Boundary Layer: A thin region adjacent to a surface where the effects of viscosity are significant, affecting the flow characteristics. Reynolds Number: A dimensionless quantity used to predict ...

Within the boundary layer, adjacent layers of fluid are in relative motion, and because all fluids have viscosity, there will be friction between the layers as they slide over each other. In other ...

Formally, both types of drag are due to viscosity (if the body was moving through an an ... The size of the wake decreases, indicating that the boundary layer separation on the cylinder or sphere ...