[Gmsh] how to mesh rods
Christophe Geuzaine
cgeuzaine at ulg.ac.be
Sun May 31 10:01:55 CEST 2009
jean pierre aubry wrote:
>
>
> hello
>
>
> i have to model a structure made of beams and sustaining rods or cables,
>
> think of a suspension brigdge
>
> rods have no flexural rigidity and must be modelled as a single element
> along their length
>
> otherwise the matrix will be singular
>
>
> here is a small example model, 4 nodes and 3 lines
>
>
> P1 P2
>
> +--------------------L1--------------------+
>
> |
>
> |
>
> L3
>
> |
>
> ||
>
> +--------------------L2--------------------+
>
> P3 P4
>
>
> i want Line L1 and L2 to be meshed as beams with (ideally) equally
> spaced nodes along them
>
> but
>
> i want Line L3 to be meshed as a ROD i e one single finite element along
> its length -NO INTERMEDIATE NODES-
>
> how to apply « Charcateristic Length » at the Points to do that
>
> or any other clever way to it
>
Hi Jean-Pierre - Use a structured mesh on the rods:
Transfinite Line{1,2} = 13; // 13 points on lines 1 and 2
Transfinite Line{3} = 2; // 2 points on line 3
>
> I mean more clever than altering *.msh file by hand the saving it as
> *.med or *.unv and repeating that process every time a change is made
>
>
> anybody has a good idea
>
>
> thanks
>
>
> jean pierre
>
>
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>
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine