Axis Symmetric Postprocessing

ParaView Support
1

Hi there, I’m learning Elmer for electromagnetic simulations. I’m also using the opportunity to learn and use Paraview.

The main goal is to compare FEMM 2D and Elmer 2D.

For Cartesian problems, I can integrate variables (Paraview) over surfaces and get the exact same results.

However, after different types of trials, I can’t reproduce the results for axis Symmetric solution. After reading other topics, my doubt remains. Thus I decided to ask.

Does Paraview knows that the result is axis Symmetric by default?

If I integrate variables over surface, I was expecting to get a volume, not an area. Also, I get a wrong contour plot.

Probably, I just need brainstorming to understand if this can be a paraview problem, as it doesn’t seems to be Elmer solution problem.

https://www.elmerfem.org/forum/viewtopic.php?t=8231

I’ve posted the link for the Elmer fórum. I hope not to break any rules.

2

I’m not following your whole question but I can answer this.

ParaView has no idea if your geometry is symmetric or not and does not make such assumption.

3

Perfect. You’ve answered it.

From my understanding, to integrate the result (axis symmetric) using Paraview, I need to convert it to 3D and than integrate.

I can do that using Transform → Rotate Extrusion.

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However, I still get the wrong integral result. Probably I’m not selecting the entire body?
Any suggestion?

4

Is there a way to convert x,y to r,z?

5

If you know the axis of rotation, computing r and z should be trivial.

6

Hi @mwestphal , I do know the axis of rotation. Can you give me a tip of how to calculate it?

7

You should be able to find that on the internet without issues, here is one

8

Really sorry about the confusion. It is clear how to convert (mathematically speaking). However, it’s unclear how to manipulate coordinates in paraview. I can only view Variables Results.

I’m still learning paraview, the workflow and filters are not completely clear.

Should I use a specific filter or I should use calculator? If so, where can I see the list of available variables?

Thx

9

Hi @thalesmaoa

Indeed, Calculator and PythonCalculator should let you compute that easily

Best,