But the amount of turbulent flow that could potentially go under the floor of an F1 car or an LMP car is similar. The main disadvantage of an open wheeler is the turbulent flow that runs over the sidepods and goes to the rear.Vanja #66 wrote: ↑Fri Apr 27, 2018 5:23 pmvariante, I think floor sealing has more to do with keeping front tyre wake away from floor and diffuser, than with ground-effect sealing. Diffuser and ground effect floor don't work in the same way, so I never understood why teams seal them until I found out how important it is for them to keep turbulent, low-energy air away from the rear. As you car has completely closed wheels, there is no need for this - which is most likely why in WEC we don't have this floor sealing as well.
I suspect the actual difference is just about design philosophies and regulations constraints. It looks like F1 teams care more about floor leading edge downforce, rather than diffuser downforce. It would make sense especially considering how small an F1 diffuser is in comparison with an LMP diffuser.
Speaking of design philosophies and floor sealing: have a look at the 2017 LMP1 Porsche, and then to the 2018 Porsche LM tribute. The former has rounded edges to let airflow in and to exploit the diffuser imposed by the FIA. The latter has skirts to achieve the exact opposite, possibly because of a different diffuser design (different car philosophy for sure).
BTW I'm not saying that there is no floor sealing in F1. I don't know for sure yet. I'm saying they focus more on the floor leading edge area.
Yeah, as it's been said, their first effect is generating downforce just like a wing or a flap; the floor features either a lot of outwashing airflow with small pressure differential (so the cut acts like a wing) or a lot of pressure differential with some outwashing air (so the cut acts like a flap). At the end, there is no actual difference between the two, but you can see the different working principles: the former closer to the bargeboard and its outwash, the latter more rearwards, were the top of the floor is pressurized thanks to sidepod downwash.
As for its consequences on vortices, I'm not sure. I suspect that, if there are indeed sealing vortices along the edge of the floor, the cut we're talking about would increase its strenght and its downwashing effect.