what speed (Raynolds number based on average/maximum hight of the car) the compresibility cannot be neglected for drag, lift- and down-force. Does anyone have experience in such tyupe of CFD analysis or knows the answer?