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

[Christophe Geuzaine]

> 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