[KVRC] Khamsin Virtual Racecar Challenge 2016

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machin
162
Joined: 25 Nov 2008, 14:45

Re: Khamsin Virtual Racecar Challenge 2016

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cdsavage wrote: Images for the round 1 entries have been posted here: http://www.khamsinvirtualracecarchallen ... -1/round-1
Ooo... I do like the look of the HP-Racing car... but they're all looking pretty nice!!!
COMPETITION CAR ENGINEERING -Home of VIRTUAL STOPWATCH

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variante
138
Joined: 09 Apr 2012, 11:36
Location: Monza

Re: Khamsin Virtual Racecar Challenge 2016

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Thank you, Chris, for the images. Awesome to see that kind of comparison!

A few comments on them...

CAEdevice -- Highly developed car. It has got the best rear end -in terms of downforce- and there is room for further improvements; for example, it looks like more airflow could reach the top side of the diffuser, increasing its pressure. A more aggressive front end could lead Matteo to victory.

CompetitionCarEngineering / 's Shiny Melon -- It looks like Machin and his alter ego are playing safe: small and gradual improvements over the entire bodykit. However, they may need to risk more to stay near the top, as others are solving their cooling issues.

HP-Racing -- Quite big changes on their car. From the pressure distribution over the top, it looks like it is working pretty well and elegantly. I hope you guys have solved the cooling problems.

JJR -- I can't spot any difference in comparison with the test race car. Not necessarily a good thing for me, as it was a very competitive car already, and playing safe means no performance drop (as it may have happened to me :oops: )

Kineuton -- This is going to be very close to the top. I like the new winglets: I may reintroduce them in Monaco, where efficiency is less important; however, could they be the cause of the very low pressure on top of your bodywork?

Mantium Ray -- Nice development. It also looks better. With no cooling issues, that car is the most probable candidate for victory.

Mercury -- A whole new car from the last time. Hope you can improve the cooling...having bigger exhausts and more linear shapes -as others suggested- may help. Once that's done, you can focus on downforce: the funny part.

Pure Power Racing: Huge improvements on your car! It was already producing a good amount of downforce during the test race, so now it must be very competitive!

RicME -- A working front end was all you needed to beat Machin, your direct opponent, and it seems like it is working pretty well, with lots of high pressure on top of the front wings. I hope the radiators are being fed more generously too!

Talno -- As I previously said, the car looks good and elegant. You needed a more aggressive front wing, and you put it on. The only actual problem I can spot is the low pressure on top of the rear deck, the top side of the diffuser.

TF -- Very different car from the last time. It does look like an improvement. With the more aggressive front end, that car should be very competitive. Anyway, I wuldn't have used the NACA intake...doen't it decrease the pressure of the airflow?

As for me, the car is pretty much identical to the last time. I focused the updates mainly on cooling improvement, and I have solved cooling issues completely. The downside is that I have lost some downforce (actually, I don't know why I've lost so much, as the car is almost identical to the old one!). I'm not going to reveal the exact numbers...let's buid up the suspense...

Anyway, I think there is enough room to break the 10000N wall quite easily.

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

Re: Khamsin Virtual Racecar Challenge 2016

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variante wrote: RicME -- A working front end was all you needed to beat Machin, your direct opponent, and it seems like it is working pretty well, with lots of high pressure on top of the front wings. I hope the radiators are being fed more generously too!
Have 100% engine power so will be interesting to see how close the battle is between the three cars in KVRC2!

Talking of those three, here is a gif with just those cars on show. Its interesting to see how the minor changes between cars effect the the pressures, especially around the leading edge of the sidepod.

Image

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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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variante wrote:CAEdevice -- Highly developed car. It has got the best rear end -in terms of downforce- and there is room for further improvements; for example, it looks like more airflow could reach the top side of the diffuser, increasing its pressure.
Thanks Variante.
Do you mean the top side of the rear diffuser? I don't remember very much about the rear parts of my car: in the last two months I have only worked on the front axle ☺

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LVDH
46
Joined: 31 Mar 2015, 14:23

Re: Khamsin Virtual Racecar Challenge 2016

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variante wrote: Mantium Ray -- Nice development. It also looks better. With no cooling issues, that car is the most probable candidate for victory.
Looking at all of these cars it is a real shame that mine will be running with so little engine power as I do have cooling issues. Many cars will be ahead of me taking valuable championship points.
And now most cars look very refined. I cannot wait for numbers and results anymore. The top two packs should be very close.

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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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LVDH wrote:
variante wrote: Mantium Ray -- Nice development. It also looks better. With no cooling issues, that car is the most probable candidate for victory.
Looking at all of these cars it is a real shame that mine will be running with so little engine power as I do have cooling issues. Many cars will be ahead of me taking valuable championship points.
And now most cars look very refined. I cannot wait for numbers and results anymore. The top two packs should be very close.
The cooling simulation deeply changed the way I manage the flow in the frontal region of my car.
Without considering the cooling needs, during pre season, I obtained 10500N (COP 1.70m) ... when I had to look for a compromise between DF and cooling, the DF dropped around 9000N (COP 1.85m).

I like very much the new rules despite this :)

HP-Racing
HP-Racing
0
Joined: 18 Mar 2016, 00:21
Location: Austria

Re: Khamsin Virtual Racecar Challenge 2016

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machin wrote:
cdsavage wrote: Images for the round 1 entries have been posted here: http://www.khamsinvirtualracecarchallen ... -1/round-1
Ooo... I do like the look of the HP-Racing car... but they're all looking pretty nice!!!
variante wrote: HP-Racing -- Quite big changes on their car. From the pressure distribution over the top, it looks like it is working pretty well and elegantly. I hope you guys have solved the cooling problems.
Thank you for the kind words. We put a lot of effort into fixing the cooling system and are happy with the result. There is still some catching up to do in terms of downforce but we're making progress.

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machin
162
Joined: 25 Nov 2008, 14:45

Re: Khamsin Virtual Racecar Challenge 2016

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RicME85 wrote:Have 100% engine power so will be interesting to see how close the battle is between the three cars in KVRC2!

Talking of those three, here is a gif with just those cars on show. Its interesting to see how the minor changes between cars effect the the pressures, especially around the leading edge of the sidepod.

http://s32.postimg.org/hy1o852qd/output_Yl5_Jhr.gif
I have 100% Power too, so I think it is going to be tight.... My mate (I am going to refer to him as "Team MSM"!) stuck with the "sidepod by-pass restrictors" that I used in the test round: essentially these close off the flow down the side of the sidepod, with the intention of increasing pressure on the cooling inlets: the side effect is that more air flows over the top of the sidepod, hence the lift generated on that leading edge. I decided to get rid of them entirely... I think the reality is that they made very little difference on the inlet pressure; my round 1 car has lots of inlet pressure without them.
COMPETITION CAR ENGINEERING -Home of VIRTUAL STOPWATCH

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Alonso Fan
10
Joined: 06 Apr 2013, 18:21

Re: Khamsin Virtual Racecar Challenge 2016

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sjns wrote:
cdsavage wrote:There were some problems with the simulations for sjns-Racing and SHM Racing - I think Julien is re-running these. I suspect there were also some issues with some of the other simulations - we need to look into this before releasing the results.
Not again! I was so confident I solved the issue on the outlets. I did several runs that worked perfectly. So dissapointing to hear that something is wrong again. Im sorry for the delay. If there is anything i can do let me know.
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Gridiot
Gridiot
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Joined: 23 Jun 2015, 23:41

Re: Khamsin Virtual Racecar Challenge 2016

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variante wrote: Kineuton -- This is going to be very close to the top. I like the new winglets: I may reintroduce them in Monaco, where efficiency is less important; however, could they be the cause of the very low pressure on top of your bodywork?
Indeed, the winglets have decreased pressure on top bodywork more than I would have liked. And disturbance on rear wing is also quite significant. I've probably been too agressive with their design for this first shot... I need to investigate further to determine what I will do about that for next race.

I'm not really confident about the race result, as COP might still be way off the mark.
KVRC Team Kineuton

HP-Racing
HP-Racing
0
Joined: 18 Mar 2016, 00:21
Location: Austria

Re: Khamsin Virtual Racecar Challenge 2016

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Any news on when the results for the first race will be published? We're getting nervous and checking the forum every 20mins. :D

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AratzH
9
Joined: 07 May 2013, 09:24
Location: Michigan

Re: Khamsin Virtual Racecar Challenge 2016

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Hi,

I also got my results. Again 100% power and a lot of overcooling. Actually I sent my car with just 35000mm^2 of cooling intake! I was fine tuning for the flow and I completely forgot about the minimal area rule. Anyway after resubmission my COP went all crazy, so it's going to be really tight. Cars this year look soo much better!

On other matters I have tried the OC-CFD for the first time and apparently all went well except for some final step wher it cannot compute the frontal area and the report is not generated.

This is the error log:

Simulation completion time 2016-05-19 12:07:31 -0400
Post-processing analysis for geometry Race1 Nurburgrind
Running command ["C:/Program Files (x86)/ParaView 3.98.1/bin/pvbatch.EXE", "C:/Program Files (x86)/One-Click CFD/Scripts/ParaView/main.py", "--render3DBW=0.0,-23.5,0.4574999865144491,0.0,1.5,0.4574999865144491", "--loadOpenFoam=analysis.foam,bodystl_patch0,cooling-exhauststl_patch0,cooling_intakestl_patch0,engine-exhauststl_patch0,engine-intakestl_patch0,hx-shape-1stl_patch0,hx-shape-2stl_patch0,susp_frontstl_patch0,susp_rearstl_patch0,wheel_front_leftstl_patch0,wheel_front_rightstl_patch0,wheel_rear_leftstl_patch0,wheel_rear_rightstl_patch0,wing-frontstl_patch0,wing_rearstl_patch0", "--showAsBlackSurface", "--box=0.0,1.5,1.573999958485365,2.011932134628296,5.0,1.0149999745190144", "--showAsBlackWireframe", "-p=Images/frontalArea1.bmp", {:err=>[:child, :out]}]
Qt: Untested Windows version 6.2 detected!
--------------------------------------------------------------------------
WARNING: An invalid value was given for btl_tcp_if_exclude. This
value will be ignored.

Local host: DESKTOP-DOBL4K1
Value: 127.0.0.1/8
Message: Did not find interface matching this subnet
--------------------------------------------------------------------------
Running command ["C:/Program Files (x86)/ParaView 3.98.1/bin/pvbatch.EXE", "C:/Program Files (x86)/One-Click CFD/Scripts/ParaView/main.py", "--render3DBW=0.0,-23.5,0.4574999865144491,0.0,1.5,0.4574999865144491", "--loadOpenFoam=analysis.foam,bodystl_patch0,cooling-exhauststl_patch0,cooling_intakestl_patch0,engine-exhauststl_patch0,engine-intakestl_patch0,hx-shape-1stl_patch0,hx-shape-2stl_patch0,susp_frontstl_patch0,susp_rearstl_patch0,wheel_front_leftstl_patch0,wheel_front_rightstl_patch0,wheel_rear_leftstl_patch0,wheel_rear_rightstl_patch0,wing-frontstl_patch0,wing_rearstl_patch0", "--showAsBlackWireframe", "--box=0.0,1.5,1.573999958485365,2.011932134628296,5.0,1.0149999745190144", "--showAsBlackSurface", "-p=Images/frontalArea2.bmp", {:err=>[:child, :out]}]
Qt: Untested Windows version 6.2 detected!
--------------------------------------------------------------------------
WARNING: An invalid value was given for btl_tcp_if_exclude. This
value will be ignored.

Local host: DESKTOP-DOBL4K1
Value: 127.0.0.1/8
Message: Did not find interface matching this subnet
--------------------------------------------------------------------------
Error occured with message:
Error when assessing frontal area. It looks like the geometry was not properly modelled.
Backtrace: C:/Users/ahpin/AppData/Local/Temp/ocrCB84.tmp/src/mainOneClickCFDVehicle.rb:1038:in `getFrontalArea'
C:/Users/ahpin/AppData/Local/Temp/ocrCB84.tmp/src/mainOneClickCFDVehicle.rb:1223:in `block in postProcess'
C:/Users/ahpin/AppData/Local/Temp/ocrCB84.tmp/src/mainOneClickCFDVehicle.rb:1155:in `open'
C:/Users/ahpin/AppData/Local/Temp/ocrCB84.tmp/src/mainOneClickCFDVehicle.rb:1155:in `postProcess'
C:/Users/ahpin/AppData/Local/Temp/ocrCB84.tmp/src/mainOneClickCFDVehicle.rb:244:in `start'
C:/Users/ahpin/AppData/Local/Temp/ocrCB84.tmp/src/mainOneClickCFDVehicle.rb:1726:in `<main>'
Press enter to close the window


Any ideas on what might be happening???
MVRC -> TF

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Alonso Fan
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Joined: 06 Apr 2013, 18:21

Re: Khamsin Virtual Racecar Challenge 2016

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I get this issue too. Final report not generating
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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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It sometimes happens the same to me (I have the suspect that is related to the internet connection or firewall).

If you look in the previous pages, Julien wrote the instructions to compute the pressure differential manually with Paraview.

There is no a solution for the cop since I don't know how occfd computes it, but Julien said that in the future it will be written in a txt file.

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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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PS: I was wondering about results too... the next submission date is not so far, I hope it will not be delayed.