The skin friction drag coefficient, often denoted as Cf, is a dimensionless parameter used in aerodynamics to quantify the aerodynamic drag resulting from the frictional resistance between a fluid flow and the surface of an object. It provides insight into the level of frictional drag experienced by an object moving through a fluid medium.
- (Cf,1)laminar: Skin-friction drag coefficient under laminar flow conditions in region 1
- Rex1: Local Reynolds number for the specific region 1