meshing problem with different mesh size?

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ShawHale
Posts: 1
Joined: Thu Mar 04, 2021 3:17 pm

meshing problem with different mesh size?

Post by ShawHale »

Hi,

Recently I imported a complicated 3D model from other 3D-design software with extension .SLDASM (SolidWorks Assembly File) into GID, and tried to make its surface conformal and mesh it (I only need surface mesh). I think I already made it conformal for that when I check View -> Higher entities -> lines all lines are interior lines. The problem is with one component surface of this model, so I extract this component surface and save it in a single Gid file. I can mesh it successfully with setting mesh size 0.4 or larger than this value, but errors will be reported if I try to mesh it with setting mesh size smaller than 0.3. The error is : Couldn't mesh the surface. I don't know why this happens, I upload the file in .rar format, please check it and help to fix it.

Thank you very much!
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escolano
Posts: 1915
Joined: Sun Sep 05, 1982 10:51 pm

Re: meshing problem with different mesh size?

Post by escolano »

The related .rar file is not attached. Try again
(Maybe this forum allow only .zip attachments)

Probably your model has big gaps or self-intersections, and meshing with small size cannot 'jump' some defect.
Bil
Posts: 15
Joined: Sun Jan 27, 2019 7:18 pm

Re: meshing problem with different mesh size?

Post by Bil »

Hi,

i have an other problem with different mesh size.

I try to create a quadrilateral mesh for a fill section on a foundation with different size (small size at the middle, under the fill and big size outside of the fill).

I can't find the correct way to have a good quadrilateral meshing. I don't know if the best way to do that is to create many section element?

this picture to show what i'm looking for
what i'm looking for
what i'm looking for
5.PNG (68.24 KiB) Viewed 3981 times
and this picture to show the different section element i created to try to have the meshing presented before
what i'm looking for
what i'm looking for
5.PNG (68.24 KiB) Viewed 3981 times
thanks
Attachments
5b.PNG
5b.PNG (15.17 KiB) Viewed 3981 times
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escolano
Posts: 1915
Joined: Sun Sep 05, 1982 10:51 pm

Re: meshing problem with different mesh size?

Post by escolano »

Creating several surface do you have more control of the final mesh.

In your example, you can do a structured mesh of quadrilaterals, because all surfaces are 4-sided (a topological square)
Mesh->Structured->Surfaces->Assign number of divisions to surface lines

and you must set amount of divisions on each one of the two directions

You can also force the concentration of elements near the start or end of the lines with
Mesh->Structured->Lines->Concentrate elements
Select the lines (know the advancing direction is crucial) and set weights to the start or end. A positive weight attract the elements, a negative value repulse the elements (but the amount of elements is fixed in this case by your structured surface divisions).
e.g. negative weights at start and end will concentrate elements in the middle of the line.
Bil
Posts: 15
Joined: Sun Jan 27, 2019 7:18 pm

Re: meshing problem with different mesh size?

Post by Bil »

Hi, thanks for this answer.
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