The Reynolds number (Re) is a dimensionless quantity that represents the ratio of inertial forces to viscous forces in a fluid flow.
- Re is the Reynolds number,
- Ļā is the density of the freestream fluid,
- Vā is the velocity of the freestream fluid relative to the object (freestream velocity),
- c is a characteristic length of the object (e.g., chord length for an airfoil),
- Ī¼ā is the dynamic viscosity of the freestream fluid.