[KVRC] Khamsin Virtual Racecar Challenge 2016

[AratzH]

Thank you soo much!

It sometimes happens the same to me (I have the suspect that is related to the internet connection or firewall).

Yes, the first time I was able to run it I got 5 or 6 windows firewall messages during the process, but I thought saying yes would fix it for the next test. Anyway I might try to run it with the firewall off, It actually runs reasonably fast (1.5h in the light mode, 4,5 on normal).

Can't wait to see the final results!

[etsmc]

for those that are interested I have tried to put together a bit of a blog of the results and development for my car.
it can be found at http://www.mercurymotorsport.wordpress.com
I am going to try and keep it up to date mainly so I can remember what changes I have made to the car, but also so people can see and make comment/suggestions if they wish.

[graham.reeds]

Some of your underside shots makes it look like your car is asymmetric from below.

[machin]

for those that are interested I have tried to put together a bit of a blog of the results and development for my car.
it can be found at http://www.mercurymotorsport.wordpress.com

Cool, I hope you sort out your cooling issues as I think it is great to see someone trying a front heat exchanger arrangement.

[AratzH]

Looking into my old KVRC stuff I found an excel for COP calculation. Maybe it works for this year too:

https://drive.google.com/open?id=0B0CP8 ... EFpNndDbkk


Regards,

[CAEdevice]

Thanks I will try it later.

[RicME85]

Yeah it does.
That's the old way of working things out from back before OCCFD when we used Khamsin. Just have to dig out the figures from the forces file.

[cdsavage]

Sorry about the delay for round 1, there have been some big challenges with some of the simulations. Here are some provisional results with some teams missing:

Code: Select all

                            Type   Cd.A    Cl.A     CoP    Power    Time
                   Variante   F    1.70    7.91    1.668   100%    371.78
                 JJR racing   F    1.52    7.67    1.689   100%    372.66
                  CAEdevice   F    1.74    8.07    1.728   100%    373.01
                         TF   F    1.27    6.70    1.557   100%    377.05
                  HP-Racing   F    1.45    6.42    1.692   100%    378.52
           RicME Motorsport   I    1.26    4.37    1.688   100%    387.50
Competition Car Engineering   I    1.08    4.35    1.793   100%    388.33
                   Kineuton   F    1.34    6.42    1.020   100%    389.34
       Machin's Shiny Melon   I    1.06    4.00    1.855   100%    390.73

[RicME85]

Round 1 goes to me
Very close despite different approaches to the allowed areas of the car. Im going to have to put some work in to make sure I keep the advantage over Machin
Interesting to see MSM has 100% power running the 'restrictors' that Machin had on his car in the pre-season race as looking back at the results he only had 85% power. I assume they were enlarged slightly to block the flow between the wheel fairing and the sidepod to force the air to choose the sidepod intake?
Quite a gap between KVRC1 and KVRC2 this race, wonder if we can whittle that down over the season or if the big guns will out develop us seeing as we have a smaller area to work with.

[CAEdevice]

Thank you Chris. What happened to Mantium? He said he had cooling issues but he is not present at all.

Congratulations to Variante, JJR and TF: impressive how the laptime is similar in such a long circuit as Nurburgring and with different design shapes. I am happy for my 3rd place (if confirmed), but the distance from Variante and JJR is so small that I can't stop thinking about a way too improve (but I don't have any idea since the car has been already optimized).

Congratulations to RicME too for his victory in the intro class.

[machin]

Round 1 goes to me

Yes, well done; I was too conservative with the front end, as I wanted to make sure I had 100% power... I obviously went over the top as I ended up with loads of pressure...

When you look at CAEDevices car I don't think there is anything stopping an introductory class car using a similar front end... Although I would be a little concerned the cooling might not work... The Main class can simply enlarge the inlets to solve a cooling deficit, whereas we must be a little more cunning with the front end air flow (that is not a complaint; it is the same for all Intro class competitors, so is fair for everyone).

Presumably all the cars which showed a cooling problem are being re-run, which is why everyone in the provisional results has 100% power...

[Alonso Fan]

Oh no, bad news for me then I thought I'd have good cooling with those massive inlets

[CAEdevice]

When you look at CAEDevices car I don't think there is anything stopping an introductory class car using a similar front end... Although I would be a little concerned the cooling might not work... The Main class can simply enlarge the inlets to solve a cooling deficit

I generally agree, but in my case I would prefer to reduce the inlets area: 50000mm2 per inlet is much more that enough even for a pressure differential that is higher than 2017 requirements.

[cdsavage]

Presumably all the cars which showed a cooling problem are being re-run, which is why everyone in the provisional results has 100% power...

There have been a couple of independent problems, but one is that some entries have been showing small regions of extreme high or low pressure around the inlets or outlets - I think this happened occasionally in 2015, but since we're now directly tying the inlet/outlet face pressure to the engine power, this has a much greater effect on the results. Julien has tried re-running some of these simulations with some different settings but we might not be able to get a realistic set of results, unless we ignore the inlets and outlet aspect completely (and assume 100% power), which would be a bit unfair for everyone else if that entry would have actually missed the pressure target.

[Alonso Fan]

Is the problem arising due to the geometry we submitted or is it a flaw in the cfd simulation?