[Gmsh] Quadrangular mesh with flat faces from ruled surface

Julien ERCOLANELLI julien.ercolanelli at ensta-bretagne.org
Fri Jul 8 11:05:40 CEST 2016

Hi Felix,

Yes a ruled surface that is not flat.

I did what you explained. Recombine + 1 st order

But Gmsh gives non-flat quadrangular mesh elements since the four points of an element are not in a same plane. All the elements are composed of two triangles with different normals (see attached file).

Is Gmsh is able to do what I want?

or Do I need a trick to get quadrangular mesh with flat faces? I though transform my ruled curved surfaces into multiple plane surfaces approximating my real geometry but it might not be so simple.

De : Felix Salazar <felix.a.salazar at gmail.com>
Envoyé : jeudi 7 juillet 2016 20:13:38
Cc : gmsh at onelab.info
Objet : Re: [Gmsh] Quadrangular mesh with flat faces from ruled surface

You mean a ruled surface that isn't flat itself?

Recombine the mesh for that surface to get the quads. And pay attention to specify 1st order elements in the mesh options. If you want structured quads, check the documentation and the tutorials to get the transfinite lines and surfaces.

You should get a non-planar surface with flat first order elements.

Hope this helps

On Jul 7, 2016 7:32 AM, "Julien ERCOLANELLI" <julien.ercolanelli at ensta-bretagne.org<mailto:julien.ercolanelli at ensta-bretagne.org>> wrote:

Dear Gmsh users,

I am working with ruled surfaces and at the end I would like to get a quadrangular mesh with only flat faces.

Is there a way to mesh a ruled surface with flat quadrangular faces?



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