# FEM mesh size when a finite conductivity is introduced

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Hello everyone,

I have a small doubt regarding the mesh size of the FEM solver when the material inside a 3D body (for RCS consideration) is characterized with some finite conductivity. I can see the standard mesh default for FEM is around \lambda/10 but with a conductivity of 10 inside a material (\epislon_r = 1), the mesh size for standard meshing is around \lambda/145. Does it change when the skin depth changes? I have attached my cfx here.

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Feko will mesh the FEM tets according to the wavelength inside the medium, so definitely defining a conductivity will reduce the mesh size.

lostarmour likes this

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Just now, mel said:

Feko will mesh the FEM tets according to the wavelength inside the medium, so definitely defining a conductivity will reduce the mesh size.

Thanks for the insight.

Does it have a rule for the standard mesh? Like how much it is going to reduce based on wavelength inside the medium and conductivity?

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Yes, see "Automatic Meshing for Regions" in the Altair_Feko_User_Guide.pdf

lostarmour likes this

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