Video: what are Venturi tunnels in F1 and how do they work? (Venturi Effect Explained). What are Venturi tunnels in F1?.

Venturi tunnels on Formula 1 cars are sections carved into the floor of the car, creating a constricted area under the car through which air is accelerated. This accelerated air creates an area of low pressure, and this effectively creates a suction effect under the car, generating downforce. Here is a great explanation of this concept:

— see video above —