ERROR 36628: The triangles of a metal surface are not all located in the same medium

Nooshin
Nooshin Altair Community Member
edited February 2022 in Community Q&A

Hi

I have a multilayer antenna and I want to change the metallic parts of the antenna to Copper. According to what I saw in forums, I defined the region medium of the metallic parts to free space and I only defined their faces as copper. However, as I start simulation, I face this error " ERROR   36628: The triangles of a metal surface are not all located in the same medium".

How can I solve this error in my simulation?

Many thanks in advance.

 

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Answers

  • AltairLiz
    AltairLiz
    Altair Employee
    edited February 2022

    Thank you for your question.  Can you tell me which Altair product you are using so that I can move your question to the appropriate forum.

    Thanks,

    Liz Bleicher

    Community Specialist

  • Nooshin
    Nooshin Altair Community Member
    edited February 2022
    Elizabeth Bleicher_21930 said:

    Thank you for your question.  Can you tell me which Altair product you are using so that I can move your question to the appropriate forum.

    Thanks,

    Liz Bleicher

    Community Specialist

    Hi Elizabeth

    Thank you for your reply. I'm using Feko Version 2021.

    Nooshin

  • Mel
    Mel Altair Community Member
    edited February 2022

    Hi Nooshin

    Did you import the mesh from an external file?

    Usually this error does not occur if the model was built from scratch in CADFEKO. The reason is on each layer any geometry crossing the layer must have, in its mesh, triangle edges coincident with this boundary.

    So maybe to visualize, draw a flat plate vertically orientated or draw a cuboid, define some layers that cross through it, and look at the mesh that CADFEKO creates.

  • Nooshin
    Nooshin Altair Community Member
    edited February 2022
    mel_21333 said:

    Hi Nooshin

    Did you import the mesh from an external file?

    Usually this error does not occur if the model was built from scratch in CADFEKO. The reason is on each layer any geometry crossing the layer must have, in its mesh, triangle edges coincident with this boundary.

    So maybe to visualize, draw a flat plate vertically orientated or draw a cuboid, define some layers that cross through it, and look at the mesh that CADFEKO creates.

    Hi mel

    No, I didn't import the mesh. My structure has vias which are going through different layers since I have multi-layer antenna. I think these vias make problem in mesh procedure. Because, as I left them as pec and changed only the pec sheets to copper sheets, this error was solved. However, I haven't realized yet how to define those vias to copper without facing meshing error. Any advise from you will be appreciated.

    Thanks,

     

     

  • Mel
    Mel Altair Community Member
    edited February 2022

    Could you please attach your model, or maybe just a section of the model showing the layers and via(s) which also give the error.

  • Nooshin
    Nooshin Altair Community Member
    edited February 2022
    mel_21333 said:

    Could you please attach your model, or maybe just a section of the model showing the layers and via(s) which also give the error.

    I don't know whether I have permission to share the model here or not. So, I just attached some pictures of the structure. I don't know in which layer or area the error happens. The error is: "ERROR   36628: The triangles of a metal surface are not all located in the same medium". It doesn't determine any area that this error occurs. Since I saw that this error disappeared as I left the vias pec, I guess vias make problems. I hope these figures make sense to you.

  • Mel
    Mel Altair Community Member
    edited February 2022
    Nooshin said:

    I don't know whether I have permission to share the model here or not. So, I just attached some pictures of the structure. I don't know in which layer or area the error happens. The error is: "ERROR   36628: The triangles of a metal surface are not all located in the same medium". It doesn't determine any area that this error occurs. Since I saw that this error disappeared as I left the vias pec, I guess vias make problems. I hope these figures make sense to you.

    Ok a few more questions.
    Is all of the geometry parts in a Union?

    What mesh settings have you applied? And any local mesh settings on Edges or Faces?

  • Nooshin
    Nooshin Altair Community Member
    edited February 2022
    mel_21333 said:

    Ok a few more questions.
    Is all of the geometry parts in a Union?

    What mesh settings have you applied? And any local mesh settings on Edges or Faces?

    yes I united all the parts together so I have one Union for the geometry. I used the mesh default setting in feko, just define it as fine mesh. I attached a figure of that. No local mesh is defined on specific area.image

  • Mel
    Mel Altair Community Member
    edited February 2022
    Nooshin said:

    yes I united all the parts together so I have one Union for the geometry. I used the mesh default setting in feko, just define it as fine mesh. I attached a figure of that. No local mesh is defined on specific area.image

    Without the model I can not assist further on this forum.

    Please contact support directly here for off-line assistance.

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