Surrounding irregular object with atmosphere

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Gary R
Posts: 60
Joined: Thu May 28, 2015 10:59 pm

Surrounding irregular object with atmosphere

Post by Gary R »

Normally when doing a 2D model of something, I surround the model with a box to represent the atmosphere or some such. But this model (see attachment) Is so irregular that that doesn't work. With the model shown, gmsh meshes over the whole model. Does anyone have any suggestions for handling this situation?
ScreenshotModel2D.png
ScreenshotModel2D.png (5.17 KiB) Viewed 1604 times
ScreenshotGmshImage.png
ScreenshotGmshImage.png (21.37 KiB) Viewed 1604 times
Gary R
KAKM
Posts: 109
Joined: Tue May 04, 2021 12:17 am

Re: Surrounding irregular object with atmosphere

Post by KAKM »

It appears that gmsh is meshing the box and all the different sections of your model separately. I haven't used gmsh enough to know how to get it to stop doing that (maybe you forgot to merge the box & model?), but it looks like you're trying to model internal flow, which can be done without a surrounding atmosphere. What you can do instead is make the places where fluid is coming into your part inlet boundaries and the places where it is leaving outlet boundaries.
Gary R
Posts: 60
Joined: Thu May 28, 2015 10:59 pm

Re: Surrounding irregular object with atmosphere

Post by Gary R »

Thanks for the reply. Unfortunately part of the modeling is to see the mixing of different gasses. The problem extends beyond the outlet nozzle.

Gary R.
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Kunda1
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Re: Surrounding irregular object with atmosphere

Post by Kunda1 »

Moved to FEM subforum
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