Reference value
 

Hello

I setup model :the flow around 15 cylinders (3d).

I' m new fluent user, can anyone tell me how to set value of Area, Length,, in box "Reference value" to calculate Cd coefficient for 1 and many cylinders.

I saw one document point that :Area =radius of cylinder * height of cylinder
and Length = diameter of cylinder. it is right?

thank you

The projected frontal area is most commonly used as the reference area and the diameter as the reference length

Hence I believe it is Area = diameter * height and length = diameter

The reference lengths are rather arbitrary, if you have data/results to compare against then you should choose your reference values to match the same ones.