[MVRC] Mantium Virtual Racecar Challenge 2018

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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LVDH
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Joined: Tue Mar 31, 2015 1:23 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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schwepes wrote:
Mon Jul 09, 2018 7:23 pm
Question regarding new bodywork template.
Diffuser with strakes need to be within bodywork template?
https://imgur.com/a/uXRfuEv
https://imgur.com/a/Eppk4km
Only yesterday I asked myself the same question. I think I should only have that cutout behind the rear wheels as strakes going all the way to the floor would look cooler. But right now even the strakes have to stay inside of the template.

A15013950 wrote:
Mon Jul 09, 2018 11:20 pm
When Is the deadline for registering?
There is no deadline, you can even enter during the season.


etsmc wrote:
Tue Jul 10, 2018 12:37 am
so how exactly are we setting the rake?? do we need to model it with the rake already built in or do we model it with 0deg and then set the rake in the software?
Yes, very good question. I should have pointed that out. You design as you always did. There is now a new option in the settings. Here you can enter the rake. Do not forget to apply the new setting.

etsmc wrote:
Tue Jul 10, 2018 2:07 am
so software, cool!
not been able to log in yet so cant download the new version of the software
Are you not MercuryMotorsport? You should be able to log in again, or you just did not have the time?

etsmc
etsmc
7
Joined: Wed Apr 04, 2012 12:20 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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LVDH wrote:
Tue Jul 10, 2018 7:14 am
etsmc wrote:
Tue Jul 10, 2018 2:07 am
so software, cool!
not been able to log in yet so cant download the new version of the software
Are you not MercuryMotorsport? You should be able to log in again, or you just did not have the time?
That's Me
When I head to the Mantium Challenge page and click the Log On in the menu I get no options to log in.
I did, however, find if I went to the MantiumFlow Q&A there was a login box there and that worked.

JJR
JJR
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Joined: Fri Jul 12, 2013 7:02 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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Hi!

Nice to get going again!
Will we use same OF version as last year? And what about fvSchemes, fvSolutions and DarcyForchheimerCoeffs? Are there any changes from last year ?

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CAEdevice
40
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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JJR wrote:
Tue Jul 10, 2018 8:04 am
Hi!

Nice to get going again!
Will we use same OF version as last year? And what about fvSchemes, fvSolutions and DarcyForchheimerCoeffs? Are there any changes from last year ?
Hi JJR.

I have the same doubt: in the "default settings" file, there is a line about OF 2017

Code: Select all

local_OF_location=C:\Program Files\blueCFD-Core-2017
Should we install blueCFD2017 instead of 2016?

Update: it looks like blueCFD-Core-2017 is required, but 2017-1 or 2017-2?

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CAEdevice
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Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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Is there a way to set the rake using the command line?

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Team_Bart
2
Joined: Tue Jul 10, 2018 6:26 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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Sorry I posted the following in the old thread:

Hi, I'm new here and would like to join the competition for this year. Now I have a question about the HEX rotation. The rulebook stated about the heat exchanger rotation: "The planar shapes may be rotated around the Y-axis only. Any such rotation must be no more than 60 degrees from a forward-facing orientation." I Interpret this as drawn in the attached figure. Here the dotted line is a HEX surface. However when doing so, MantiumFlow gives an error, saying the heat exchanger is rotated more than allowed. So what is exactly meant by this rule?
Imagehttps://ibb.co/gYk9bo

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CAEdevice
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Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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Hi Team_Bart, the images seems to be correct. Have you tried with a sligthly smaller angle (59°)?

An image with the section of the car would help.

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Team_Bart
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Joined: Tue Jul 10, 2018 6:26 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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CAEdevice wrote:
Tue Jul 10, 2018 8:01 pm
Hi Team_Bart, the images seems to be correct. Have you tried with a sligthly smaller angle (59°)?

An image with the section of the car would help.
Yes, tried for 50 degrees as well but the same error is there. I used the case where the HEX is leaning bachwards btw. I can show an image with the car tomorrow (since I have no acces to the file atm) if it is not clear yet.

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CAEdevice
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Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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Team_Bart wrote:
Tue Jul 10, 2018 8:27 pm
CAEdevice wrote:
Tue Jul 10, 2018 8:01 pm
Hi Team_Bart, the images seems to be correct. Have you tried with a sligthly smaller angle (59°)?

An image with the section of the car would help.
Yes, tried for 50 degrees as well but the same error is there. I used the case where the HEX is leaning bachwards btw. I can show an image with the car tomorrow (since I have no acces to the file atm) if it is not clear yet.
I tested the rotation last year (45°) and the software worked (even if the results were not good). Let's take a look to a local section tomorrow.

etsmc
etsmc
7
Joined: Wed Apr 04, 2012 12:20 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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so I have a simulation running at the moment using blueCFD-Core-2017-2 and the latest MantiumFlow, the only geometry I have is wheels in the frt_wheels and frr_wheels folder and the rear wing in the high res folder.
It seems to be taking a lot longer...
Time = 19

smoothSolver: Solving for Ux, Initial residual = 0.18640888, Final residual = 0.00040734291, No Iterations 2
smoothSolver: Solving for Uy, Initial residual = 0.205356, Final residual = 0.00025854882, No Iterations 2
smoothSolver: Solving for Uz, Initial residual = 0.27623981, Final residual = 0.0003475833, No Iterations 2
GAMG: Solving for p, Initial residual = 0.44512728, Final residual = 0.004415026, No Iterations 16
GAMG: Solving for p, Initial residual = 0.0017387356, Final residual = 1.3195199e-005, No Iterations 17
time step continuity errors : sum local = 2.8274649e-013, global = 7.4193289e-016, cumulative = 9.599932e-016
smoothSolver: Solving for omega, Initial residual = 0.0039757704, Final residual = 3.0044545e-006, No Iterations 2
smoothSolver: Solving for k, Initial residual = 0.33430139, Final residual = 0.00036918317, No Iterations 2
ExecutionTime = 1354.347 s ClockTime = 1354 s

also cm,cd,cl etc are all 0

previously my execution times were mear seconds. anyone else got a simulation to run?

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CAEdevice
40
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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etsmc wrote:
Wed Jul 11, 2018 3:57 am
so I have a simulation running at the moment using blueCFD-Core-2017-2 and the latest MantiumFlow, the only geometry I have is wheels in the frt_wheels and frr_wheels folder and the rear wing in the high res folder.
It seems to be taking a lot longer...
Time = 19

smoothSolver: Solving for Ux, Initial residual = 0.18640888, Final residual = 0.00040734291, No Iterations 2
smoothSolver: Solving for Uy, Initial residual = 0.205356, Final residual = 0.00025854882, No Iterations 2
smoothSolver: Solving for Uz, Initial residual = 0.27623981, Final residual = 0.0003475833, No Iterations 2
GAMG: Solving for p, Initial residual = 0.44512728, Final residual = 0.004415026, No Iterations 16
GAMG: Solving for p, Initial residual = 0.0017387356, Final residual = 1.3195199e-005, No Iterations 17
time step continuity errors : sum local = 2.8274649e-013, global = 7.4193289e-016, cumulative = 9.599932e-016
smoothSolver: Solving for omega, Initial residual = 0.0039757704, Final residual = 3.0044545e-006, No Iterations 2
smoothSolver: Solving for k, Initial residual = 0.33430139, Final residual = 0.00036918317, No Iterations 2
ExecutionTime = 1354.347 s ClockTime = 1354 s

also cm,cd,cl etc are all 0

previously my execution times were mear seconds. anyone else got a simulation to run?
Hi, I will test blueCFD-Core-2017-2 in a couple of days.

I am still studing the new rules, playing with the CAD model without CFD.

Maybe we will have a Valkyrie running with us? At the moment it is as real as our cars :D
I am sure Adrien Newey knows about MVRC and he would not be afraid to compete :wink:

Image

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jjn9128
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Joined: Tue May 02, 2017 10:53 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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CAEdevice wrote:
Tue Jul 10, 2018 10:13 am
Is there a way to set the rake using the command line?
Sorry lurking in here wondering if I should try taking part - you're using OpenFoam right?

Try surfaceTransformPoints:

surfaceTransformPoints -rollPitchYaw '( 0.0000 -0.4946 0.0000)' -translate '( 0.00 0.00 0.020)' <part>.stl <dir/part out>.stl

roll/pitch/yaw in degrees and translate in m
#aerogandalf
"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

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CAEdevice
40
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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jjn9128 wrote:
Wed Jul 11, 2018 10:44 am
CAEdevice wrote:
Tue Jul 10, 2018 10:13 am
Is there a way to set the rake using the command line?
Sorry lurking in here wondering if I should try taking part - you're using OpenFoam right?

Try surfaceTransformPoints:

surfaceTransformPoints -rollPitchYaw '( 0.0000 -0.4946 0.0000)' -translate '( 0.00 0.00 0.020)' <part>.stl <dir/part out>.stl

roll/pitch/yaw in degrees and translate in m
Thank you, this the way to rotate/translate a part in the OF environement. My question was much more trivial: how to launch MFlow from command line, with a rake angle different from zero (in order to generate the case folder with a rotated car: maybe the OF function you indicated will be written by WFlow itself).

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jjn9128
337
Joined: Tue May 02, 2017 10:53 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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CAEdevice wrote:
Wed Jul 11, 2018 11:08 am
Thank you, this the way to rotate/translate a part in the OF environement. My question was much more trivial: how to launch MFlow from command line, with a rake angle different from zero (in order to generate the case folder with a rotated car: maybe the OF function you indicated will be written by WFlow itself).
Sorry I misunderstood. You have series of prompts to automate the process?
#aerogandalf
"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

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CAEdevice
40
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2018

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jjn9128 wrote:
Wed Jul 11, 2018 11:22 am
CAEdevice wrote:
Wed Jul 11, 2018 11:08 am
Thank you, this the way to rotate/translate a part in the OF environement. My question was much more trivial: how to launch MFlow from command line, with a rake angle different from zero (in order to generate the case folder with a rotated car: maybe the OF function you indicated will be written by WFlow itself).
Sorry I misunderstood. You have series of prompts to automate the process?
Yes, MFlow has a nice GUI but I prefer to launch from command line.