[Gmsh] Mapped meshing

[Atanas Pavlov]

Hi David,

That would work only for straight lines. If you offset an arc for example,
you should get a concentric arc with larger radius. In the general case the
translation of each point has to be normal to the curve at that point. So I
do not think this can be done with translation.

Cheers,
Atanas


2008/4/23, David Colignon <David.Colignon at ulg.ac.be>:
>
> Hi,
>
> for question 1, Duplicata and Translate are probably what you need:
>
> http://geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC29
>
> Cheers,
>
> Dave
>
> --
> David Colignon, Ph.D.
> Collaborateur Logistique F.R.S.-FNRS (Equipements de Calcul Intensif)
> ACE - Applied & Computational Electromagnetics
> Institut Montefiore B28
> Université de Liège
> 4000 Liège - BELGIQUE
> Tél: +32 (0)4 366 37 32
> Fax: +32 (0)4 366 29 10
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>
>
>
> 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?
> >
> > 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>
> >    <http://www.montefiore.ulg.ac.be/%7Egeuzaine>
> >
> >
> >
> >
> > --
> > Atanas Pavlov
> > Luitfriedstr. 18, München 80995
> >
> >
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> >
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>


-- 
Atanas Pavlov
Luitfriedstr. 18, München 80995
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