[KVRC ~ish] CCE LMP01

[machin]

Probably a good way.. I presume that makes it a lot quicker?

[RicME85]

Can get a figure in 5 mins. Obviously isn't accurate but can get an idea as the numbers are definitely different for each airfoil and AoA

[RicME85]

Current rear wing profile:


Variante style front wing airfoil:


That close enough downforce level?

[machin]

Not bad! So is the Variante style front wing the 3 (or is it 4?) element one? And do you have it positioned the same height above the ground as the other wing (just checking it isn't benefiting from ground effect...)?

[RicME85]

It's one of the airfoils taken from the whole car cross section Chris did in an early round.
I have scaled it to fit the rule box for the rear wing and place it so the trailing edge is on the very back edge of the rear wing reg box (trailing edge is on the line between the rear top corners of the RWEPs).
Both this and the airfoils I was using are placed in the same place for this test ie along that line

[machin]

Ok...So just checking I understand: the first result is the aero data for the current twin element wing(?)... And the second one is a single element wing based on one element from Variante's cross section?

[RicME85]

Yes with the Variante one with an AoA that produces a similar level of downforce to the original twin element.

[machin]

Cool, well you should be pretty safe to carry that Cd.A saving (0.06) directly over to your last full car model... So that should bring your total car down to a Cd.A of about 1.30... And an overall L:D of 3.85!

...are you planning to try a few more different element shapes?

[RicME85]

Yes definitely. I tried one but couldn't get the downforce from it.
Went looking for high efficiency wings but got caught in a world of profiles :S

[variante]

Could you show a cross section of the wing you're talking about? (possibly showing pressure distribution)

[RicME85]

Which one?

[variante]

The one inspired by my airfoils

[RicME85]

I can but it won't show a lot as I have only run the 'test' setting in OCCFD to get some vase figures whilst working out the AoA.
Now that I have got an idea I can use the usual OCCFD setting to get a proper set of figures.
Also have the issue of legality as I changed the AoA but not kept the airfoil within the cross section rule for the rear wing so need to work on that.

[RicME85]

Found something very interesting regarding OCCFD.
This is a set of figures obtained with the Stable AWS setting:


This is the same wing STL file but using just the Testing local setting:


Figures are all but identical, one setting took hours with a fine mesh, the other took less than 5 minutes with a coarser mesh.

[machin]

Maybe because it is a small object, with relatively simple geometry?