Reynolds number for case flow over airfoil

[maomao39]

In which range of Reynolds numeber is laminar flow for airfoil?
Is it Re < 5 x 10^5?
How about turbulence case?

 

[boneh3ad]

There is no general transition point Retnolds number. It depends on the shape of te airfoil and the surface roughness of the airfoil and the freestream flow quality and a host of other things besides Reynolds number. Typically though, even in a noisy wind tunnel the transition Retnolds number will be well into the millions. Still, that is very much an overgeneralization.

 

[maomao39]

The reynolds number for internal flow are much more easier.
My airfoil is NACA 0012 symmetrical airofoil.
Currently running on CFD simulation

 

[boneh3ad]

Yes but internal flow is fundamentally different. Even on a simple flat plate there is no way to determine the transition Reynolds number in general.