[MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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CAEdevice
39
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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MaccaRacing wrote:
Mon Jun 29, 2020 4:44 pm
Seems like CAEdevice has the diffuser strakes detached by the main diffuser... Am I wrong?
Oops, you are right

MaccaRacing
MaccaRacing
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Joined: Fri May 08, 2020 8:22 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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CAEdevice wrote:
Mon Jun 29, 2020 5:28 pm
MaccaRacing wrote:
Mon Jun 29, 2020 4:44 pm
Seems like CAEdevice has the diffuser strakes detached by the main diffuser... Am I wrong?
Oops, you are right
You made it on purpose or by error...? 🤔🤔🤔

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CAEdevice
39
Joined: Thu Jan 09, 2014 2:33 pm
Location: Erba, Italy

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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MaccaRacing wrote:
Mon Jun 29, 2020 5:29 pm
CAEdevice wrote:
Mon Jun 29, 2020 5:28 pm
MaccaRacing wrote:
Mon Jun 29, 2020 4:44 pm
Seems like CAEdevice has the diffuser strakes detached by the main diffuser... Am I wrong?
Oops, you are right
You made it on purpose or by error...? 🤔🤔🤔
It is absolutely my mistake

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machin
185
Joined: Tue Nov 25, 2008 1:45 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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MaccaRacing wrote:
Mon Jun 29, 2020 4:44 pm
Seems like CAEdevice has the diffuser strakes detached by the main diffuser... Am I wrong?
....Well spotted.... :shock:
COMPETITION CAR ENGINEERING -Home of VIRTUAL STOPWATCH

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Koldskaal
10
Joined: Tue May 14, 2019 9:02 am
Location: Denmark

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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I recently rediscovered the Honda R&D 2009 technical review in a folder on my desktop. They use what is called quiver plots in matlab terminology. I dont know what else to call them, as both vector plot and vector field seem like bad names to me. I think these could be at least as powerful as LIC, so I tried recreating one in paraview:
Image
It is a lot easier to read the rotational direction of the vorticies, which could make it easier to understand how they interact.
The geometry outline is just a slice of all the patches. The quiver plot itself is made by extracting the internal mesh applying a calculator to remove the x component of the velocity (not strictly necessary ). Then slicing using 3d glyphs as representation, orienting after the result of the calculator (direction mode), and scaling by 0.02.
It's pretty good but not perfect. Do any of you know of a way to get uniform spacing in paraview?
Maybe this would be easier to implement in mflow than LIC? :wink:
MVRC - Team Koldskaal, name: Christian

Thomas2019
Thomas2019
2
Joined: Fri Aug 16, 2019 12:38 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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Koldskaal wrote:
Wed Jul 01, 2020 2:29 pm
Do any of you know of a way to get uniform spacing in paraview?
Uniform mesh. :lol:

What I have done in the past iirc is to generate a plane source with the subdivisions I want for the vectors and interpolate the U field onto that plane.
Quite cumbersome.

Thomas

MaccaRacing
MaccaRacing
0
Joined: Fri May 08, 2020 8:22 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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Hi guys! any news about race results?

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LVDH
30
Joined: Tue Mar 31, 2015 1:23 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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Koldskaal wrote:
Wed Jul 01, 2020 2:29 pm
I recently rediscovered the Honda R&D 2009 technical review in a folder on my desktop. They use what is called quiver plots in matlab terminology. I dont know what else to call them, as both vector plot and vector field seem like bad names to me. I think these could be at least as powerful as LIC, so I tried recreating one in paraview:
https://i.imgur.com/xnVAfmV.png
It is a lot easier to read the rotational direction of the vorticies, which could make it easier to understand how they interact.
The geometry outline is just a slice of all the patches. The quiver plot itself is made by extracting the internal mesh applying a calculator to remove the x component of the velocity (not strictly necessary ). Then slicing using 3d glyphs as representation, orienting after the result of the calculator (direction mode), and scaling by 0.02.
It's pretty good but not perfect. Do any of you know of a way to get uniform spacing in paraview?
Maybe this would be easier to implement in mflow than LIC? :wink:
This is the workaround I have been investigating.
BTW: The uniform distribution is not exactly hidden in Paraview. It is called "Uniform Spacial Distribution". On my installation it is even the default choice.

MaccaRacing wrote:
Sat Jul 04, 2020 12:23 pm
Hi guys! any news about race results?
I just came back from a very much needed vacation and am checking the results but it looks very much like you will have to enjoy the real F1 race tomorrow and wait for the MVRC results until next Sunday. I am very sorry.

Thomas2019
Thomas2019
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Joined: Fri Aug 16, 2019 12:38 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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LVDH wrote:
Sat Jul 04, 2020 2:08 pm
This is the workaround I have been investigating.
BTW: The uniform distribution is not exactly hidden in Paraview. It is called "Uniform Spacial Distribution". On my installation it is even the default choice.
Sure, but it is still random and driven by the seed value, afaik.

Here is the "Every nth point" with value 10. Not good for locally refined meshes, as it puts too many vectors near the walls.
Image

Here is the Paraview "Uniform Spatial" with some Seed number. Still a random distribution. Unless there is a trick I have not learned yet, its not really what I want.
Image

Here is the plane - workaround. Independent of the mesh refinement.
Image

I will post the work around in the next post.

Thomas

Thomas2019
Thomas2019
2
Joined: Fri Aug 16, 2019 12:38 pm

Re: [MVRC] Mantium Virtual Racecar Challenge 2020 (Grand Prix Cars)

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Here the Paraview pipeline for generating the uniformly distributed vectors.
Load your foam file.

Goto Sources > Plane
and generate a plane of the desired dimensions and locations. 2m x 2m at the (0 0 0) point in this case.
Use "X Resolution" and "Y Resolution" to control the number of vectors to be plotted later. Using the same number here makes sense.
Image

Now we map the results onto this plane.
Filters > Resample with Dataset
In the dialog pop up, select "Input" and click on your foam data.
Then select "Source" and click on the Plane.
Then click "Ok".
Image

This will result in this:
Image

You can now for example apply the calculator as Koldskaal mentioned to get rid of the U_x component in the U vector. Note formula, how "iHat" is multiplied with "0". This is purely done to make the vectors more "visible" in a y-z section, otherwise their length would be entirely ruled by the dominating x-component.
Image

Create your "Glyph" filter on the Calculator, using the "Result" vector as an input and choose "All Points" for masking.
Image

Play around with the X and Y Resolution on the Plane to quickly get a good looking plot.

Thomas