[Gmsh] Gmsh how to extract the node ID's on a given 3D Mesh Boundary Surface

[Zuheyr Alsalihi]

Dear Prof. Geuzaine,

Mille grand merci.

The question is I only need the nodes on the on the tagged Physical Surface
surface.

For instance: in the msh abaqus.inp with "Save groups of nodes" option:
my tagged surface is:

*ELSET,ELSET=PeriodicSurfacePS
589727, ......

where

******* E L E M E N T S *************
*ELEMENT, type=CPS6, ELSET=Surface7
589727, 1150, 13, 18137, 1170, 18413, 18414

are then the nodes of the SURFACE ELEMENT 589727

but what I am missing then is :
this surface element is not one of the faces of a 3D tetrahedra element as
I cannot find an element 589727 in the Volume :
*ELEMENT, type=C3D10, ELSET=Volume1

If I use the nodes from the line: 1150, 13, 18137, 1170, 18413, 18414 for
the surface element 589727, I am set?

Many thanks and best regards,
Zuheyr
--------
Dr. Zuheyr Alsalihi
Senior Research Engineer
Turbomachinery and Propulsion Department von Karman Institute for
Fluid Dynamics Ch. de Waterloo, 72, Rhode-St-Genese
Belgium Direct Line: +32 (0)2 359 98 65
Fax: +32 (0)2 359 96 00
E-mail: alsalihi at vki.ac.be
http://www.vki.ac.be


On Mon, Jun 18, 2018 at 10:26 AM Christophe Geuzaine <cgeuzaine at uliege.be>
wrote:

>
>
> On 17 Jun 2018, at 11:12, Zuheyr Alsalihi <zuheyr at gmail.com> wrote:
>
>
> Hello,
> Is there a way to get the node ID's of  the elements that lie on a
> boundary surface in a 3d solid mesh where I mark the
> surface by creating a physical surface.
>
>
> Load the mesh and retrieve the elements tagged with the physical group;
> then loop over the elements and get the nodes.
>
> (The gmsh::model::mesh::getNodesForPhysicalGroup function in the Gmsh API
> does just that.)
>
>
>
>
> Thank you for reading!
>
> Best,
> --
> Zuheyr Alsalihi
> _______________________________________________
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>
>
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
>
>

-- 
Zuheyr Alsalihi
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