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Plotting the real x component of magnetic field against time

Posted Jul 1, 2021, 7:42 a.m. EDT RF & Microwave Engineering 5 Replies

Adam Lafferty
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I am working on an cavity resonator and would like to seperately plot the x and y components of the magnetic field against time. I have tried to work with 1d line graphs but the plot will either come up with an error or blank. I have even tried putting the data in a table then graphing it in excel but found that to be the complex number not real.

Any help would be greatly appreciated

5 Replies Last Post Jul 2, 2021, 1:46 p.m. EDT
Robert Koslover Certified Consultant
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Posted: 3 years ago Jul 1, 2021, 2:04 p.m. EDT
Updated: 3 years ago Jul 1, 2021, 2:09 p.m. EDT
  1. Is this a time-domain or frequency-domain model? In a time-domain model, the fields are generally real-valued. In a frequency-domain model, they are complex (to conveniently handle phase) but then you wouldn't normally be plotting fields "against time." Thus, your question is puzzling.
  2. I encourage you to post your .mph file to the forum so that others can examine it and offer their suggestions.
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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
1. Is this a *time-domain* or *frequency-domain* model? In a time-domain model, the fields are generally real-valued. In a frequency-domain model, they are complex (to conveniently handle phase) but then you wouldn't normally be plotting fields "against time." Thus, your question is puzzling. 2. I encourage you to post your .mph file to the forum so that others can examine it and offer their suggestions.
Adam Lafferty
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Posted: 3 years ago Jul 1, 2021, 4:04 p.m. EDT

the model is time dependent, we wish to extract the field components Hx and Hy and plot them as a function of time.

I have attached the file below

the model is time dependent, we wish to extract the field components Hx and Hy and plot them as a function of time. I have attached the file below
Robert Koslover Certified Consultant
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Posted: 3 years ago Jul 1, 2021, 11:18 p.m. EDT

Adam, you attached the .lock file. That is a tiny file that appears in your directory when your .mph file is open. It doesn't contain the model. Ideally, you should close the model file, then attach the .mph file. :)

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Adam, you attached the .lock file. That is a tiny file that appears in your directory when your .mph file is open. It doesn't contain the model. Ideally, you should close the model file, *then* attach the .mph file. :)
Adam Lafferty
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Posted: 3 years ago Jul 2, 2021, 6:08 a.m. EDT

That should be it below

That should be it below
Robert Koslover Certified Consultant
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Posted: 3 years ago Jul 2, 2021, 1:46 p.m. EDT
Updated: 3 years ago Jul 2, 2021, 1:48 p.m. EDT

Your model, at least as you posted it, doesn't have a mesh. And... by saying that, I don't mean that it was simply cleared by choosing "Clear All Meshes." Rather, you don't seem to have specified the mesh at all! Finite element models need meshes. Interestingly, it still executes (sort of) but immediately produces a warning that says "No mesh on domain 1 in the geometry with tag geom1. This may lead to incorrect results." Well, that's putting it rather mildly. So... I encourage you to mesh your problem space properly. Then, you can move on to dealing with some of the other possible problems with the way you've defined your model. But first things first.

-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Your model, at least as you posted it, *doesn't have a mesh*. And... by saying that, I don't mean that it was simply *cleared* by choosing "Clear All Meshes." Rather, you don't seem to have *specified* the mesh at all! *Finite element models need meshes*. Interestingly, it still executes (sort of) but immediately produces a warning that says "No mesh on domain 1 in the geometry with tag geom1. This may lead to incorrect results." Well, that's putting it rather mildly. So... I encourage you to mesh your problem space properly. Then, you can move on to dealing with some of the other possible problems with the way you've defined your model. But first things first.

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