My geometry model can´t be a mesh due to an error

Project Support
1

Hi!

I´m trying to simulate a part of a car but when it transform to mesh it appear an error that´s the following: The meshing failed because the mesh element size is too close to the cad tolerance of the following entities: edge 2225@Flow region. Position: [(-0.115, 9.944e-3, 2.818e-2)]

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Link of the project

Can anybody help me?
Thanks

2

Hi @RAMONNN, thanks for posting! I can’t access your project - did you delete it?

Cheers
Igor

3
4

Hi @RAMONNN,

Inspecting the point where the meshing failed, I have three comments:

  1. You have a sharp corner where edges meet
  2. This will lead to infinitely small cells having to be generated (which of course is not possible), so the mesher will:
    • a. Generate as small cells as possible to capture such a feature
    • b. Distort the cells near its end
  3. You have a small feature suppression of 1e-4, which the mesher is identifying as being to large to even generate a mesh on that spot

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The best solution is to simply remove such a feature from your CAD.

Cheers
Igor

6

Thanks, what small feature supression do you recommend me.

Regards
Ramon

7

Hello Igaviano,

I remove that feature but still appears some error that dosent let me complete the simulations, I investigated in some other projects that have the same part but they made the simulation good, why it dosent let me complete if I already remove it.

Regards

8

Hello!
I was trying to do some fluid simulations but when I upload the geometry it´s appear that the geometry contains faults but when I prepare it in the CAD program it dosen´t appear anything wrong.

Any reccomendations are accepted

Thanks

9

Here´s the link https://www.simscale.com/workbench/?pid=2511153544730636798&geo=1e2278a6-65c3-4906-b8a1-9216001ceb42

10

Hello Igaviano
Could you access to the project and identify something?

11

Hi @RAMONNN, I see that your CAD model contains faults and cannot be used for simulation. When such things happen, you need to go back to your preferred CAD tool and clean your model up so that you get rid of:

  • Small edges
  • Sharp corners
  • Tiny gaps
  • Unecessary details

And at the same time try and prevent such faults from happening by making sure all surfaces are nicely built.

Keep in mind that the mesher will try to fit elements onto every small face in your model - be them relevant for the analysis or not. As an example, the pilot’s helmet is way too complex and full of little faces - just remove them (or the helmet altogether) and move on with the study. You can also approximate the helmet as a simpler shape, such as a sphere or a cylinder.

Cheers
Igor