The boundary layer thickness on an airfoil
Hey guys,
I know that on a flat plate the boundary layer thickness is the thickness where streamwise velocity reaches 99% of the freestream speed. How does this work on an airfoil since the flow speeds up above the foil and slows down beneath it? Do we still use 99% of the free-stream as the thickness ? cheers, Nick R |
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No matter how much is your speed, whenever your speed in the perpendicular direction relative to the surface reaches 99% of the free stream,you can calculate BL thickness at that point. |
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thanks it makes sense
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good luck. |
A nagging thought on thickness notions
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IMO - Whichever notion you decide to go for, you need to define some sort of cut-off between your inner and outer flow, since even for the displacement and momentum thicknesses, you have to decide how much wall effects to incorporate... |
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