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Plotting only part of a domain

Posted 29 sept. 2021, 03:56 UTC−4 Mesh, Results & Visualization Version 5.6 1 Reply

Anna Frost
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I'm doing a 2D simulation with a fairly complex geometry. Afterwards I want to both plot some results and do a surface integral on part of a domain; more specifically a rectangle within a complex looking domain. Is that possible? I have COMSOL version 5.6.

Dividing the domain before doing the simulation would decrease my mesh quality, and I therefore would like to avoid that solution.

1 Reply Last Post 29 sept. 2021, 17:26 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 3 years ago 29 sept. 2021, 17:26 UTC−4
Updated: 3 years ago 29 sept. 2021, 17:27 UTC−4

Hello Anna,

One approach -and there may be better ones- consists in doing the following:

  1. Solve the problem without the rectangle being present. You have done this already, I believe.
  2. Add the rectangle to the geometry
  3. Use the "Update solution" option in the Study Node
  4. Duplicate the original dataset, and add a Selection subnode to the resulting dataset, selecting only the rectangle
  5. Create a plot based on this new dataset.

I have illustrated this approach in the attached file, which is based on a toy model I created in another Discussion Forum thread today (in case you're curious: here ).

Best,

Jeff

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Jeff Hiller
Hello Anna, One approach -and there may be better ones- consists in doing the following: 1. Solve the problem without the rectangle being present. You have done this already, I believe. 2. Add the rectangle to the geometry 3. Use the "Update solution" option in the Study Node 4. Duplicate the original dataset, and add a Selection subnode to the resulting dataset, selecting only the rectangle 5. Create a plot based on this new dataset. I have illustrated this approach in the attached file, which is based on a toy model I created in another Discussion Forum thread today (in case you're curious: [here](https://www.comsol.com/forum/thread/297452/selection-of-interior-boundaries?last=2021-09-29T18:52:34Z) ). Best, Jeff

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