Skin-friction drag is a type of drag force that arises due to the viscous interactions between a fluid and a solid surface. In the context of incompressible turbulent flow over a flat plate, skin-friction drag refers to the force exerted by the fluid on the flat plate’s surface as a result of the shearing action of the fluid’s layers moving at different velocities.Â
- Cf: Skin-friction drag coefficient (dimensionless)
- Rec: Reynolds number based on the length of the flat plate (dimensionless)