https://www.youtube.com/watch?v=3DIJMLrGz8Q
How does a rear diffuser work on a car? What is the purpose of a diffuser? In this video I explain the science behind diffusers, and how they increase downforce of racing vehicles.
Want more detail? Check out this paper on ground effects:
http://eprints.soton.ac.uk/42969/1/Ge...