[Gmsh] 2D structured mesh in gmsh

[Christophe Geuzaine]

Hi - structured meshes require a simple topology. Take a look e.g. at tutorial/t6.geo, which shows how to definite transfinite interpolation on a surface by specifying the 4 "logical" corners in the interpolation.

Christophe


On 15 Jan 2013, at 22:59, Maciej Piechotka <uzytkownik2 at gmail.com> wrote:

> Hi,
> 
> Sorry for asking probably very basic question, but despite trying, reading
> several tutorials etc. I have problems with created 2D structured mesh (probably
> because I have no idea what actually extrude does).
> 
> I simply need to include graphics comparing unstructured and structured mesh in
> report (later in thesis). I created a simple mesh:
> 
> Point(1) = {0, 0, 0, 1.0};
> Point(2) = {0, 1, 0, 1.0};
> Point(3) = {1, 1, 0, 1.0};
> Point(4) = {1, 0, 0, 1.0};
> Point(5) = {0.5, 0.5, 0, 1.0};
> Point(6) = {0.75, 0.5, 0, 1.0};
> Point(7) = {0.25, 0.5, 0, 1.0};
> Circle(1) = {7, 5, 6};
> Circle(2) = {6, 5, 7};
> Line(3) = {1, 2};
> Line(4) = {2, 3};
> Line(5) = {3, 4};
> Line(6) = {4, 1};
> Line Loop(7) = {3, 4, 5, 6};
> Line Loop(8) = {2, 1};
> Plane Surface(9) = {7, 8};
> 
> Creating unstructured mesh in gmsh was trivial - however when I tried to
> followed demos/hex.geo example suddenly the mesh started behave
> strangely (for example suddenly parts move outside volume [from what
> I understend I need to partition 3D]). How can I mesh the above surface?
> 
> Thank you very much for help (the only people using gmsh I have access to work
> on unstructured meshes and I need to create mesh just for my report). 
> 
> Best regards
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine