Before revision: Section 11.17 Definition Table of drag coefficients in increasing order, of 2D shapes between walls (right column) and 3D shapes (left column) at Reynolds numbers between 104 and 106 with flow from the left The drag coefficient is defined as where: is the drag force, which is by definition the force component in the direction of the flow velocity;See lift force and vortex induced vibration for a possible force components transverse to the flow direction is the mass density of the fluid;Note that for the Earth's atmosphere, the air density can be found using the barometric formula.
After revision: , depicted with the same projected frontal area,Section 11.17 Definition Table of drag coefficients in increasing order, of 2D shapes between walls (right column) and 3D shapes (left column) at Reynolds numbers between 104 and 106 with flow from the left The drag coefficient is defined as where: is the drag force, which is by definition the force component in the direction of the flow velocity;See lift force and vortex induced vibration for a possible force components transverse to the flow direction is the mass density of the fluid;Note that for the Earth's atmosphere, the air density can be found using the barometric formula.