https://www.youtube.com/watch?v=HXxkNF2L__8

Today, we look into how undertrays, splitters and diffusers work, starting off with a simple explanation, before moving into some case studies and a discussion of underbody sealing and canards. Sorry for the epic video length, there was a lot of material, to help you out a table of contents is below:

-Why ground effect works 0:56
-Undertrays on F1 cars 4:12
-How the diffuser works 5:37
-What front splitters do 8:58
-Case studies of real world parts 10:48
-Sealing the underfloor with vortices 15:29
-Canards and the floor 18:27

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