[MVRC] Mantium 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.
User avatar
CAEdevice
49
Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

RicME85 wrote:
CAEdevice wrote:
RicME85 wrote:Andre and Matteo, what you have to understand is that not all of us are professionals with a background in this subject nor are we all students in this field, we started doing this stuff for fun when it was originally but a competition on aesthetics (Formula Sketch) and then took it further when Julian and Nick sorted out KVRC and from there it's snowballed to where we are now with MVRC.

I applaud all the work Andre has done but we really need the intro class back.
I can understand what are you saying. Next year I will release a complete car and (maybe, it depends on the free time I will have) a complete virtual machine with all you need to simulate the car.

The question is: would it be funny anyway?
You mean would it be fun using a complete car? Yeah it would be more fun than starting with a blank slate. I still think the intro class should come with a couple of 'bolt on' parts that are interchangeable ie a high, medium and low downforce front wing and the same for the rear. This would allow easier start up for complete beginners and would be a good base for those who have got the basics down but want to advance up the grid. Even with these pre-supplied wings you would get enough differences between the cars due to the combination of the wings and AoA entrants may use. Could have different nose solutions too, a high one like AlonsoFan's or a low one like yours. A wide diffuser exit or a narrower one. A more aggressive diffuser profile or a gentler profile.
Thanks, I will consider all your suggestions, even if it is not always easy: take the diffuser for example.

I risk to loose the challenge (among other issues) beacuse I did not consider that a low df rear wing would have not helped the rear diffuser. The diffuser was the same, but with the low df wing it was much more affected by flow separation (this is a partial cause of my convergence issues). (C)FD is a difficult science I suppose :)

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

I sometimes feel the same, RichME85. sometimes I just feel like playing games after a hard day at uni. I could of course use that time to develop my car, (or revise of course) but sketchup is a pain and a half to deal with. it demotivates you somewhat. I wanted to fix my cooling for the last race. couldn't find the motivation and time to do it. All I ended up doing is slightly smoothing out the ducts and changing the front wing. I was enjoying AC and GP3 too much. I think sketchup is a big part of this motivation problem. thankfully through my second year at uni I have gained much more experience in SolidWorks and i'm seriously thinking of trying to design my next car using it.
SHR Modding
Youtube
Twitter
Discord

Sound Developer for Reiza Studios
Sound Modder for Assetto Corsa

rjsa
rjsa
51
Joined: 02 Mar 2007, 03:01

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

A question about paraview: Is there a way I can get a U diagram made for a set Z plane like the ones in the surfaces folder of the post processor (U_xNormal_00*.vtk) ? To be used with surfacelic.

EDIT: Two, in fact: Why would a case miss some of those surfaces? The last one has no Z section at all.

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

Can someone tell me why the wheel arch guidelines are missing?

Image
SHR Modding
Youtube
Twitter
Discord

Sound Developer for Reiza Studios
Sound Modder for Assetto Corsa

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

It depends on the original step, there is an issue with that surface.
Last edited by CAEdevice on 15 Dec 2016, 12:07, edited 1 time in total.

rjsa
rjsa
51
Joined: 02 Mar 2007, 03:01

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

I'm missing some details on the diffuser. So I'd like to add more steps.

Besides that sometimes some of the slices are not generated at all. Last run I did two cases, one with and the other without the diffuser channels. All the same geometry but the channels. The sans channels version did not produce a single Z slice. And missed a bunch of Y and Z too. Where should I look to fix it?

rjsa
rjsa
51
Joined: 02 Mar 2007, 03:01

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

I found it, cuttingplanes in system.

Now what can I do about the randomly failing slices?

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

Hi, wich are the plans about the solver next year?
I'm going to switch to a Linux (Ubuntu would be ok? Mint?), so I am wondering:

1) The solver will be OF1606+ (or its evolution) or the "standard" edition OF4.1 (or its evolution)?
2) The post processing utility (not the GUI) will be available on Linux too?

User avatar
LVDH
46
Joined: 31 Mar 2015, 14:23

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

rjsa wrote:I found it, cuttingplanes in system.

Now what can I do about the randomly failing slices?
I have no idea why this happens. The Mercury car sometimes gives me these issue as as well. I suspect that it is a problem with OF but so far I have no clue. If you could please send me a case where the cuttings plains fail, I might have a chance to figure out what is happening.


CAEdevice wrote:Hi, wich are the plans about the solver next year?
I'm going to switch to a Linux (Ubuntu would be ok? Mint?), so I am wondering:

1) The solver will be OF1606+ (or its evolution) or the "standard" edition OF4.1 (or its evolution)?
2) The post processing utility (not the GUI) will be available on Linux too?
Yes, for the challenge the plus version is best. It offers small improvements but mainly because of the Windows version.
The post-processing utility works on Linux as well. I mostly sweat about getting things working on Windows.

About Linux I have noticed something as I did a switch recently as well. The solver times of OF can change (a lot). I think it is some of the libs to solve crazy math stuff or the MPI implementation on the various systems. But I have no idea if Ubuntu or Mint are configured for super OF performance.

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

LVDH wrote:
rjsa wrote:I found it, cuttingplanes in system.

Now what can I do about the randomly failing slices?
I have no idea why this happens. The Mercury car sometimes gives me these issue as as well. I suspect that it is a problem with OF but so far I have no clue. If you could please send me a case where the cuttings plains fail, I might have a chance to figure out what is happening.


CAEdevice wrote:Hi, wich are the plans about the solver next year?
I'm going to switch to a Linux (Ubuntu would be ok? Mint?), so I am wondering:

1) The solver will be OF1606+ (or its evolution) or the "standard" edition OF4.1 (or its evolution)?
2) The post processing utility (not the GUI) will be available on Linux too?
Yes, for the challenge the plus version is best. It offers small improvements but mainly because of the Windows version.
The post-processing utility works on Linux as well. I mostly sweat about getting things working on Windows.

About Linux I have noticed something as I did a switch recently as well. The solver times of OF can change (a lot). I think it is some of the libs to solve crazy math stuff or the MPI implementation on the various systems. But I have no idea if Ubuntu or Mint are configured for super OF performance.
Thanks, wich version of Linux would you suggest for a single workstation (not cluster, it is a desktop 6900K + 64gb available for CFD)?

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

CAEdevice wrote:It depends on the original step, there is an issue with that surface.
Do you know the radius of the arches and their positioning relative to the other guides? I can sketch them in myself and recreate the surface
SHR Modding
Youtube
Twitter
Discord

Sound Developer for Reiza Studios
Sound Modder for Assetto Corsa

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

Alonso Fan wrote:
CAEdevice wrote:It depends on the original step, there is an issue with that surface.
Do you know the radius of the arches and their positioning relative to the other guides? I can sketch them in myself and recreate the surface
Here are the dimensions I used this year (copied from 2015 template): I don't think that they could change more than 1mm (never had problems with the legality check using them during 2016).

Image

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

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

CAEdevice wrote:
Alonso Fan wrote:
CAEdevice wrote:It depends on the original step, there is an issue with that surface.
Do you know the radius of the arches and their positioning relative to the other guides? I can sketch them in myself and recreate the surface
Here are the dimensions I used this year (copied from 2015 template): I don't think that they could change more than 1mm (never had problems with the legality check using them during 2016).

https://dl.dropboxusercontent.com/u/522 ... nsions.jpg

Thanks
SHR Modding
Youtube
Twitter
Discord

Sound Developer for Reiza Studios
Sound Modder for Assetto Corsa

rjsa
rjsa
51
Joined: 02 Mar 2007, 03:01

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

LVDH wrote:
rjsa wrote:I found it, cuttingplanes in system.

Now what can I do about the randomly failing slices?
I have no idea why this happens. The Mercury car sometimes gives me these issue as as well. I suspect that it is a problem with OF but so far I have no clue. If you could please send me a case where the cuttings plains fail, I might have a chance to figure out what is happening.
OK, I'm sending the full case.

On the question about adding an extra cutting plane: How can I do it? Just adding a code block to system/cuttingPlanes didn't do the trick.

User avatar
LVDH
46
Joined: 31 Mar 2015, 14:23

Re: [MVRC] Mantium Virtual Racecar Challenge 2016

Post

rjsa wrote: On the question about adding an extra cutting plane: How can I do it? Just adding a code block to system/cuttingPlanes didn't do the trick.
Well it should. Maybe this is the first step in understanding why this is failing.