Re: [iso2mesh-users] cgalmesh vs. cgalsurf: definiton of faces (in abaqus)

[Qianqian Fang]

On 04/24/2013 07:21 AM, Martin Vogt wrote:

Hi Qianpian,

It looks like there is a difference between cgalsurf and cgalemesh (vol2mesh) according to the generation of the faces.

I want to create a membrane in abaqus which covers my model created by iso2mesh. Therefore I use the faces. If I use the option cgalmesh, an error is returned: Surface skin_surface has facets that are not oriented properly with respect to each other.
Abaqus defines the orientation according to the numeration of the nodes in faces, if i got it right.

If i use cgalsurf, this error doesn't appear.

Is there a possibility to redefine the orientation of the faces? Do you know whether there are differences in the generation of the faces?

hi Martin

the output face orientation is not guaranteed for either
cgal utilities. To ensure a consistent orientation, you
should call surfreorient() to reorient a surface mesh,
or run meshreorient() to reorient a tetrahedral mesh,
and then use volface() to extract a surface.

let me know if this works for you.

Qianqian

In general I would prefer cgalmesh for meshing.

Thanks in advance.

Martin
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[Martin Vogt]

Hi,

sorry for the late answer. I have to admit that I haven't tried your solution, the matter has resolved itself. Because nodes of faces and elements are the same, I don't have to tie membrane and solid elements in Abaqus together. And so i don't need the orientation (I hope so...).

But thank you! Perhaps I will have similar problems again :-)

Regards
Martin

[Qianqian Fang]

On 05/29/2013 04:20 AM, Martin Vogt wrote:

Hi,

sorry for the late answer. I have to admit that I haven't tried your solution, the matter has resolved itself. Because nodes of faces and elements are the same, I don't have to tie membrane and solid elements in Abaqus together. And so i don't need the orientation (I hope so...).

But thank you! Perhaps I will have similar problems again :-)

great, thanks for letting me know the problem has been solved.

Qianqian