[Gmsh] How to group nodes

Mikhail Titov mlt at gmx.us
Thu Jun 3 18:41:42 CEST 2010

Look for tags in the manual. There are 3 standard tags such as 'elementary
entity', 'physical entity' and 'mesh partition'. I find sufficient for
myself just using physical entities along with the definition of physical
lines in 2D. It effectively groups your elementary entities together.

That is you can define let's say physical line 1 to be made of lines 3 & 4.
Later you'll assign let's say fixed pressure head to line elements (or its
nodes) with physical entity tag of 1.


> -----Original Message-----
> From: gmsh-bounces at ace20.montefiore.ulg.ac.be [mailto:gmsh-
> bounces at ace20.montefiore.ulg.ac.be] On Behalf Of saville at nodai.net
> Sent: Thursday, June 03, 2010 5:50 AM
> To: gmsh at geuz.org
> Subject: [Gmsh] How to group nodes
> Dear gmsh,
> First let me introduce my self, my name is Ramadhona Saville, Tokyo
> University of Agriculture. I just started using gmsh today, and know
> nothing about that.
> I would like to ask how to group some nodes as boundary condition, for
> example I made a simple 2D rectangular mesh (without using z
> coordinate), and I want to make the four sides as boundary condition
> for fluid flow simulation.
> Could you please show me how to do that? And how save that group, so
> that i can use its coordinate as boundary condition for fluid flow?
> I have searched in the tutorial about that, but i just can not find
> about how to do that.
> Thank you
> Yours
> Ramadhona Saville
> International Bio-business Department
> Network Information Lab
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