Pressure

 

The Frisbee experiences pressure differences as it travels through the air.  This idea is pretty easy to grasp.  As the disc travels into the air flow, an area of high pressure builds up on the leading edge, where the two boundary layers separate. (3)

The trailing edge of the cavity also experiences an area of high pressure due to the boundary layer reattaching to the surface of the disc. 

   
This can better be seem in the lower graphics done by researchers at the University of Manchester.
     

 

 

 
The above picture shows the areas of high pressure at the leading edge of the surface (a), as well and the trailing edge of the cavity (b). (1)

 
 

Trailing Vortices

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