[Gmsh] Extrusion along a complex guiding path
Christophe Geuzaine
cgeuzaine at ulg.ac.be
Tue Mar 17 00:40:55 CET 2009
Lucas Blattner Martinho wrote:
> Dear Gmsh developers and users,
>
>
>
> I am trying to build the volume of a hanging transmission line
> conductor with Gmsh. The conductor should be a solid cylinder of
> parallel circular faces with its lenght twisted in the shape of a
> catenary.
>
> The approach that I first considered was:
>
> 1) Create evenly spaced points in a direction, each of them with
> appropriate height, so that they describe the catenary's shape.
>
> 2) Build a Spline through these points.
>
> 3) Extrude a circular surface through the path given by the Spline,
> generating the desired volume.
>
>
> However, I have checked Gmsh's documentation and noticed that
> extrusion is only possible through a combination of translations along
> straight lines and rotations around an axis.
>
> Isn´t it possible to extrude a surface using more complex line shapes
> (other than a straight line) as a guiding path?
It's not possible at the moment, but this is indeed something that could
be useful... I'm adding it to our TODO list.
> If not, would an
> alternative way of building this shape exist?
>
You could always define this e.g. in Catia and import the step file?
>
>
> Yours faithfully,
>
> Lucas Blattner Martinho
>
>
> Laboratório de Eletromagnetismo Aplicado - LMAG
> Escola Politécnica da Universidade de São Paulo
> São Paulo, Brasil
>
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>
>
--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine