[Gmsh] Fw: space frame models and physical

[jean pierre aubry]

----- Original Message -----
From: "jean pierre aubry" <jeanpierre at lamachine.fr>
To: "Christophe Geuzaine" <cgeuzaine at ulg.ac.be>
Sent: Friday, March 13, 2009 11:12 AM
Subject: Re: [Gmsh] space frame models and physical


> Hello
>
> Many thanks for your quick answer, later in the week end i will send a
> proper example.
>
> The main goal is to avoid to have two or more finite elements (with
varying
> mechanical properties) belonging to different Physicals
> being built onto the same mesh line element, this happens with Aster
>
> I have a very large (several meters long) model made of steel sections, in
> the midlle of which i have a few bolted joints with
> elments a few mm long.
>
> I select all the elements to make a Physical named "tube 40x30"
>
> Then i do several zooms to select the small elements and create some new
> Pysicals named "bolt n°xx"
>
> The goal is:
>
> To merge these "bolt n°xx" into a single one named "all bolts"
>
> This can be done in the present state of Gmsh by editing the .geo file
>
> Then to remove all the elements of "all bolts" from "tube 40x30" which
would
> otherwise pollute the calculation
>
> In the present state of Gmsh i call a function within the .geo file but  i
> have to manually create at first an expression list allbolts[] = {.......}
> which contains the same elements as the Physical "all bolts"
>
> All this could be done interactively from within the GUI i guess
>
> I hope this is clear.
>
> A parctical example with the function i use later in the week end
>
> Yours
>
>
> jean pierre
>
> ----- Original Message -----
> From: "Christophe Geuzaine" <cgeuzaine at ulg.ac.be>
> To: "jean pierre aubry" <jeanpierre at lamachine.fr>
> Cc: <gmsh at geuz.org>
> Sent: Thursday, March 12, 2009 9:14 PM
> Subject: Re: [Gmsh] space frame models and physical
>
>
> > jean pierre aubry wrote:
> > > Hello
> > >
> > >
> > > I am doing some modeling of space frame structures with Gmsh, then
> > > processed with Aster, this means playing a bit with physicals.
> > >
> > > I have written some functions to process lists (excluding items
> > > belonging to list “b” that shouldn't be in list ”a”, and so on)
> > >
> > > Before calling these functions I manually replace “Physical Line
> > > (“something”) =” by “a[] =”.
> > >
> > > Isn't it a clever way to equal an expression list to a Physical??
> > >
> >
> > you mean, something like "Physical("something")=aa[];"? (I'm not sure I
> > understand your question.)
> >
> > >
> > > Some built in functions for doing this style of boolean on Physicals
> > > would be a useful add on to Gmsh.
> > >
> >
> > Indeed. That should not be too har to implement. What would be the most
> > useful ones?
> >
> > Christophe
> >
> > >
> > > Which otherwise is very good!!
> > >
> > >
> > > jean pierre
> > >
> > >
> > >
> > > _______________________________________________
> > > gmsh mailing list
> > > gmsh at geuz.org
> > > http://www.geuz.org/mailman/listinfo/gmsh
> >
> >
> > --
> > Prof. Christophe Geuzaine
> > University of Liege, Electrical Engineering and Computer Science
> > http://www.montefiore.ulg.ac.be/~geuzaine
> >
>