In the Name of God

Viscous Flow Aspects

Dealing with viscous flow assumptions, one may consider the following aspects influencing aerodynamic characteristics as well as other influencing factors:

Therefore, the viscous flow is characterized by the following aspects:

1- Viscous Stress: the velocity gradient + viscosity (indicated by Re number)

                          Furthermore, turbulence also affects both velocity gradient and viscosity

2- Pressure Loss: the pressure gradient + separation or bubbles