[KVRC] Khamsin Virtual Racecar Challenge 2016

Post here information about your own engineering projects, including but not limited to building your own car or designing a virtual car through CAD.
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machin
162
Joined: 25 Nov 2008, 14:45

Re: Khamsin Virtual Racecar Challenge 2016

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RicME85 wrote:
stekar wrote:politely any1 with KHAMSIN for google sketchup even if its trial version send me to "stekarcomputers@gmail.com" for their website Vhttp://www.hibouscientificsoftware.com.au/ seems not to be working.

thank you
That isn't used any more
Where should people go these days?
COMPETITION CAR ENGINEERING -Home of VIRTUAL STOPWATCH

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CAEdevice
49
Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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Is the template car for the introductory class already available?

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RicME85
52
Joined: 09 Feb 2012, 13:11
Location: Derby

Re: Khamsin Virtual Racecar Challenge 2016

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machin wrote:
RicME85 wrote:
stekar wrote:politely any1 with KHAMSIN for google sketchup even if its trial version send me to "stekarcomputers@gmail.com" for their website Vhttp://www.hibouscientificsoftware.com.au/ seems not to be working.

thank you
That isn't used any more
Where should people go these days?
The Khamsin plugin got replaced by OCCFD which is on the KVRC website.

The Khamsin plugin was a nightmare to set up and was limited to just Sketchup, OCCFD is fair easier as you don't need to set everything up other than naming individual STL files and selecting the option in the OCCFD right click menu. Works from the Windows OS context menu so can be used with any STL files.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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To not get bored waiting for the races and the rules, here's another short video (made ​​with Assetto Corsa) with a comparison between a group C car (Mazda 787B despite the livery, 1990-1991) and KVRC one (MP003D, 2015-2016). The track is Mugello.

Image

Video: https://dl.dropboxusercontent.com/u/522 ... 016_02.mp4


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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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RicME85 wrote:Its autonomous :o
Yes, the driver is present, but located in the wrong place (some work to do on the model, if I had used 3DS or Blender it would have been easier).

Anyway, the physics are accurate: it is impressive the difference between a KVRC car and a C group car.

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LVDH
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Joined: 31 Mar 2015, 14:23

Re: Khamsin Virtual Racecar Challenge 2016

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If you like I could send you a model of my car.
It was created in Blender.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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LVDH wrote:If you like I could send you a model of my car.
It was created in Blender.
At the moment I'm quite busy with this project (and I am dedicating a couple of hours during last night to the new KVRC car, just decide which class/option to choose) but itwould be interesting to have two KVRC car. Maybe in the next weeks. It would be important to have clean UV surfaces (to apply textures).

PS: Are you talking about Mantium racer 2015 or 2016? ;)

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LVDH
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Joined: 31 Mar 2015, 14:23

Re: Khamsin Virtual Racecar Challenge 2016

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I am talking about a model good enough for your simulation.
How much copy-and-paste are you aiming for for 2016?
You do not think the standard provided car will be good enough?

cdsavage
cdsavage
19
Joined: 25 Apr 2010, 13:28

Re: Khamsin Virtual Racecar Challenge 2016

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First version of the guide parts released for full participants and the introductory subclass, available on the KVRC site here: http://www.khamsinvirtualracecarchallen ... nge-2016-1

The introductory parts may need to be tweaked a bit, but the full guide files can probably be considered as final unless there's a consensus on something that should be changed.

A new revision of the rulebook will be released shortly. The only substantial change is the heat exchanger area (option 2) will be decreased to 230000mm^2.
SR71 wrote:Been lurking on this thread for a while now, did I miss the conversation about the side impact structure being fixed?
The side impact structure has been removed for 2016.
CAEdevice wrote:What about an option 3 compeltely free except a very mimimun heat exchanger surface, but with 2017 mimimum flow?
I think we should probably leave any further additions like this until next year, since the cooling system rules for 2016 are already a big change over 2015.
SR71 wrote:does this mean the offset templates are rough guides or does our bodywork also need to include the offset surfaces?

For instance, in this rough build pictured below, the pink surfaces are the offset guide, would something like this be allowed?

http://postimg.org/image/72r9qttg1/
The rule only applies to certain regions where some space needs to be left for realism, eg to provide a path for airflow from cooling intake to cooling exhaust, from engine intake to engine template, or from engine template to engine exhaust. The reason that they're only described as 'guides' is that there's no concrete requirement as to how much of the bodywork must lie outside the offset template, it's judged case-by-case.
SR71 wrote:2) the vol_bodywork template has no exterior wall, I defined this missing surface in the image below (red lines). Does this mean we can have bodywork past 1000mm of the centerline? For instance covering the rear wheels?

http://postimg.org/image/itov8jzs9/
I think there is a problem with the importer you are using. The new guide files include both STEP and STL, have a look at the STL version if the STEP version is causing you problems. Let me know if a different format would be easier for you.
variante wrote:I've just noticed that cooling inner extrusions cannot intersect suspensions templates (as last year). Why? It doesn't seem to me that the suspensions elements represent a significant blockage to the airflow.
Can we change this part?
Let me think about this one for a bit. For 'option 2' there's probably no issue with changing this. For 'option 1' however, I think there is the potential for a 'free' boost to cooling intake performance and (small) drag reduction by placing the intake ahead of the front suspension templates, since the internal flow is not simulated. The reason this is allowed with the cooling outlet is that the effect on drag is probably not as significant.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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LVDH wrote:I am talking about a model good enough for your simulation.
Yes, I was joking... the same for my car in AC: the diffuser is not the one I used in the last two races.
LVDH wrote:How much copy-and-paste are you aiming for for 2016?
You do not think the standard provided car will be good enough?
At the moment I have not decided yet. My car has been developed during winter, but I would have to modify the cooling surfaces/ducts. I'm waiting for OCCFD 1.2 (1.1 can't simulate option 2) and I am not sure that there is enough time (I will be quite busy at work in the period between the first and the second race). I'm also considering to prepare a virtual wind tunnel on my own with OpenFoam, but it would require some time to calibrate mesh and porous media to match the official results (that I don't know...).

The "simplified class" (lets call it KVRC2? It sounds better, like LMP2) with a good diffuser, taken from my 2015 car, and (it seems to me) smaller cooling volumes, can be competitive (actually it is a cdsavage design...). I am a bit worried about it, but I would need to download the cad data to be sure.

At the moment I only modeled option2 cooling ducts into my 2015 car... they look huge!

Edit: this message has been written nefore Chris (cdsavage) wrote the message above :)
Last edited by CAEdevice on 09 Feb 2016, 23:02, edited 1 time in total.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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Anyway: 2016 cars will look much more interesting and realistic

etsmc
etsmc
7
Joined: 04 Apr 2012, 13:20

Re: Khamsin Virtual Racecar Challenge 2016

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well there be a sketchup file supplied?? only reason i as is when importing in to sketchup some of the faces are missing and the suspension template looks alot more basic than last year. if this is how its meant to be then i will carry on.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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cdsavage wrote:First version of the guide parts released for full participants and the introductory subclass, available on the KVRC site here: http://www.khamsinvirtualracecarchallen ... nge-2016-1
I opened the CFD parts: it seems that there is a scaling issue with the supensions (the wheels are ok for both scale and location). Could you check it? I'm not sure if the problem is in the original file or in myu import process.

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RicME85
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Joined: 09 Feb 2012, 13:11
Location: Derby

Re: Khamsin Virtual Racecar Challenge 2016

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Further to what etsmc said, is this correct?
Image