Re: [Getfem-users] Open mesh

[Yves Renard]

On vendredi 30 avril 2010, GUILMIN Anne-Lise wrote:
> Hello,
>
> Ok then I will go on with my own strategy.
> I still have a problem with the partial mesh fem (used for lagrangian
> multipliers). I update it the same way I do with mesh fem, but this leads
> to a context error in the model. So I am thinking about creating new
> variables for multipliers at each change of mesh. Is there any way to
> destroy a variable of a model? Or just disable it?

Normally, the partial mesh_fem should adapt itself automatically to the new 
situation. Perhaps, you can send me a piece of code exhibiting the problem.

Yves.


>
> Thank you for your help.
> Kind regards,
>
> Anne-Lise Guilmin.
>
> -----Message d'origine-----
> De : Yves Renard [mailto:address@hidden
> Envoyé : jeudi 29 avril 2010 11:14
> À : address@hidden
> Cc : GUILMIN Anne-Lise
> Objet : Re: [Getfem-users] Open mesh
>
>
>
> Daer Anne-Lise,
>
> You are right, there is no specific tool for the moment in Getfem++ to deal
> with such a situation. This is not a trivial task to produce a generic
> algorithm for the automatic re-interpolation (or projection) of a field
> after refinement or change of the mesh. So, for the moment, depending on
> the situation, a specific strategy have to be developped for each
> situation.
>
> Yves.
>
> On mercredi 28 avril 2010, GUILMIN Anne-Lise wrote:
> > Dear all,
> >
> > I am working with an open mesh: I add convexes to the mesh before each
> > new increment.
> > I would like to keep the values of my model variables from one increment
> > to another.
> > As the mesh changes, the numbering of the dof may change too. Is there
> > any predefined function to interpolate the old values on the new
> > mesh_fem?
> > You may have already met this problem when refining meshes.
> >
> > For now, I construct a new mesh_fem, then new vectors of variables from
> > an interpolation of old ones on the new mesh_fem, and finally I
> > overwrite the old meshfem and variables in the model with the new ones.
> > This works well with my main variable but not with lagrangian
> > multipliers:  the computation stops due to an error of context of the
> > model after updating the partial_mesh_fem on which are defined the
> > multipliers.
> > How could I update a partial_mesh_fem and still get a correct context
> > for my model?
> >
> > Thank you for your help.
> >
> > Anne-Lise Guilmin
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-- 

  Yves Renard (address@hidden)       tel : (33) 04.72.43.87.08
  Pole de Mathematiques, INSA-Lyon             fax : (33) 04.72.43.85.29
  20, rue Albert Einstein
  69621 Villeurbanne Cedex, FRANCE
  http://math.univ-lyon1.fr/~renard

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