[Gmsh] gmsh 4.5.6: Creating a mesh from .vtk files - Surface is not remeshing but only the Volume

[Lisa Pankewitz]

Hi Christophe,

 Thanks for the clarification, I misunderstood.

Could you maybe point me to a tutorial or an example that elaborates a bit
more on how I would now tag the surfaces manually based on the vtk
providing the boundaries?
 I assume you tagged the surfaces and volume afterwards in order to create
the nice figure you sent?

Thanks!


Kind regards,

Lisa

----------------------------------------------------------------------------------------------------------------------
*Lisa Pankewitz*
PhD student
Simula Research Laboratory
Martin Linges vei 25
1364 Fornebu
Office 329
lisa at simula.no



On Tue, 23 Jun 2020 at 08:30, Christophe Geuzaine <cgeuzaine at uliege.be>
wrote:

>
>
> > On 22 Jun 2020, at 19:14, Lisa Pankewitz <lisa at simula.no> wrote:
> >
> > Dear Christophe,
> >
> > thanks so much for your helpful and fast response. It is really
> appreciated!
> >
> > Just to double check: Does that mean that the assignment of surface
> names with the syntax I used before does not work any longer in gmsh ?
> >
>
> It does of course. But when new surfaces are created (by ClassifySurfaces)
> you'll need to identify them as well.
>
> > Thanks so much and have a great day :)
> > Kind regards,
> >
> > Lisa
> >
> >
> ----------------------------------------------------------------------------------------------------------------------
> > Lisa Pankewitz
> > PhD student
> > Simula Research Laboratory
> > Martin Linges vei 25
> > 1364 Fornebu
> > Office 329
> > lisa at simula.no
> >
> >
> >
> > On Mon, 22 Jun 2020 at 18:10, Christophe Geuzaine <cgeuzaine at uliege.be>
> wrote:
> > Hi Lisa,
> >
> > Your script seems quite complicated. Here's a simple one that produces a
> decent mesh:
> >
> > Merge "File_1.vtk";
> > Merge "File_2.vtk";
> > Merge "File_3.vtk";
> > Merge "File_4.vtk";
> > Merge "File_5.vtk";
> > Merge "File_6.vtk";
> > Merge "File_7.vtk";
> >
> > Coherence Mesh; // remove duplicate mesh nodes
> >
> > ClassifySurfaces{21 * Pi/180, 1, 0 /* or 1 */, 40 * Pi / 180};
> > CreateGeometry;
> >
> > Mesh.CharacteristicLengthMax = 10;
> > Mesh.CharacteristicLengthMin = 0.1;
> > Mesh.CharacteristicLengthFromCurvature = 1;
> > Mesh.MinimumElementsPerTwoPi = 20;
> >
> > s() = Surface{:};
> > Surface Loop(1) = s();
> > Volume(1) = 1;
> >
> > We still need to add some tools to automate the identification of
> curves/surfaces created by ClassifySurfaces. For now you'll need to tag
> them manually (or use some geometrical tests, e.g. using the Gmsh API).
> >
> > Christophe
> >
> > <ok.png>
> >
> >
> >
> >> On 22 Jun 2020, at 17:25, Lisa Pankewitz <lisa at simula.no> wrote:
> >>
> >> To whom it may concern,
> >>
> >> I am trying to remesh a geometry based on .vtk files.
> >> I merge 7 .vtk files. 4 vtk files are used to create a surface that
> consists of 4 compounds. All 7 surfaces together define the volume. I
> assign tags (names) to the physical surfaces, which I need in later steps.
> Unfortunately, I realized the surface does not remesh. I checked several
> tutorials and parameters but could not yet find a possibility to keep the
> tags and remesh the surface and the volume in the assigned characteristic
> length in gmsh version 4.
> >> I tried
> >> '''
> >> RefineMesh
> >> '''
> >> but this only splits the elements instead of performing an optimal
> refinement.
> >>
> >> Do you by chance know what I could assign in order to remesh the
> surface AND the volume and not only the volume?
> >>
> >> Thanks so much for your time and have a wonderful day!
> >> Kind regards,
> >>
> >> Lisa
> >>
> >>
> ----------------------------------------------------------------------------------------------------------------------
> >> Lisa Pankewitz
> >> PhD student
> >> Simula Research Laboratory
> >> Martin Linges vei 25
> >> 1364 Fornebu
> >> Office 327
> >> lisa at simula.no
> >>
> >>
> <File_4.vtk><File_3.vtk><File_2.vtk><complex.geo><File_1.vtk><File_5.vtk><File_6.vtk><File_7.vtk>_______________________________________________
> >> gmsh mailing list
> >> gmsh at onelab.info
> >> http://onelab.info/mailman/listinfo/gmsh
> >
> > —
> > Prof. Christophe Geuzaine
> > University of Liege, Electrical Engineering and Computer Science
> > http://www.montefiore.ulg.ac.be/~geuzaine
> >
> >
> >
> > _______________________________________________
> > gmsh mailing list
> > gmsh at onelab.info
> > http://onelab.info/mailman/listinfo/gmsh
>
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
>
>
>
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