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skin friction drag
Skin friction drag is a component of parasitic drag that occurs differently depending on the type of flow over the lifting body (laminar or turbulent). Just like any other form of drag, the coefficient of skin friction drag is calculated with various equations and measurements depending on the flow and then added to coefficients of other forms of drag to calculate total drag.
==Flow and effect on skin friction drag==
Laminar flow is when layers of the fluid move smoothly past each other, and turbulent flow has a fluctuating and irregular nature. Different types of flow affect drag because as each type of flow occurs, it changes the nature of the boundary layer on the body. To understand exactly how skin friction is created, it is advised to do research on boundary layer. In short, turbulent flow creates a much larger boundary layer than laminar flow and therefore creates more skin friction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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