3D turbulent Ahmed body flow

Erdem

hi everyone. my question is about Ahmed Body. have you ever used this 3D problem for your validation cases. my problem is the material properties of air. my drag coefficient is %30-40 higher than the experimental value. I used ro as 1.14075 kg/m3 (@ h=426m T=20Celcius). the height is the geographical altitude of the Gottingen city that the original experiment conducted. but there is no info about material properties. does anyone interested in this topic?