Irregular Tri Mesh: Impact & Repair?

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Discussion Overview

The discussion centers on the implications of using an irregular triangular mesh created in Marc MSC for a solid model, specifically regarding its impact on analysis results and potential repair methods. Participants explore the effectiveness of the meshing routine and the characteristics of the generated mesh.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether the irregularity of the mesh will affect the analysis results and inquires about possible repair methods.
  • Another participant notes that while the bulk of the mesh appears fine, there are concerns about skinny, dart-like triangles that could lead to inaccuracies.
  • A participant clarifies that the mesh was created using the Automesh option for volumes in Marc MSC and seeks validation on this approach.
  • It is suggested that as long as adjacent elements are of similar size and there are no large angles at corners, the irregular mesh may not pose significant problems.
  • One participant argues that an irregular mesh can sometimes be more advantageous than a regular mesh, particularly if it avoids large angles.
  • Another participant acknowledges the model as a 3D cylinder, confirming the nature of the mesh discussed.

Areas of Agreement / Disagreement

Participants express varying opinions on the implications of the irregular mesh, with some suggesting it may not be problematic while others raise concerns about specific features of the mesh. No consensus is reached regarding the overall impact on analysis results.

Contextual Notes

There are uncertainties regarding the specific criteria that define an acceptable mesh for accurate analysis, as well as the potential effects of the identified irregularities.

Who May Find This Useful

Individuals working with finite element analysis, particularly those using Marc MSC for meshing and modeling, may find this discussion relevant.

graba
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As in the subject. I have created tri mesh on my solid and it is completely irregular. Does it have any impact on later results of the analysis? Can it be repaired somehow? I attached a picture in case you would like to see it. I am working with Marc MSC
 

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Did you personally create this mesh, or did a meshing routine from Marc MSC create it?

The bulk of the meshing appears to be fine. However, on the right hand side of the image, where the size of the triangles gets noticeably smaller, it's really hard to tell, but it looks like a bunch of skinny, dart-like triangles. This might give relatively inaccurate results.
 
I created it by a meshing routine from Marc. I used Automesh option for a case of Volumes.
I was trying to transform STL model to solid and I managed to create the mesh inside the model.
Do you think that meshing with use of Automesh -> volumes was a good way to achieve this?
 
SteamKing said:
The bulk of the meshing appears to be fine. However, on the right hand side of the image, where the size of the triangles gets noticeably smaller, it's really hard to tell, but it looks like a bunch of skinny, dart-like triangles.

It looks like the surface of a 3D mesh on a cylinder to me. The "small" triangles are part of the curved surface.

So long as adjacent elements are about the same size as each other, and there are no elements with large angles (90 degrees or bigger) at a corner, there shouldn't be any problems. In fact an "irregular" mesh can be better than a "regular" mesh like squares or cubes divided up into triangles, because in that type of mesh there are many triangles with a 90 degree angles.

FWIW very small angles (like 1 degree) can look strange, but they are harmless compared with large angles.
 
Thank you guys for help. I will inform you if I perform some analysis with this model.
And yes AlephZero, you were right, that is a model of 3D cylinder.
 

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