# [Gmsh] Unable to create Simple Mesh

Vikram Singh vikramsingh001 at gmail.com
Wed Feb 24 09:25:30 CET 2016

```Yes, indeed. I did a crazy mix up.

Thanks a lot for your help.

On Wed, Feb 24, 2016 at 9:54 AM, Vincent Huber <vincent.huber at cemosis.fr>
wrote:

> Hello Vikram,
>
> I’m afraid your lines are mixed up.
>
> What di you think of the following ?
>
> h=0.1;
> p1 = newp; Point(p1) = {0, 0, 0, h};
> p2 = newp; Point(p2) = {0, 1, 0, h};
> p3 = newp; Point(p3) = {-0.35, 0, 0, h};
> p4 = newp; Point(p4) = {2, 0, 0, h};
> p5 = newp; Point(p5) = {-0.35, 1, 0, h};
> p6 = newp; Point(p6) = {2, 1, 0, h};
> l1 = newl; Line(l1) = {p1, p3};
> l2 = newl; Line(l2) = {p3, p5};
> l3 = newl; Line(l3) = {p5, p2};
> l4 = newl; Line(l4) = {p2, p6};
> l5 = newl; Line(l5) = {p6, p4};
> l6 = newl; Line(l6) = {p4, p1};
>
> ll1 = newll; Line Loop(ll1) = {l1,l2,l3,l4,l5,l6};
> s1 = news; Plane Surface(s1) = {ll1};
>
> Physical Line("front") = {l1,l2,l3};
> Physical Line("bottom") = {l4,l5,l6};
>
> Physical Surface("Omega") = {s1};
>
> ​
>
> 2016-02-23 16:42 GMT+01:00 Vikram Singh <vikramsingh001 at gmail.com>:
>
>> I am unable to create a simple 2D mesh.
>>
>> I need to create a structured mesh for a rectangular domain.
>>
>> I divide the domain into two parts. I want different boundary conditions
>> on the bottom part for the front part and the part behind.
>>
>> Point(1) = {0, 0, 0, 0.1};
>> Point(2) = {0, 1, 0, 0.1};
>> Point(3) = {-0.35, 0, 0, 0.1};
>> Point(4) = {2, 0, 0, 0.1};
>> Point(5) = {-0.35, 1, 0, 0.1};
>> Point(6) = {2, 1, 0, 0.1};
>> Line(3) = {1, 3};
>> Line(4) = {3, 4};
>> Line(5) = {5, 2};
>> Line(6) = {2, 6};
>> Line(7) = {3, 5};
>> Line(9) = {4, 6};
>>
>> Now, GMSH stops making sense after this.  I try to create a plane surface
>> and this is what GMSH does.
>>
>> Line Loop(10) = {4, 9, -6, -5, -7};
>> Plane Surface(11) = {10};
>>
>> As you can see, 3 is not there in the line loop. And the mesh completely
>> ignores Point 1.
>>
>> What is happening?
>>
>> Vikram
>>
>> _______________________________________________
>> gmsh mailing list
>> gmsh at onelab.info
>> http://onelab.info/mailman/listinfo/gmsh
>>
>>
>
>
> --
> Docteur Ingénieur de recherche
> CeMoSiS <http://www.cemosis.fr> - vincent.huber at cemosis.fr
> Tel: +33 (0)3 68 8*5 02 06*
> IRMA - 7, rue René Descartes
> 67 000 Strasbourg
>
>
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