[Gmsh] Forcing nodes along an interior boundary

[Christophe Geuzaine]

On 27 Jun 2013, at 19:25, Vishal Ganpat <vishalgnpt at gmail.com> wrote:

> Hello, 
> I am very new to gmsh. I am trying to mesh a cuboid. However, on the top face of the cuboid, I need a circle along which nodes need to be enforced. (This is the line along which my forces act for my problem). To this end, I begin with a 2D mesh and extrude it. I created 2 line loops, one for the outer boundary (a rectangle) and one for the circle. I created 2 plane surfaces using these line loops and extruded them along z-direction. (I am not sure if this is the best way to do). 
> 
> Now I want to use my own FE code on this mesh exported in Abaqus inp format, however it exports lot of other data like 1D, 2D elements in the file even though I created a Physical Volume. Also, I would like to renumber the nodes and elements and export only the 3D mesh. Since my FE code is not so sophisticated to pre-process the input file, I was wondering if this could be done in gmsh. 
> 
> 
> 1) Forcing nodes along a boundary

Have a look at the new tutorial/t15.geo in Gmsh 2.8

> 2) Renumbering the nodes and elements

This is not supported yet for all mesh output formats. It's planned for a future release.

> 3) Exporting only the required data
> 

This should work; exporting your file in Abaqus format with Gmsh 2.8 I only get the volume elements.


> 
> I am attaching the geo file and a screenshot of the mesh. 
> 
> 
> Any help/tips are appreciated. 
> 
> thanks
> regards
> Vishal 
> <3DExtrude.geo><ScreenShot.png>_______________________________________________
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine