[Gmsh] meshing circular inclusions with desired element size

Theler German Guillermo gtheler at cites-gss.com
Thu Jul 23 13:36:05 CEST 2015


Try this solution:

When defining points 5 & 10, given them the same characteristic length h
the border has. And then emebed these points into surfaces 200 and 300
adding these lines after defining surfaces 100, 200 and 300:

Point { 5 } In Surface { 200 };
Point { 10 } In Surface { 300 };

See the attached files.

--
Germán Theler :: CTO Ingeniería & TICs

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On Wed, 2015-07-22 at 15:26 +0930, Nguyen Vinh Phu wrote:
> Dear Johannes,
>
> Your help is very much appreciated. And I managed to do that for one
> single inclusion. When I tried to extend the approach to more than
> one, I failed. Could you please help me how to do that for a simple
> problem with two inclusions of which the geo file is attached so that
> you just modify it. Note that the two inclusions are of different
> radii. And my target is a domain with many many inclusions. So any
> help on how to generalise the procedure is welcome.
>
> Best regards,
> Phu
>
>
> > On 21 Jul 2015, at 5:44 pm, Johannes Wimmer
> <johannes.wimmer at rwth-aachen.de> wrote:
> >
> > Dear Phu,
> > are your inclusions intersecting the domain boundary? If not, simple
> > attractors will do.
> >
> > I have attached a snippet of tutorial 10. It works in 3D
> analogously.
> > Just pay attention that DistMin is not your inner radius of your
> > transition zone from coarse to fine, but the outer one, now. Think
> of it
> > as the radius where the minimal lc applies again. DistMax is then
> your
> > radius up to which the maximal lc (i.e. 5*lc) holds.
> >
> > Cheers,
> > Johannes
> >
> > On 20.07.2015 16:47, Nguyen Vinh Phu wrote:
> >> Dear all,
> >>
> >> I have a square domain with a number of circular inclusions. For
> each
> >> inclusion, I normally define 5 points with the same characteristic
> >> length. This resulted in a mesh where the inclusions are finely
> >> discretised which is not what I need since the inclusions are only
> >> elastic in my FE simulations.
> >>
> >> What I need to achieve is a mesh which is refined around the
> >> inclusion boundaries not within them. I heard and read the
> >> documentation about  background meshes but I really do not know how
> >> to get what I need.
> >>
> >> Any help would be much appreciated.
> >>
> >> Best regards, Phu
> >>
> >>
> >> _______________________________________________ gmsh mailing list
> >> gmsh at geuz.org http://www.geuz.org/mailman/listinfo/gmsh
> >>
> >
> > --
> > Dipl.-Ing. Johannes Wimmer
> > RWTH Aachen
> > Institut für Angewandte Mechanik
> > Mies-van-der-Rohe-Str.1
> > D-52074 Aachen
> >
> > Tel.: +49 (0)241 80 25013
> > Fax : +49 (0)241 80 22001
> > www.ifam.rwth-aachen.de
> >
> <t10_partial_coarseGraining.geo>_______________________________________________
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> > gmsh at geuz.org
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>
>
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