Khamsin Virtual Racecar challenge 2013 (CFD model racing)

[RicME85]

Wow, F:26.4 - R:73.6 downforce, would of thought my front end would have produced more than that.
Just reinstalling software as have a fresh Win7 install and will begin laying the foundations for the 2013 car.

What are the official regs regarding the nose and the vanity cover?

I cant wait for 2014, I really want to go for a late 80's/early90's look.

[astracrazy]

you can use the cover nick said mate

[RicME85]

Yeah I know, but I havent seen any diagrams of said cover

[N12ck]

Yeah I know, but I havent seen any diagrams of said cover

structural region must be below 550mm, but a non structural panel can go over this to cover the step,

in other words, 625mm is max height with the tip ending at 550mm maximum height

[Monster_Energy_F1]

Hey Nick,

I dunno if you've seen my updates on my thread, but is my nose legal? It's at 550?

[N12ck]

Hey Nick,

I dunno if you've seen my updates on my thread, but is my nose legal? It's at 550?

nose is legal, tub isnt

[Monster_Energy_F1]

Why not the tub?

[CottrellGP]

Why not the tub?

Maybe because its full of holes?

[Monster_Energy_F1]

There's one duct genius. Is that why it's illegal?

[N12ck]

There's one duct genius. Is that why it's illegal?

you have a huge dip in it, and that dip isnt legal as you dont have the correct radii,

[wigglez28]

Hi nick, did you use my original v2 car or the improved v2 car, new sidepods etc?

[flynfrog]

I thought it would be interesting to work out the % of downforce front and rear, and the Cl.A values split into front and rear as well (its all derived from the same data, just presented slightly differently):-

is there a standard Cg, Some of these cars are probably aero unstable. How are the lap times calculated? Do they take into account the unbalance front and rear and its effect on handling? Or are you simply putting in a Raw Cl and Cd number into a simple sim?

[N12ck]

I thought it would be interesting to work out the % of downforce front and rear, and the Cl.A values split into front and rear as well (its all derived from the same data, just presented slightly differently):-

is there a standard Cg, Some of these cars are probably aero unstable. How are the lap times calculated? Do they take into account the unbalance front and rear and its effect on handling? Or are you simply putting in a Raw Cl and Cd number into a simple sim?

standard C of G, but the C of P is calculated in CFD,

how laptimes are generated: http://www.competition-car-engineering.com/Intro.htm however, we input our own aerodynamic data rather than the stock aerodynamic data in the original application,

Aerodynamic data input:
180mph Cd, Cl
100mph Cd, Cl
100mph 3 degrees yaw, Cd, Cl

and Cof P

[Monster_Energy_F1]

There's one duct genius. Is that why it's illegal?

you have a huge dip in it, and that dip isnt legal as you dont have the correct radii,

Okay now I understand And I didn't mean to be rude sorry

[machin]

How are the lap times calculated? Do they take into account the unbalance front and rear and its effect on handling? Or are you simply putting in a Raw Cl and Cd number into a simple sim?

Nick's link to my website explains it in a more detail, but essentially the program uses the COP to determine front and rear downforce split, the program then calculates vertical loads on the tyres and from there the cornering forces at each end of the car. You can see this in the results; Marelli had the second highest Cl.A but because most of it was generated at the front his lap times were well off the fastest car.

The car's mass distribution is fixed as per the real 2012 F1 rules and runs at minimum weight plus 10kg of fuel.

Again, as Nick says; the Khamsin guys test the cars at two speeds straight ahead and one speed at 3 degrees yaw. the program then iterates for other speeds and yaw angles; in effect we have a simple aero map for each car.

I'm happy to answer any further questions....?