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probelm with automesh on *.stl file

Hello,
I have a poblem when meshing a *.stl file with the automesh function at HyperMesh 12.0.
As seen in the pictures below the automesh adds some trias in a wave shape to certain edges, which are not in the *.stl file. It seems like there is a problem meshing some 90° angles.

Here you can find the .hm file with the fnished automesh:

https://gigamove.rz.rwth-aachen.de/d/id/RmUWQLgaAv7exR

It would be nice when someone has some idea/solution how to solve the problem.
Since I am new to Hypermesh a detailed description would be very helpful.

Tim

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Rahul_P1

here 2 more pictures of the *.stl and the mesh

Rahul_P1

Hi Tim,

The problem is probably because STL is already a tria mesh, usually of very low quality elements to capture the features of a geometry.

I would need your STL file to help you with the settings you need for automesh,

For a quick solution however, you can create surface geometry from the stl using geom > surfaces > from FE, and then automesh the surfaces.

Rahul_P1

Hi Rahul

Thanks for your fast response.
Here you can find the STL file

Rahul_P1

Tim,

It is sometimes not possible to capture an stl geometry accurately by meshing, it is best to go to the source of the geometry and export in geometry formats.

I tried 2d > shrinkwrap with very good results, see image below, you can also perhaps try the loose wrap option to see if that geometry is acceptable for you.
Remember to create a new component and make it current before you start the shrink wrap option,

you can then after a shrinkwrap mesh the elements with trias etc as well.