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Turbulent flow question

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Jay Kempf

Curmudgeon in Training (CIT)
Supporting Member
Joined
Apr 13, 2009
Messages
4,862
Location
Warren, VT USA
Does turbulent flow have to impinge on a surface to create an increase in parasitic drag or do vortexes in free streams also contribute? If that vortex was not associated with lift it is not part of the induced drag calculation. It would have to show up in an interference drag estimation I am guessing.
 
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