FEM mesh size when a finite conductivity is introduced

lostarmour
lostarmour Altair Community Member
edited October 2020 in Community Q&A

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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Answers

  • Mel
    Mel Altair Community Member
    edited October 2019

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

  • lostarmour
    lostarmour Altair Community Member
    edited October 2019
    Altair Forum User 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? 

  • Mel
    Mel Altair Community Member
    edited October 2019

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

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