[MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post here information about your own engineering projects, including but not limited to building your own car or designing a virtual car through CAD.
AeroStarKnight
AeroStarKnight
0
Joined: 10 May 2025, 12:46

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

LVDH wrote:
18 May 2025, 20:22
From my experience, every software will have options on how to import the files.
This can be a bit obfuscated / confusing, though.
The ultimate test you can do is use MFlow.
I know that not every team uses it. And that it is perfectly fine.
Just consider that is is basically just an executable to have on your PC (yes, Windows may at random, without warning, just delete it...).
But if you work with the supplied stl files, together with MFlow, you are very much doing what will be the official simulation. So, just to at least visually understand, if you are doing everything correctly, I advise to load the car once into MFlow to just have a look at it.
Yes. I understood. I have installed MFlow and will run Simulations as soon as my design is ready.
Thank You!

janci_kp
janci_kp
3
Joined: 01 Oct 2024, 18:19

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

Hi guys, I can’t find it anywhere here on the forum neither in the regs. What minimal radius for EC have we agreed to use? I made mine with 50mm to be on the safe side but I want to push my performance a little bit more
EaJ Racing

User avatar
CAEdevice
51
Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

janci_kp wrote:
19 May 2025, 07:47
Hi guys, I can’t find it anywhere here on the forum neither in the regs. What minimal radius for EC have we agreed to use? I made mine with 50mm to be on the safe side but I want to push my performance a little bit more
Hi, what does EC mean?

janci_kp
janci_kp
3
Joined: 01 Oct 2024, 18:19

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

CAEdevice wrote:
19 May 2025, 08:54
janci_kp wrote:
19 May 2025, 07:47
Hi guys, I can’t find it anywhere here on the forum neither in the regs. What minimal radius for EC have we agreed to use? I made mine with 50mm to be on the safe side but I want to push my performance a little bit more
Hi, what does EC mean?
EC=Engine Cover
EaJ Racing

User avatar
CAEdevice
51
Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

janci_kp wrote:
19 May 2025, 09:16
CAEdevice wrote:
19 May 2025, 08:54
janci_kp wrote:
19 May 2025, 07:47
Hi guys, I can’t find it anywhere here on the forum neither in the regs. What minimal radius for EC have we agreed to use? I made mine with 50mm to be on the safe side but I want to push my performance a little bit more
Hi, what does EC mean?
EC=Engine Cover
No limits for Race 02 (except, as usual, for 10mm rule), the application of the 1R rule will start from Race 03.
In my opinion R = 50 mm would be a good choice, maybe 25 mm too.

User avatar
LVDH
51
Joined: 31 Mar 2015, 14:23

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

Thanks for this.

Today, I have some CFD images for you:
Image
https://mantiumchallenge.com/cfd-images ... mvrc-2025/

User avatar
yinlad
37
Joined: 08 Nov 2019, 20:10

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

LVDH wrote:
20 May 2025, 11:55
Thanks for this.

Today, I have some CFD images for you:
https://mantiumchallenge.com/wp-content ... images.gif
https://mantiumchallenge.com/cfd-images ... mvrc-2025/
Well if that doesn’t highlight how well JJR is utilising in wash at the rear, nothing will
MVRC - Panthera

User avatar
LVDH
51
Joined: 31 Mar 2015, 14:23

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

yinlad wrote:
20 May 2025, 12:33
Well if that doesn’t highlight how well JJR is utilising in wash at the rear, nothing will
Yepp, his rear wing and diffuser seem to be really happy about this.

User avatar
yinlad
37
Joined: 08 Nov 2019, 20:10

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

LVDH wrote:
20 May 2025, 15:01
yinlad wrote:
20 May 2025, 12:33
Well if that doesn’t highlight how well JJR is utilising in wash at the rear, nothing will
Yepp, his rear wing and diffuser seem to be really happy about this.
I hope mine can be too. I was cursed with a massive separation bubble at the rear of the sidepod which ultimately limited the inwash I was creating. I’m hopeful that I can find some gains by fixing that among some other things for Monaco, I’m sure it won’t take long for others to catch up now.
MVRC - Panthera

k.ko100v
k.ko100v
18
Joined: 31 Aug 2012, 06:58

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

I would like to rise two topics:

1. Regarding the Scrutineering report, one of the warning I had is 2.5
2.5 Only the parts specified in rule 2.1 and the text file in rule 2.4 should be included. No other guide or provided mandatory parts must be submitted. The combined size of the stl files (before compression) must be below 160MB for ASCII stl, or below 40MB for binary stl.
2.1 An entry should be a single compressed archive file (ZIP etc) named using the format “<team>_<round>_<version>”. It must contain a directory structure “input_files/geometry/“ which contains:

A directory named “special_bc”:
(rule 7) One engine inlet surface, with a filename starting with “engineIn”
A directory named “monitoring_surfaces”:
(rule 6) Each heat exchanger monitoring surface as a separate stl-file (front face of heat exchanger translated rearward along its normal by 30mm)
A directory named “porous_media”:
(rule 6) Each (left and right hand sides) heat exchanger volume as a separate stl file
A directory named “high_res_surfaces” (rule 9.2).
Directories “frt_suspension” and “rr_suspension” (rule 14).
A directory named “vehicle_body”: All remaining bodywork.
2.4 A plain text file must be included in the archive to specify the offset for the following parts compared to their position as supplied in the parts file, even if they have not been moved, stating the following:

Vehicle rake in deg
Vehicle ride height adjustment in mm
I double checked everything and do not know what to change, which according to the rules will lead to a penalty, which will be pity, taking in to account all the effort I've put in to this competition.

May I get the exact reason for not meeting the 2.5 rule?

2. I noticed that the exhaust flow is missing or it is relatively low comparing it to the results I had back in 2020 (my first and only attempt in MVRC)
Image

This is how it looks in paraview:
Image

And the triangles of the "MAND_Exhaust_Outlet_Surface":
Image

Most probably this is affecting all the participants.

Regards,
Krasen

User avatar
LVDH
51
Joined: 31 Mar 2015, 14:23

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

k.ko100v wrote:
22 May 2025, 13:11
I double checked everything and do not know what to change, which according to the rules will lead to a penalty, which will be pity, taking in to account all the effort I've put in to this competition.

May I get the exact reason for not meeting the 2.5 rule?
Yepp, thanks for asking. And as a small preface: The rules are not to annoy people or take away results from their hard work. Most rules are to keep sure you all have similar cars and do not somehow create a Le Mans style car, but F1 cars. This rule is mainly to ensure smooth racing operations in the background. To an extent it is also to avoid a potential way to directly cheat.

What you did, is submit many parts that you should not have, including the mandatory parts.

The good thing with our current penalty system is that it works very well. Many years ago, there were always a lot of rule infractions. These have almost gone down to zero. That we had so many last race, is I assume for the most part because of the new rules an new teams.


I am not sure what is going on there with the exhaust flow. I can imagine what it could be. But for this race, we will keep everything as it is, as all teams will be affected the same. I will fix this together with the other issue, PurePowerRacing pointed out.

KaraszG
KaraszG
0
Joined: 23 May 2025, 20:43

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

Hi,

Happy to be here. I'd like to make an entry with our car, so we're newbies as it can be, if I ask anything trivial to you, I'm sorry, we're still processing the rules and workflows.

We completed the CAD design and are trying to run the first case with MantiumFlow. I've got the following errors during the STL import:

Warning: Something went wrong with the CoR calculation, CoR set to 0,0,0
Warning: Front wheels seem to be positioned incorrectly. In MVRC they should be in global (0,0,0.3).
Warning: Rear wheels seem to be positioned incorrectly. In MVRC they should be in global (3.4,0,0.3).
Warning: Car seems to extend maximum allowed dimensions.
Calculated ride height at: 0.04000


I also tried to use the V6 rule geometry for front and rear suspension/wheel/etc., but still the same warnings.

Moreover, I had terminated runs during the tutorial of the shark and car_coarse cases:

ERROR: Failed to post close command error 1726
ERROR: unable to tear down the job tree. exiting...


I'm hoping you can answer these questions. We are stuck with them currently, and our excitement grows getting closer to the submission deadline.

Thank you in advance and wish a lovely (and competitive) race weekend for all of you!
Kind Regards,

User avatar
G-raph
30
Joined: 27 Jun 2022, 00:50

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

Hi everyone!

Very interesting results from the first race, and congratulations to JJR!

I have run my first CFD simulation today, and as I have a disappointingly long list of issues to fix, I would like to request the 2 days extension for the first time, please.

I think there is a problem with the Mandatory Suspension parts movements in MFlow. My suspensions sit in the right place when I import them in MFlow (so nothing to do with Matteo's issue), but as soon as Rake and/or RH adjustement is applied, the Mandatory suspension rods move weirdly and quite differently to the parts that I have designed (which appear to move sensibly). Can you please double-check that, and ideally remove these parts for the official simulations?
I wonder if this issue gave unexpected results to multiple competitors in the first race. Thank you in advance.

User avatar
The Rusted One
1
Joined: 07 Aug 2023, 08:33

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

G-raph wrote:
23 May 2025, 23:30
Hi everyone!

Very interesting results from the first race, and congratulations to JJR!

I have run my first CFD simulation today, and as I have a disappointingly long list of issues to fix, I would like to request the 2 days extension for the first time, please.

I think there is a problem with the Mandatory Suspension parts movements in MFlow. My suspensions sit in the right place when I import them in MFlow (so nothing to do with Matteo's issue), but as soon as Rake and/or RH adjustement is applied, the Mandatory suspension rods move weirdly and quite differently to the parts that I have designed (which appear to move sensibly). Can you please double-check that, and ideally remove these parts for the official simulations?
I wonder if this issue gave unexpected results to multiple competitors in the first race. Thank you in advance.
I've had that problem for a long time but no one has replied yet, so thanks for bringing that up again. I hope it can fixed before the sims for Monaco cause it does have a big effect.
Rusted GP

User avatar
CAEdevice
51
Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2025 (Grand Prix Cars)

Post

G-raph wrote:
23 May 2025, 23:30
Hi everyone!

Very interesting results from the first race, and congratulations to JJR!

I have run my first CFD simulation today, and as I have a disappointingly long list of issues to fix, I would like to request the 2 days extension for the first time, please.

I think there is a problem with the Mandatory Suspension parts movements in MFlow. My suspensions sit in the right place when I import them in MFlow (so nothing to do with Matteo's issue), but as soon as Rake and/or RH adjustement is applied, the Mandatory suspension rods move weirdly and quite differently to the parts that I have designed (which appear to move sensibly). Can you please double-check that, and ideally remove these parts for the official simulations?
I wonder if this issue gave unexpected results to multiple competitors in the first race. Thank you in advance.
I agree with removing the template representing the structural core of the suspension arms for the Monaco Race (Race 2), since it's causing issues. While we're at it, can we also remove it from the geometry used for the Race 01 calculations? :)

By the way, i think I have the same issue:

https://www.caedevice.net/SERVER/MVRC/2 ... w_only.jpg

Welcome back, G-Raph! For a few days I thought I might make it to the podium, but I think I’ll be stuck in 4th place.
Last edited by CAEdevice on 24 May 2025, 11:08, edited 1 time in total.