Discussion Forum

Dear Noemi,

To see the skin effect you have to mesh enough (minimum two elements in the skin depth). Please find more information on this COMSOL blog article about skin effect simulation with COMSOL Multiphysics: https://www.comsol.com/blogs/how-to-model-conductors-in-time-varying-magnetic-fields/

I hope this helps !

Mickaël

Hi Mickaël, thank you for your answer, I have already read this article, but I have not been very helpful. In simulating my coil I used a finer mesh, the AC / DC module, and in the study I entered the geometry analysis and the frequency domain, I used magnetic and electrical fields as physics, but I do not see variations in resistance and inductance to vary the frequency or skin effect on the current density and I can not understand why the frequency is not perceived even though I have used the frequency domain. Thank you for your answer

Hi Noemi,

Please make sure to use the Coil as "Solid Conductor" NOT a Homogenized Multi-turn Coil. Using Solid Conductor you will see the explicit distribution of current in the conductor unlike the other. Please take a look through these useful examples:

1. https://www.comsol.com/model/modeling-of-a-3d-inductor-10299
2. https://www.comsol.com/model/integrated-square-shaped-spiral-inductor-129
3. https://www.comsol.com/model/inductance-of-a-power-inductor-1250

Good Luck.

Nirmal

Hi Nirmal, thanks for your answer, How can I replace homogenized multi-turn coil with solid conductor? Thanks

Hi Noemi,

When you add the "Coil" feature in Magnetic Fields or Magnetic and Electric Fields, in the settings window, you have two choices under "Conductor model" 1. Single conductor (sorry, I wrote the wrong name "NOT" Solid Conductor... ) 2. Homogenized multi-turn

If you choose the first option, it will consider both the skin effect and proximity effects.

Hope this helps.

Nirmal

Thanks Nirmal I try to use this option with the physical magnetic fields, as in magnetic and electric fields it is not present, there is only multiturn conductor

Thank you

Hi Noemi,

You can use the "Lumped Port" instead of coil as done in this example. The Lumped Port support both the AC/Frequency Domain as well as Time Domain simulations. This would take into account the Eddy Current and well as Proximity Effect. https://www.comsol.com/model/download/524331/models.acdc.inductor_3d.pdf

BR/Nirmal

Hi Noemi,

You can use the "Lumped Port" instead of coil as done in this example. The Lumped Port support both the AC/Frequency Domain as well as Time Domain simulations. This would take into account the Eddy Current and well as Proximity Effect. https://www.comsol.com/model/download/524331/models.acdc.inductor_3d.pdf

BR/Nirmal

Hello, Nirmal Could you tell me how can I see skin effect in conductor in Magnetic Field physics in time dependent study? Because 'Single conductor' of 'Coil' feature doesn't work in TD study, and 'Homogenized multi-turn' ignores the skin effect. Thank you!

Hi Pavel,

I did send you the sample example via Private Message.

Hope that will be useful.

BR/Nirmal