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.

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maomao39	Reynolds number for case flow over airfoil Tweet 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.