[Gmsh] How to do nodes reordering in gmsh

[Christophe Geuzaine]

> On 25 May 2015, at 09:55, xiang daopu <xiangdaopu at gmail.com> wrote:
> 
> Hi all gmsh users,
> 
> When I do 1D mesh in gmsh and then refine by splitting, 
> the segment nodes is wrong.

By default Gmsh reorders the nodes and elements (in MSH file format 2). My guess is that you compare the file with the mesh on screen before saving it? Just open the mesh file with Gmsh to check the numbering, and everything should be ok.

> 
> <test.jpg>
> ​Here is the msh file:
> $MeshFormat
> 2.2 0 8
> $EndMeshFormat
> $Nodes
> 5
> 1 0 0 0
> 2 1 0 0
> 3 0.2499999999994083 0 0
> 4 0.4999999999986718 0 0
> 5 0.7499999999993359 0 0
> $EndNodes
> $Elements
> 6
> 1 15 2 0 1 1
> 2 15 2 0 2 2
> 3 1 2 0 1 1 3
> 4 1 2 0 1 3 4
> 5 1 2 0 1 4 5
> 6 1 2 0 1 5 2
> $EndElements
> 
> From the elements section we can see the segment nodes is wrong.
> My question is: how to do nodes reordering in gmsh?
> 
> Thanks in advance!
> Best regards!
> Daopu
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine