I'm not an expert, so forgive if I'm wrong, but low pressure over the top of the diffuser means lift and not downforce. The low pressure must be under the diffuser and the more the pressure over the diffuser is high, the more downforce you get.Just_a_fan wrote: ↑Mon Jun 28, 2021 11:22 pmYou'd still get some vortex shedding from the bluff rear end of the panel causing a von Karman vortex street, so there'd still be vorticity coming from the back of the opening. So the panel would need to streamlined but even then you'd still get alternating vortices being shed. And these would be long vortices across the width of the cooling outlet.Zynerji wrote: ↑Mon Jun 28, 2021 10:21 pmThis always makes me ask this question:gordonthegun wrote: ↑Sun Jun 27, 2021 10:17 amI'm always amazed at how big the cooling outlets need to be:
https://cdn-1.motorsport.com/images/mgl ... sf21-1.jpg
If the teams put a 150mm thick panel of 10mm Nomex honeycomb inside that outlet, would the relamination of the airstream be helpful to the rear wing? Would it cause much drag if the total frontal area of the leading edge of the panel was 30mm/Sq? That stuff is super thin and light. I'd love to see if it could clean up the wake of the car.
In reality, I doubt the flow coming from the outlets affects the rear wing that much anyway. That is being fed by freestream (nearly) air. The upwash from the wing affects the flow after it has left the cooling outlets and it will be mixed in with the flow coming from the diffuser.
I do wonder whether the flow of hot air from the cooling outlets actually helps the diffuser by effectively reducing the pressure difference above/below it. After all, the whole point of the coke bottle is to direct fast air over the top of the diffuser. Fast air being "low pressure" air. The hot air coming from the cooling outlets will be similarly "low pressure" being hot and moving too. (Using "low pressure" in the basic sense)