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[xjannekje]

Hello,

I have a question about applying boundary conditions inside a geometry.
What I have now is a tetrahedral mesh with 10 markers (spheres) inside. I created this by importing the stl files of the surface mesh and
the markers in SpaceClaim and merged them to have a shared topology. The internal markers are about 1000 times stiffer than the rest.

I know the deformation of half of the markers (the ones without a red cross), and want to know the deformation of the other ones (with the red cross) by performing an analysis.
I also know the deformation of the surface of the mesh.

However; when I run the analysis, the internal markers with known deformation field deform correctly, but the surrounding elements get stretched. I want the surrounding elements to translate with the translated markers and not get stretched. I visualized a section plane where the markers indicated with the red arrow are the ones with known displacement field and the green ones without known displacement field. As you can see the elements around the markers with a red arrow are stretched too much and not translated with the markers. Does anyone know what I can do about this? I already played with the material stiffness but it didn't matter a lot.