machin wrote: ↑
Wed Jan 10, 2018 9:03 am
The question from me is what fundamentally is different between Variante's car and Aratz's; they both have big front diffusers with the majority of the air coming off that going through the side-pod and Heat Exchanger area. Both cars have full-width sidepods, and yet Variante's car is pulling a lot more flow into the diffuser from the sides of the floor.... but nothing looks "wrong" with Aratz's diffuser from the images we have....
The magic of aerodynamics...
The images TF released are very small, but what I think is happening is that TF is using a too aggressive diffuser (great ramp angle, small transition radius). This solution may actually work, but it would need to be coupled with some big vortices helping the flow to stay attached to all the surfaces and goin through the imposed expansion.
On the contrary, TF's diffuser is receiving air from the front, with a wrong angle for the strakes, therefore those are not capable of generating the necessary vortices, thus no further air is sucked by the diffuser, which stalls immediately.
If he manages to start that chain reaction, he will gain a lot of downforce very quickly (and I'm pretty sure he managed to do that in the past, with great performances achieved).
The other details (radiused floor, optimized strakes,...) do help, but are secondary.
Ok, maybe it's high time to update my thread to give a full explanation about the functioning of that diffuser.
CAEdevice wrote: ↑
Wed Jan 10, 2018 10:05 am
BTW: Studing the CFD images, I realised that the diffuser that Variante designed for the last race is far better than any other one (except JJR's that I could not evaluate), it just would need some more air from the front wing to perfectly work. We are going to have much fun next year.
But it looks like yours is producing more downforce! Sure, the bigger and lower rear wing does help, but I think your diffuser is actually more optimized.
machin wrote: ↑
Wed Jan 10, 2018 4:30 pm
Variante has those unique "dive plane" additions...
Honestly those things are there only to quickly produce some more downforce at the front. They actually decrease the efficiency of the car by a good margin.