[Gmsh] Possibility of rectilinear mesh?

[Christophe Geuzaine]

On 05 Oct 2014, at 13:52, Sefer Bora Lisesivdin <sblisesivdin at gmail.com> wrote:

> Dear all,
> 
> We are studying band structures of semiconductor heterostructures and our software is using gmsh meshes as its geometric information input.
> 
> For 1D and complex 3D structures, gmsh meshes work well. But for 2D studies we need uniform meshes. Our 2-dimensional studies include thin film structures which have few nm layers with smooth interfaces between the layers.
> 
> We tried quadrilateral meshes with symmetrical points to make more uniform. However, with a small difference in the mesh, we obtained very different results.
> 
> If you simply google "HEMT mesh" for images, you can see some mesh images of transistors with uniform triangular or quadrilateral meshes for other simulators.
> 
> What I looking for is the "rectilinear" grid. Is it possible to make 2D rectilinear grid with GMSH?

Yes: you can use "Transfinite" mesh constraints for this and/or create your geometries with "Extrude" and specify regular grids with the "Layers" command. See tutorial/t6.geo and tutorial/t3.geo for simple examples.


> If not, at least may you please suggest some possible programs that can export in GMSH .msh filetype?
> 
> Best regards,
> 
> Assoc. Prof. Dr. Sefer Bora Lisesivdin,
> Gazi University, Department of Physics,
> Nanoscale Devices and Carrier Transport Group,
> http://sblisesivdin.ndct.org/
> Ankara, TURKEY.
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine