[Gmsh] Mapped meshing
Christophe Geuzaine
cgeuzaine at ulg.ac.be
Wed Apr 23 10:26:33 CEST 2008
Atanas Pavlov wrote:
> Yes, I had not understand the concept of Transfinite grids, it is
> exactly what I need. Thank you very much.
> I have a few other questions, if someone happens to have an answer to
> them :)
>
> 1) I have not been able to find an Offset command in Gmsh (generate
> curve which is offset from another curve by a given distance). Any
> suggestions?
>
> 2) I am considering integrating Gmsh in a simple application, which
> generates a certain geometrical configuration and meshes it. I have not
> been able to find any example how to do that, my attempts to compile
> anything against libGmsh.a (generated by make install-lib) have been
> fruitless ( I cannot check the archive content with nm either, it seems
> to be archive made of other archives and I do not know how to compile
> against it). When I try to compile anything also against the full set of
> libraries created in the lib build directory, I get a lot of error
> messages about unresolved references. Is there any example anywhere,
> which shows how to use Gmsh API to create and mesh geometries?
cf. utils/misc/driver.cpp in the source distribution
>
> Thanks a lot,
> Atanas
>
> 2008/4/21 Christophe Geuzaine <cgeuzaine at ulg.ac.be
> <mailto:cgeuzaine at ulg.ac.be>>:
>
> Atanas Pavlov wrote:
>
> Hello,
>
> I am trying to create a mesh for an axisymmetric geometry, which
> is relatively simple, defined by a few points, resp curves
> connecting them. I would like, however, to perform mapped
> meshing where I partition the curves, then use these partitions
> on 4-side surface regions to partition the regions, and then
> revolve-extrude the mesh around the symmetry axis. As far as I
> can see, the first step is currently not possible in GMSH,
> because for surface mesh it can only generate triangle mesh (or
> extrude 1D mesh, which however is not possible in this case). Is
> there any workaround? Is mapped meshing planned to be
> implemented in GMSH, and for simple cases like that, can it be a
> short term feasible task?
>
>
> Could you use a Transfinite grid like this?
>
> Point(1) = {0,0,0,0.1};
> Point(2) = {1,0,0,0.1};
> Point(3) = {0,1,0,0.1};
> Point(4) = {3,0,0,0.1};
> Point(5) = {3,3,0,0.1};
> Point(6) = {0,3,0,0.1};
> Line(1) = {3,6};
> Line(2) = {6,5};
> Line(3) = {5,4};
> Line(4) = {4,2};
> Circle(5) = {2,1,3};
> Line Loop(6) = {3,4,5,1,2};
> Plane Surface(7) = {6};
> Transfinite Line {1} = 20 Using Progression 1.2;
> Transfinite Line {4} = 20 Using Progression 1./1.2;
> Transfinite Line {3,2} = 10 Using Progression 1;
> Transfinite Line {5} = 19 Using Progression 1;
> Transfinite Surface {7} = {3,6,4,2} Alternated;
> Recombine Surface {7};
>
>
>
> Cheers,
> Atanas
>
>
>
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>
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
> <http://www.montefiore.ulg.ac.be/%7Egeuzaine>
>
>
>
>
> --
> Atanas Pavlov
> Luitfriedstr. 18, München 80995
--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine