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Hexahedral mesh construct fails

Posted by Bhattarai at April 01. 2019

Dear Salome Users and experts,

I needed to generate a hexahedral mesh out of a solid geometry for which tetrahedron (netgen) is successful. However, selecting the following options hexahedral mesh generation fails:

Mesh type: Hexahedral

3D option: Hexahedron (i,j,k)

2D option: Quadrangle (Mapping)

1D option: Wire discretization with specified local length (for example 1)

 

Piles of error occurs in different part of geometry:

1) Unexpected geometry. Face must have 4 sides but not 3

2) Inverted elements generated

 

Can anyone please have a look into the file provided in the following link:

 

http://www.filedropper.com/solidanococcygeal

 

Many thanks in advance.

 

Best regards,

Bhattarai

Re: Hexahedral mesh construct fails

Posted by Saint Michael at April 01. 2019

Hi Bhattarai

Such geometry is not suitable for mapped hexa meshing available in SALOME which requires geometry to be a compound of blocks.

St.Michael

Re: Hexahedral mesh construct fails

Posted by Bhattarai at April 01. 2019

Thank you St. Michael for your prompt reply. If I understood correctly then for my ready made geometry (constructed using other CAD software, for example Rhino3D), there is no straight forward way to construct a hexahedral mesh. For this, one has to follow a step wise procedure of creating edges, faces, shells and solids in Salome itself, is it true?

Bhattarai

Re: Hexahedral mesh construct fails

Posted by Saint Michael at April 01. 2019

Sometimes it is possible to just divide an imported geometry into blocks using Partition operation. But in your case it is very difficult if ever possible.

St.Michael

Re: Hexahedral mesh construct fails

Posted by Bhattarai at April 02. 2019

Thank you again.

 

Bhattarai

Re: Hexahedral mesh construct fails

Posted by Christophe Bourcier at April 02. 2019

Hi,

You can also try the Body Fitting algorithm with a fine step to get regular hexahedra on a complex shape (and some polyhedra near the boundary, depending on the threshold).

Christophe

Re: Hexahedral mesh construct fails

Posted by Sergio Pluchinsky at April 04. 2019
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