[Gmsh] Closed loop error in simple 2D mesh

[Balemans, C.]

I’m not providing the id of elements to the Line Loop; I define the lines in the 5th column of the Element-part of the msh-file.
Furthermore, when I define 3 elements on each side, the program works perfectly. Unfortunately, when I use only 2 elements, like described below, it gives an error.

Kind regards,
Caroline

From: Vincent Huber [mailto:vincent.huber at cemosis.fr]
Sent: donderdag 4 juni 2015 11:02
To: Balemans, C.
Cc: gmsh at geuz.org
Subject: Re: [Gmsh] Closed loop error in simple 2D mesh


Line Loop asks for elementary Ids, you are providing the id of elements.
Actually, your msh files does not describe elementary lines :-/

the expression-list on the right hand side should contain the identification numbers of all the elementary lines that constitute the line loop.
​

2015-06-01 13:50 GMT+02:00 Balemans, C. <C.Balemans at tue.nl<mailto:C.Balemans at tue.nl>>:
Dear all,

I’m trying to generate a simple 1st-order 2D mesh using the following geo-file:
-------------------------------------------------------
Merge “geometry.msh”;
Line Loop(5) = {1,2,3,4};
Plane Surface(1) = {5};
-------------------------------------------------------

In the msh-file (geometry.msh) the outer lines of the geometry (a square) are given:
-------------------------------------------------------
$MeshFormat
2.2 0 8
$EndMeshFormat
$Nodes
8
1  0.00000000E+00  0.00000000E+00  0.00000000E+00
2  5.00000000E-01  0.00000000E+00  0.00000000E+00
3  1.00000000E+00  0.00000000E+00  0.00000000E+00
4  0.00000000E+00  5.00000000E-01  0.00000000E+00
5  1.00000000E+00  5.00000000E-01  0.00000000E+00
6  0.00000000E+00  1.00000000E+00  0.00000000E+00
7  5.00000000E-01  1.00000000E+00  0.00000000E+00
8  1.00000000E+00  1.00000000E+00  0.00000000E+00
$EndNodes
$Elements
8
1 1 2 0 1 1 2
2 1 2 0 1 2 3
3 1 2 0 2 3 5
4 1 2 0 2 5 8
5 1 2 0 3 8 7
6 1 2 0 3 7 6
7 1 2 0 4 6 4
8 1 2 0 4 4 1
$EndElements
-------------------------------------------------------

When I try to execute the code, the error ‘The 1D mesh seems not to be forming a closed loop’ occurs. Does anybody have an idea what could be the issue?
Thanks in advance!

Kind regards,
Caroline


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