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time dependent study, external current density in mf model.

Hello, I am using COMSOL version 4.2, module AC/DC, Magnetic Fields (mf) model, 2D axisymmetric wizard and time dependent study. I have created in "Global Definitions" a function of type "Sawtooth"...

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Re: time dependent study, external current density in mf model.

Isa, did you assign a unit to your Sawtooth function? It should be unitless for your application. Cheers Edgar

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Re: time dependent study, external current density in mf model.

Hello, thank-you Edgar. No, I define it simply. But when I plot it, as title appears "F1Saw(t)", so it seems that by default it takes the variable time, doesn't it? How should I do it? Thanks again in...

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Re: time dependent study, external current density in mf model.

Sorry I still didn't received Comsol 4.2 but with 4.1 I set up a model with a triangle function multiplied by Jc.

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Re: time dependent study, external current density in mf model.

Dear Loic, Thank-you very much for your help! I have opened your file in both, comsol 4.1 and 4.2, and yes, you are right, it allows me to introduce the external current density as "Jc*tria1(t)" but...

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Re: time dependent study, external current density in mf model.

I don't know if it is possible to do it unitless but as you said, it is a warning not an error. Comsol is just saying that he cannot determine it automatically.

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Re: time dependent study, external current density in mf model.

Ok. Understood. Again, thank-you! Best regards, Isa

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Re: time dependent study, external current density in mf model.

Isa, you might consider to define a constant with an appropriate unit, assign the value 1 and multiply with your function to remove the unit issue. Cheers Edgar

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Re: time dependent study, external current density in mf model.

Hi, the correct way calling a time function *without orange* marks is: sawtooth(t[1/s])[A/m^2] The [1/s] removes the unit [s] and creates a unitless input for the function call. The [A/m^2] adds the...

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Re: time dependent study, external current density in mf model.

Dear Sven, I have tried your suggestion and, obviously (it makes sense), it has worked! Thank-you very much! Best regards, Isa

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