Wind and turbulence
Wind is not itself a force, but it can generate forces. Wind is the movement of air, and has an associated velocity at each point in space and time. It can be quite complicated, but fairly realistic effects can be achieved even with simple models of the wind. A constant wind blowing over a stationary object can be viewed in a similar way to an object moving through air, with the direction reversed. It generates drag and lift forces in a similar way.
Force due to the wind
As we saw at the beginning of the chapter, moving fluids have an associated dynamic pressure. Wind is nothing but moving air. When wind blows on an object or surface, it therefore exerts a force due to the dynamic pressure.
How do we calculate this force? ...