[MVRC] Mantium Virtual Racecar Challenge 2019 (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.
CAEdevice
38
User avatar
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by CAEdevice » Tue Aug 13, 2019 5:49 pm

TalnoRacing wrote:
Tue Aug 13, 2019 4:42 pm
Here is the TalnoRacing TR19 for this season's challenge. I was not able to run any CFD, so this is a best guess gut feel design. But I had a lot of fun modelling a sleek looking beast. :D
Nice, clean, quite similar to mine, but more aggressive. Congratulations!

machin
184
User avatar
Joined: Tue Nov 25, 2008 1:45 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by machin » Tue Aug 13, 2019 7:27 pm

TalnoRacing wrote:
Tue Aug 13, 2019 4:42 pm
Here is the TalnoRacing TR19 for this season's challenge. I was not able to run any CFD, so this is a best guess gut feel design. But I had a lot of fun modelling a sleek looking beast. :D

https://i284.photobucket.com/albums/ll3 ... xekzlu.jpg
Nice! The first proper car reveal! 👍👍👍
COMPETITION CAR ENGINEERING -Home of VIRTUAL STOPWATCH

rjsa
69
Joined: Fri Mar 02, 2007 2:01 am

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by rjsa » Wed Aug 14, 2019 10:22 am

LVDH wrote:
Tue Aug 13, 2019 10:11 am

Code: Select all

lRef        3.4;
to

Code: Select all

lRef        1.0;
Then you can run the case.
This is for the fast option only, right?

CAEdevice
38
User avatar
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by CAEdevice » Wed Aug 14, 2019 10:24 am

rjsa wrote:
Wed Aug 14, 2019 10:22 am
LVDH wrote:
Tue Aug 13, 2019 10:11 am

Code: Select all

lRef        3.4;
to

Code: Select all

lRef        1.0;
Then you can run the case.
This is for the fast option only, right?
I think it is necessary only for the standard template: the "fast" set up includes the correct value of lRef by default (Windows version).

rjsa
69
Joined: Fri Mar 02, 2007 2:01 am

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by rjsa » Wed Aug 14, 2019 12:07 pm

I ‘ve gone through the file and the occurrences of lRef read 1 here. Will check again.

Did rake get axed?

rjsa
69
Joined: Fri Mar 02, 2007 2:01 am

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by rjsa » Wed Aug 14, 2019 12:25 pm

Yeah, 3.4. I,ve seen lRef 1 somewhere, must have set a fast by mistake while messing around.

CAEdevice
38
User avatar
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by CAEdevice » Wed Aug 14, 2019 3:35 pm

rjsa wrote:
Wed Aug 14, 2019 12:07 pm
I ‘ve gone through the file and the occurrences of lRef read 1 here. Will check again.

Did rake get axed?
No it didn't. It is called "pitch" in the MFlow GUI (don't forget to hit "apply")

rjsa
69
Joined: Fri Mar 02, 2007 2:01 am

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by rjsa » Wed Aug 14, 2019 5:22 pm

CAEdevice wrote:
Wed Aug 14, 2019 3:35 pm
rjsa wrote:
Wed Aug 14, 2019 12:07 pm
I ‘ve gone through the file and the occurrences of lRef read 1 here. Will check again.

Did rake get axed?
No it didn't. It is called "pitch" in the MFlow GUI (don't forget to hit "apply")
Negative angles, right?

CAEdevice
38
User avatar
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by CAEdevice » Wed Aug 14, 2019 5:39 pm

rjsa wrote:
Wed Aug 14, 2019 5:22 pm
CAEdevice wrote:
Wed Aug 14, 2019 3:35 pm
rjsa wrote:
Wed Aug 14, 2019 12:07 pm
I ‘ve gone through the file and the occurrences of lRef read 1 here. Will check again.

Did rake get axed?
No it didn't. It is called "pitch" in the MFlow GUI (don't forget to hit "apply")
Negative angles, right?
yes, range from -1° to 0° (nose down)

LVDH
28
User avatar
Joined: Tue Mar 31, 2015 1:23 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by LVDH » Thu Aug 15, 2019 2:43 pm

rjsa wrote:
Wed Aug 14, 2019 5:22 pm
CAEdevice wrote:
Wed Aug 14, 2019 3:35 pm
rjsa wrote:
Wed Aug 14, 2019 12:07 pm
I ‘ve gone through the file and the occurrences of lRef read 1 here. Will check again.

Did rake get axed?
No it didn't. It is called "pitch" in the MFlow GUI (don't forget to hit "apply")
Negative angles, right?
MFlow should correct it if you do something illegal while having an MVRC template selected.


I have been working pretty hard on a new MFlow release (not only because of your reported bugs) but still cannot package it up for Windows. So there will simply be no new release for the race. This means you have to deal with two bugs.

Depending on what MVRC template you use, the value for lRef is wrong in the system/forceCoeffs file. After building a simulation and before running it, you have to open the file with a text editor and change the value from 3.4 to 1.0. This issue affects the calculation of the CoP.
The second bug is related to the force values on the single parts, you find in the report. These values are all offset by the porous drag of your HX. Essentially they are simply all wrong. The total forces on the car are calculated correctly, though.

jjn9128
244
User avatar
Joined: Tue May 02, 2017 10:53 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by jjn9128 » Thu Aug 15, 2019 5:59 pm

CAEdevice wrote:
Sat Aug 10, 2019 6:38 pm
It would be amazing having you as a competitor. Why don't you try with a couple of races?
Go on then


Not going to be able to test it though... think I have all the parts in the right places. How is suspension affected with rake? As it's just rotating about the front axle the floor will be moving further from the ground!?
#aerogandalf

CAEdevice
38
User avatar
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by CAEdevice » Thu Aug 15, 2019 6:15 pm

jjn9128 wrote:
Thu Aug 15, 2019 5:59 pm
CAEdevice wrote:
Sat Aug 10, 2019 6:38 pm
It would be amazing having you as a competitor. Why don't you try with a couple of races?
Go on then
https://drive.google.com/file/d/1nGDXkz ... sp=sharing

Not going to be able to test it though... think I have all the parts in the right places. How is suspension affected with rake? As it's just rotating about the front axle the floor will be moving further from the ground!?
Congratulations! This car is one step above mine about modeling: it reminds me one car of a past challenge that was almost dominant.
Last edited by CAEdevice on Thu Aug 15, 2019 6:41 pm, edited 1 time in total.

CAEdevice
38
User avatar
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by CAEdevice » Thu Aug 15, 2019 6:40 pm

What happens if the engine inlet surface is a bit larger than then the duct and it overlaps it by 1-2 mm?
I have the suspect that I have problems when exporting the STL and the surfaces deos not perfectly join.

LVDH
28
User avatar
Joined: Tue Mar 31, 2015 1:23 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by LVDH » Thu Aug 15, 2019 7:15 pm

Scaling these kind of surfaces up so they intersect surrounding geometry is a very good idea. You have to make sure that the remaining surface meetings the requirements on surface area.

CAEdevice
38
User avatar
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by CAEdevice » Thu Aug 15, 2019 7:21 pm

LVDH wrote:
Thu Aug 15, 2019 7:15 pm
Scaling these kind of surfaces up so they intersect surrounding geometry is a very good idea. You have to make sure that the remaining surface meetings the requirements on surface area.
No problem, the remaining surface is much larger then required.