[Asiap]

Hi,

I am simulating air flow past cylinder and I wanted to calculate analytically the boundary layer thickness, just to compare it with what I got from Fluent. So I found this formula: δ ≈ 4,91√(νx/u) but I read it is applicable for flat plates. So my question is: can I apply this formula to a cylinder? And if yes, then my second question is: does x in the formula refer to the distance along the surface of the cylinder ex. half the circumference or rather the distance "across" the cylinder (I mean straight in the direction of the flow) ex. diameter?

I would be very grateful for any reply!
Regards,
Asia