Thread: Discussion Boundary layer drag
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Old Apr 09, 2008, 10:42 PM
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rougher surfaces will cause the boundary layer to transition from laminar to turbulent quicker, thus increasing drag. You are probably thinking about golf balls and other items called "bluff bodies" that experience a drag reduction by adding roughness. roughness is added to trip the BL into being turbulent, where in the case of a golf ball it decreases drag by tripping to turbulent BL which stays attached longer, and in the case of a sailplane wing can eliminate laminar separation bubbles which are generally bad. So in the case of DLG wing laminarBL=good.
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