calculate the reynolds (examination current)

[Sylnet]

How do I estimate a car's reynolds?

I designed and meshato the central section along the longitudinal direction of the car!
the car measures 4.5 meters in length and 1.5 meters in height... in the formula of re^ynolds:
re=(rho x u x l)/(viscosity) l is the length (cord)? Or do I take the height?

Thank you so much?

 

[Random86]

I would take the rope length, but I think the matter is a little subjective. as my teacher would say: "take whatever you want, as long as you know." so for me just specify the reference length well.

 

[sail]

Usually you take the length. you can find a confirmation in the work of ahmed, which produced a study in the wind tunnel on the effects of the vortices that are created on the back of a simplified model.

in some other paper is actually considered the height, but then it is usually specified.