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

Post by LVDH » Wed Sep 11, 2019 9:40 am

Thomas2019 wrote:
Wed Sep 11, 2019 9:31 am
Yes, I will drop him an email. No need to run the car again. Those CPU hours can be saved.

Thomas
No problem.

Those Pure Power renders are really nice, I have to put them on the homepage, Yesterday I already had a chance to look at the WWI car. It looks amazing, great CAD skills as well, it is a sculpture. Lets see how fast it is.
And there is a submission from JJR this time. The fight for the top position should be epic. I cannot wait. Variante pulled his deadline extension, so he is probably also up to something.

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

Post by CAEdevice » Wed Sep 11, 2019 9:50 am

LVDH wrote:
Wed Sep 11, 2019 9:40 am
Thomas2019 wrote:
Wed Sep 11, 2019 9:31 am
Yes, I will drop him an email. No need to run the car again. Those CPU hours can be saved.

Thomas
No problem.

Those Pure Power renders are really nice, I have to put them on the homepage, Yesterday I already had a chance to look at the WWI car. It looks amazing, great CAD skills as well, it is a sculpture. Lets see how fast it is.
And there is a submission from JJR this time. The fight for the top position should be epic. I cannot wait. Variante pulled his deadline extension, so he is probably also up to something.
WWI = First World War? Is it a new entry?

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

Post by LVDH » Wed Sep 11, 2019 3:02 pm

I guess shortening it to WWInc. as the designer does is better. Wind Wizzards Incorporated. Very nice car. I forgot under which name the team previously ran.

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

Post by CAEdevice » Wed Sep 11, 2019 3:59 pm

LVDH wrote:
Wed Sep 11, 2019 3:02 pm
I guess shortening it to WWInc. as the designer does is better. Wind Wizzards Incorporated. Very nice car. I forgot under which name the team previously ran.
I can't wait to see the car! The name "Wind wizards" promises great things, but I will always be a JJR fan.

Ft5fTL
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Re: [MVRC] Mantium Virtual Racecar Challenge 2019 (Grand Prix Cars)

Post by Ft5fTL » Thu Sep 12, 2019 11:37 pm

LVDH wrote:
Wed Sep 11, 2019 9:40 am

Those Pure Power renders are really nice, I have to put them on the homepage
There you go then:

Image
Image

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

Post by etsmc » Fri Sep 13, 2019 7:32 am

Finally managed to get a simulation to r7n for my car. Was only 1000 iterations with a base cell size of 0.75 but it ran and i got some results.
Time to start refining and see where i can get for race 3...

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

Post by LVDH » Fri Sep 13, 2019 7:50 am

etsmc wrote:
Fri Sep 13, 2019 7:32 am
Finally managed to get a simulation to r7n for my car. Was only 1000 iterations with a base cell size of 0.75 but it ran and i got some results.
Time to start refining and see where i can get for race 3...
That is very good because it is looking like the shipping costs all the way to Singapore were wasted money. I will give it another shot on Monday with your car. What tool are you using anyway? Your stl files have always looked pretty bad. And it is not only a problem of triangle quality but your actual CAD geometry is not presented very well as long as you are not going for a refined F117 style. Maybe someone else here is using the same tool and can help with the settings.

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

Post by CAEdevice » Fri Sep 13, 2019 7:57 am

LVDH wrote:
Fri Sep 13, 2019 7:50 am
etsmc wrote:
Fri Sep 13, 2019 7:32 am
Finally managed to get a simulation to r7n for my car. Was only 1000 iterations with a base cell size of 0.75 but it ran and i got some results.
Time to start refining and see where i can get for race 3...
That is very good because it is looking like the shipping costs all the way to Singapore were wasted money. I will give it another shot on Monday with your car. What tool are you using anyway? Your stl files have always looked pretty bad. And it is not only a problem of triangle quality but your actual CAD geometry is not presented very well as long as you are not going for a refined F117 style. Maybe someone else here is using the same tool and can help with the settings.
Hi ETMSC, which tools do you use? Most of my job is managing geometry to prepare FEM simulations, if you need help I can take a look. I think LDVH is right, often geomety is bad not because of the STL transaltion but because the original geometry has problems.

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

Post by LVDH » Fri Sep 13, 2019 8:02 am

To give you an idea about thy your car is so problematic and how you can see for yourself:
You can open your stl with Blender, switch to the Edit mode and then select non-manifold edges. You will find a lot. This is how the leading edge of the cooling intake looks like:
Image
You can see that some vertexes of the triangles on the top surface do not match up with those from the rounded edge. This is very problematic and hard to repair with most remeshing software.

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

Post by CAEdevice » Fri Sep 13, 2019 8:07 am

LVDH wrote:
Fri Sep 13, 2019 8:02 am
To give you an idea about thy your car is so problematic and how you can see for yourself:
You can open your stl with Blender, switch to the Edit mode and then select non-manifold edges. You will find a lot. This is how the leading edge of the cooling intake looks like:
https://mantiumchallenge.com/wp-content ... _issue.png
You can see that some vertexes of the triangles on the top surface do not match up with those from the rounded edge. This is very problematic and hard to repair with most remeshing software.
I don't think that the STL converter simply miss to join the surfaces (if so, just change the tool for the conversion, but looking at the image it looks that STL conversion is not that bad). Probably the original surfaces are not attached and the "accuracy" of the 3D engine is not enough. Wich software are you (ETMSC) using? Are the units set correctly?

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

Post by daniellammers » Fri Sep 13, 2019 10:43 am

Is it worth it to have a go at the Mantium challenge on my own, without any aerodynamic experience?
I've got four years of experience in SolidWorks though
Last edited by daniellammers on Fri Sep 13, 2019 10:55 am, edited 1 time in total.
You won't catch me driving a race car that I have built.

- Colin Chapman

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

Post by etsmc » Fri Sep 13, 2019 10:51 am

Unfortunately I am still using sketch up as i just cant get my head around inventor or freecad. I am using a plug in called curviloft i think its called to create some of the surfaces just like the area you pointed out :(

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

Post by CAEdevice » Fri Sep 13, 2019 11:19 am

daniellammers wrote:
Fri Sep 13, 2019 10:43 am
Is it worth it to have a go at the Mantium challenge on my own, without any aerodynamic experience?
I've got four years of experience in SolidWorks though
I started without any aerodynamics background, it has been useful to learn.

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

Post by CAEdevice » Fri Sep 13, 2019 11:20 am

etsmc wrote:
Fri Sep 13, 2019 10:51 am
Unfortunately I am still using sketch up as i just cant get my head around inventor or freecad. I am using a plug in called curviloft i think its called to create some of the surfaces just like the area you pointed out :(
If you save the files as 3dm I could take a look to the original geometry.

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

Post by rjsa » Fri Sep 13, 2019 12:07 pm

etsmc wrote:
Fri Sep 13, 2019 10:51 am
Unfortunately I am still using sketch up as i just cant get my head around inventor or freecad. I am using a plug in called curviloft i think its called to create some of the surfaces just like the area you pointed out :(
Consider Fusion360. It has tools similar to polygon sculpting. And a free hobby version. Andre stopped complaining about my meshes.