Khamsin Virtual Racecar challenge 2013 (CFD model racing)

[cdsavage]

I've written up some draft regulations: http://www.2shared.com/document/GLphMT9 ... avage.html

I've basically picked most of the important rules from the 2014 F1 regs and left them as-is other than some re-wording here and there, then added some KVRC-specific rules. I have omitted any rules that only defined volumes where bodywork is allowed/disallowed, since that can be checked using the regulation boxes instead.

I have added a few rules governing the area around the cockpit since this area was unregulated last year. The cockpit template is one of the mandatory parts that must be enclosed within bodywork, and there is a minimum area for the headrest.

The only thing missing that I can think of is a rule on sidepod shape/volume (as opposed to just inlet area) - I'm not sure how we will do that yet.

I can share the files referenced in the images, unfortunately not in native sketchup format though.

[astracrazy]

any chance of e-mailing it to me? i cant download it for some reason. PM'd you my e-mail

[cdsavage]

Try this instead: http://www.mediafire.com/?d37us8k0qzd67xd

[astracrazy]

cheers

edit:
just had a read through and thought i should share my thoughts. Good one though mate

K5 - this should be between 750 and 1200 i think? the f1 rules allow the nose to be that far back (or forward from the FWC line)

also, will your files still work in sketchup? and is everyone happy for me to put forward an engine/gearbox?

[machin]

Very good. =D>

[astracrazy]

so i went ahead and made an engine anyway, roughly based on the renault as that has the best pictures. see what you think, i kept the exhausts wide as i guessed it may help with the sidepod issue

First image is of just the engine


inside this(last) years car compared with old engine as well (the engine is placed in the same location)


above


Will make suggested changes and do gearbox after. Perhaps the engine itself needs to be lengthened and exhausts not as wide

dimensions:
total unit height: 590 mm (bottom of engine to airbox top)
total unit width: 1150 mm (exhaust edge to exhaust edge)
total unit length: 600 mm (engine edge to turbo edge)

[etsmc]

like astracrazy i have started on my 2014 car and built the engine first also off the renault design
Will be more than happy to share it as it also includes a intercooler and radiator stacked together.

[astracrazy]

well yours is 10x's better than mine, so why don't you supply your unit for the competition (i think its only fair everyone uses the same)

On another note

is nick in for 2014? Because it seems everything is falling together without him (rules, engine/gearbox etc). We need the suspension adjusted for the chassis height change and the package created (including the rule box, rule book, engine/gearbox/suspension in the fixed place)

and on another note, on a research basis

is it possible machin can run a test on a track and car used last year using just the 100mph 0deg cd and cl for all variables to see the difference in lap time? just on a research basis to see the difference

[machin]

is it possible machin can run a test on a track and car used last year using just the 100mph 0deg cd and cl for all variables to see the difference in lap time? just on a research basis to see the difference

Using all three sets of of CSR's results from the Silverstone round, his lap would be 1:32:07
If we only use the 100mph 0 degrees results the lap time would've been: 1:32:05 (-0.02 seconds!!!)

If we use all three sets of JJR's results from Silverstone, his lap time would be 1:33.17
If we only use the 100mph 0 degrees results the lap time would've been: 1:32.48 (-0.69 seconds)

So whilst CSR's car was hardly affected by the yaw case, JJR's car was quite highly affected by it (in the yawed case his car made noticeably less downforce, and the balance was nearer the front)....

I guess as long as people know that we're only testing the straight-ahead case then they know what conditions to design for...???? It doesn't really take anything away from the challenge, although it does make it a little less realistic....

[julien.decharentenay]

Great work everyone. Thanks a lot for stepping in. I am unwell at the moment and not very responsive - I should be getting better by the end of the week. It is great to see people stepping in to design parts and rules - which I would not be able to do.

1- Website & data: I will set a new website shortly. Rather than trying to organise for shared data, I would rather allocate aspects of the challenge to people:

rules: cdsavage
rules compliance check: ???
parts (engine, gearbox, suspension): etsmc? astracrazy?
marketing: ???
Calendar: ???

2- CFD: Does anyone want to refine the modelling approach with me? Ideally with some way of correlating the results with a third party software. If someone is interested, we could do the refinement through the HPC experiment http://www.hpcexperiment.com/ program to get free access to computing resources?

Contributions will be listed on the website. Short bio would be ideal to complement the contribution listing.

Julien

[etsmc]

I have uploaded the Renault engine to my skydrive account and it can be access on the following link http://sdrv.ms/1cTqNY2
we could probably change it a bit so that we have the option of different radiator sizes maybe 3 in total and try and stick to a similar surface area
if anyone has pictures of other engine i may be able to do them also again i thin an option of 3 is probably the most you would want.
the engine i have done has the exhaust positioned in the regulated area for the same wheelbase that was used for the last challenge.
also from the intake entrance to the exhaust is hollow so would someone like to put this through kahsim and see if we leave the intakes open or blank them off we might be able to simulate some sort of airflow out the exhaust.

[astracrazy]

etmc - you may as well just block them off i don't think internal aero will work too well

rules: cdsavage

rules compliance check: cdsavage (he already has a 2014 rule box made up so im sure he can adapt it to fit additional rules his made) He could then get with etmc and place his unit inside the rule box for supply. Cd will just need to make sure its compatible with sketchup and everything is placed in the correct position. Julien can upload it to the website for everyone to download?

in terms of checking each car is legal throughout the competition, what are we going to do here to keep it fair? If one of us does it we will surely gain some sort of advantage by getting a proper look around others cars?

parts (engine, gearbox, suspension): etmc - engine/gearbox, i don't mind adjusting suspension if etmc doesn't want to do it? let me know

marketing: ???

Calendar: as in just come up with a calendar? We will need Machin to let us know what data he has got and then we can all vote?

[N12ck]

Hi all,
Thankyou for all stepping in I am sure this will be a success, I hope you all got my email,

however Julien, one thing I can do is help refine your CFD models, as this is just generic CFD comparisons.

Nick

[machin]

We will need Machin to let us know what data he has got and then we can all vote?

At the moment the program has the following tracks modelled in:-

Monza
Monaco
Silverstone
Magny Cours

I think these four are good because they test the extremes of an F1 car's performance...

I also have circuit data for a load of UK tracks that I could input, including Brands Hatch Grand Prix circuit.

I also recently did a few laps of the Norschliefe Nurburgring, so have track data for that place too!

If there is any track everyone particularly wants not listed above I can probably ask around my fellow racers and get sufficient data for a model.....

[KeithYoung]

If needed I can host files on my site's FTP. I know when people upload files to free sites generally you get a bunch of popups etc.

Let me know if you'd like me to host some CAD files, PDFs, Images, etc.