How can I remove this error in wire meshing? [FEKO 2023.1 Version]

sswh2
sswh2 Altair Community Member
in Community Q&A

Hi , My probe radius is 5mm in my model, I tried using Fine /standard meshing option in my model, but for both cases, there is the same error msg "The ratio of probe radius to length is very large" . My model is attached here. Kindly check the model and

Kai_Fong_lee_case_1.cfx

help me to fix this error message in my simulation. Thanks in advance!

image.png

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Best Answer

  • Jaehoon
    Jaehoon
    Altair Employee
    Answer ✓

    If you'd like to consider the feeder wire's radius, you need to replace the wire with a 3D geometry (cylinder).

    Please refer to the following steps.

    1. Draw a cylinder. ← after deleting the wire feeder.
    2. Region medium → Free space
    3. Split the cylinder and union.
    4. Apply the edge port. → Voltage source.
    image.png

    Best regards,

    Jaehoon

Answers

  • Jaehoon
    Jaehoon
    Altair Employee

    Hello,

    Feko's wire segment mesh is based on the thin wire approximation. Therefore, the wire segment's radius should be smaller than the segment's length (Maybe 5~10 times smaller).

    Please change the wire segment radius (5 → 0.001) in Modify mesh setting as shown below.

    image.png

    Best regards,

    Jaehoon

  • sswh2
    sswh2 Altair Community Member
    edited December 21

    @Jaehoon sir, my requirement is my probe radius should be 5/2( 2.5) mm then how can I fix this issue? I can not change it thats the requirement, kindly tell me how can I fix this error then wthout creating proper cylindrical coax probe?

  • sswh2
    sswh2 Altair Community Member

    @Torben Voigt sir can you help fixing this error? my probe radius should be 2.5mm

  • sswh2
    sswh2 Altair Community Member

    @Jaehoon sir I can't change the radius thats the requirement then how can I fix the error?

  • Jaehoon
    Jaehoon
    Altair Employee
    Answer ✓

    If you'd like to consider the feeder wire's radius, you need to replace the wire with a 3D geometry (cylinder).

    Please refer to the following steps.

    1. Draw a cylinder. ← after deleting the wire feeder.
    2. Region medium → Free space
    3. Split the cylinder and union.
    4. Apply the edge port. → Voltage source.
    image.png

    Best regards,

    Jaehoon

  • sswh2
    sswh2 Altair Community Member

    @Jaehoon sir thanks, let me see how this cylinder effects my s11 .

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