Khamsin Virtual Racecar challenge 2013 (CFD model racing)

[RicME85]

12 in total again.
Its a number I am happy with, if we had extra races but as there are 41 teams registered and thus only 3 races due to the processing time that many cars would need 12 is real shame, especially after the discussion about this a few weeks back where astra and I said 12 teams with more races would of been better than lots of teams and a couple of races but others didnt think it was fair.

[etsmc]

Will you give over on the number of races.. just accept its not going to happen. its not that others didnt think it was fair it was down to time and not just processing time. You really need to listen like i said before. As for the people complaining about legalities get over it, its not reall. you got the time it would gave done with out the penalty if it would have been higher well you and the others know that.

12 in total again.
Its a number I am happy with, if we had extra races but as there are 41 teams registered and thus only 3 races due to the processing time that many cars would need 12 is real shame, especially after the discussion about this a few weeks back where astra and I said 12 teams with more races would of been better than lots of teams and a couple of races but others didnt think it was fair.

[astracrazy]

etsmc i can't help but feel your the one not listening.

its not that others didnt think it was fair it was down to time and not just processing time

if you read what was discussed it was down to processing times purely because of the amount of cars that had signed up. with less cars = more races

[RicME85]

wow,
did you even read the post I was replying to?

[machin]

So, what changes did people make to their car's for the KVRC Italian GP?

[stez90]

I changed illegal bits, added bargeboards and modified front wing.

[variante]

You know, machin, a good part of the result will be decided by your software, in this race more than in any other . Will it reward cars with very low drag, or cars with good L/D balance? Who knows...
This isn't clear even in real life: Red Bull showed that is possible to win with a draggy car carrying a lot of DF. However it doesn't always work that way...

As for me, i used a rear wing that looks good for Spa rather than Monza. I experimented a lot (since i've got pretty much no chance to win the champ after the penalty): added cascades and strakes on FW toghther with a new nose for balance, smaller bargeboards with less AoA, no turning vanes, new diffuser. No gurantees they will work since i haven't used CFD yet (i'm like: day 47, still without CFD...)

[machin]

Will it reward cars with very low drag, or cars with good L/D balance? Who knows...
This isn't clear even in real life: Red Bull showed that is possible to win with a draggy car carrying a lot of DF. However it doesn't always work that way...

That's a good question.... and something I've been wondering about as a way of helping you guys design your cars (which actually was the reason for writing my software in the first place, albeit for real cars!)

How about this for an idea; after the Monza GP, I will run a "test" session with three aero configurations, representing low medium and high downforce configurations over the Silverstone lap and declare the coefficients used and the lap times. You guys can then see the results, see what's fastest, and compare the aero coefficients of the fastest configuration to your own car. You can then make adjustments to your car based on the test results...

Essentially it'd be like a practice session with everyone getting access to the same results....

????

[RicME85]

definitely as with the way things are currently we are just hoping we have chosen the right setup, at least with your proposal we would have more of an idea on how to set the wings.

for the monza race I have a heavily updated car as can be seen in my team thread along with a lower profile rear wing.

[andylaurence]

That's a good question.... and something I've been wondering about as a way of helping you guys design your cars (which actually was the reason for writing my software in the first place, albeit for real cars!)

How about this for an idea; after the Monza GP, I will run a "test" session with three aero configurations, representing low medium and high downforce configurations over the Silverstone lap and declare the coefficients used and the lap times. You guys can then see the results, see what's fastest, and compare the aero coefficients of the fastest configuration to your own car. You can then make adjustments to your car based on the test results...

Essentially it'd be like a practice session with everyone getting access to the same results....

????

Perhaps you could do something like this graph, showing lap time as a function of downforce/drag?

[astracrazy]

I made changes to my sidepods, floor changes and obviously wings for monza. See my thread for pics.

Your idea is good at the moment wing angles are a big guess

[etsmc]

only changes to my car was rear wing and added a feature that i thought might help with the drag caused by the rear wheels but will see how it goes. also changed the turning vanes and removed the flow conditioner over the sidepod [-o<

[julien.decharentenay]

Hi, just letting you know that we have 13 designs for Monza. I think that machin's suggestion is great. We could complement it by sending out the lap time for the Silverstone results for the design submitted for Monza.

For information, I twikked a bit the simulation side [added a mesh cleaning step to improve simulation robustness] - so the same design may have slightly different performance. I am currently working through the designs. No results yet.

[astracrazy]

cheers julien for the update

is it worth running that silverstone test with the monza cars though? with that monza spec wings im not sure it will give much relevance

[stez90]

with that monza spec wings im not sure it will give much relevance

You can compare how much the lower downforce and different L/D will alter your laptime. Since there were cars with very different DF & drag levels, with all the resulting combinations you will have a good idea of which is the best level of DF and lift-to-drag for optimal performance.

Take for example my car (STZ) and CSR from Magny Cours. Very different levels of DF, drag and L/D resulting in very similar lap times (1:17.96 vs 1:18.0 without penalty). Only 4 cents of second with more than 1,5X downforce advantage for CSR.