Visualizing electric fields of Plasma Simulation

ParaView Support
1

Hello.
I am working on understanding the example DBD Simulation from the project called “SOMAFOAM”. The project is based on foam-extend-4.0. The example that I am running is called “ArgonDB”, the link for the same is: SOMAFOAM/examples/plasmaDielectric/ArgonDBD at main · vayyaswamy/SOMAFOAM · GitHub

Goal:
I want to visualize the electric field generated around the edges of the electrodes, when the plasma is generated.
Problem:
I tried using the Glyph filter, but instead of getting a field, I get single arrows coming out from the sides. I am relatively new to this domain, and I have little idea on what is going on.
If it matters, my setup is:
Ubuntu 18.04 on WSL. I run the command blockMesh and somaFoam (the solver), and it runs the simulation. Once the simulation is run, the *.foam file is opened in ParaView 5.13.3 (on Windows).

Help Needed:
How can I visualize the electric fields better?

image
image3829×1960 345 KB

2

You probably want to reduce the scaling, you currently have very big arrows.

3

Hello. Thank you for responding.
I did play with the scale factor. The current (not in the picture) Scale Factor is: 0.00000000000001.
The problem is, I expect to see fields, but instead, it shows just two arrows, as shown in the image. I think my method to visualize the electric field is incorrect.

4

Please share your data

5

I am very sorry, but I am not sure if I follow.
Do you want me to share the .vtk files? The file that I have imported in ParaView is ".foam" file.
Again, I am very sorry for not following.

6

Then zip the whole folder containing the .foam file and share it using wetransfer or similar.

7

Here: Unique Download Link | WeTransfer
Thanks a lot for your support.

8

You mesh contain very elongated cells in the Z and X direction, there is not much data to draw glyphs from:

image
image1354×1139 56.8 KB

9

Thank you for the efforts.
How did you manage to get this view?
Also, is there another filter that I can use to visualize the electric fields?

10

CellDataToPointData + Glyph

Also, is there another filter that I can use to visualize the electric fields?

As I said, there is no data to visualize apart the few elongated cells.

1 Like
11

I will have to learn how to do that. Can you please tell me which file you used to get that image?

I believe more data around the edges should exist at Time #17 (8e-08). We run the simulation and after few micro or milli seconds, the voltage field is generated.

12

Isn’t it possible that this analysis is being performed with a 1D analysis model? For example, the following link also describes a 1D analysis:

While OpenFOAM primarily handles 3D models, when you want to perform a 1D simulation, “empty” boundary conditions are applied to two dimensions, leaving only one dimension active for calculation. In fact, in this example, the type keyword for otherfaces within the boundary file in the processor0\constant\polyMesh directory is set to empty.

2 Likes
13

Thank you so much for sharing this PDF.
If I understand your comment well, are you saying that my example is already “good enough” for a 1-D visualization? And I should be able to achieve what I want to? i.e., I should be able to see the electric field from the edge of the electrode when plasma is generated by selecting appropriate filters?

14

I’m not sure how to best display a suitable figure for observing plasma generation, but perhaps a procedure like the following could work:

  • In the Plot Over Line filter, click the Y Axis button to map values along a line on the Y-axis.
  • In the Advanced Settings (turn on the gear icon), set a large value for Line Width.
  • For example, display a contour plot of the electric field (E) at 8e-8 seconds.

line_width
line_width1055×718 183 KB

state file:
line_width.pvsm (392.8 KB)

1 Like
15

Thank you so much for the efforts. Please excuse me for asking some basic questions. I am extremely new to this tool and the technology.

  1. How did you figure out the values required for the field “Line Parameters”? I am given to understand that it is the most important part for viewing this plot. My previous attempts had been unsuccessful because I could not figure out the right values for this field.
  2. How do I know if the visuals are from the edge of the electrode?
    image
    image1099×348 12.7 KB
16
  1. I clicked the “Y Axis” button without specifically considering the start and end points of the line.
  2. If you mean you want to set the Y-coordinates of the electrode as the start and end points of the line, you can find the Y-coordinates using the following method:
    2.1. In the OpenFOAM Reader settings, check both /dielectric_1/patch/electrode and /dielectric_2/patch/electrode and load them.
    check_electrode
    check_electrode1467×786 267 KB

    2.2. You can then find the coordinates using tools like “Hover Points On” in the selection tools.
    hover_points_on
    hover_points_on1421×816 198 KB

    Alternatively, you can check the “Data Axes Grid” option in the Properties tab.
    Data_Axes_Grid
    Data_Axes_Grid1468×578 268 KB