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

[Christophe Geuzaine]

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





> 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



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