How can I draw a perforated cylinder in COMSOL?

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I have attached a picture of the perforated cylinder which I needed to draw like it? I am using this cylinder in electrochemical module



5 Replies Last Post 26 nov 2024, 10:37 GMT-5

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Posted: 4 days ago 24 nov 2024, 14:03 GMT-5

Using only the drawing tools within Comsol, I would be able to create that geometry by building multiple cylinders and using the array and difference operations.

You should consider whether (1) the holes are essential to the problem you want to solve and (2) whether symmetry can be used to reduce the effort of drawing and computing the problem.

Using only the drawing tools within Comsol, I would be able to create that geometry by building multiple cylinders and using the array and difference operations. You should consider whether (1) the holes are essential to the problem you want to solve and (2) whether symmetry can be used to reduce the effort of drawing and computing the problem.

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Posted: 4 days ago 24 nov 2024, 15:53 GMT-5

yes the holes are essential and affect the process greatly and the symmetry can be used. I want this holes to be 2D circles and to create a polar array and I can't do this 2 actions. Can you clarify how symmetry would help? Can you please write the actions in details as the geometry is the base for the simulation in my case? Thank you so much

yes the holes are essential and affect the process greatly and the symmetry can be used. I want this holes to be 2D circles and to create a polar array and I can't do this 2 actions. Can you clarify how symmetry would help? Can you please write the actions in details as the geometry is the base for the simulation in my case? Thank you so much

Acculution ApS Certified Consultant

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Posted: 3 days ago 25 nov 2024, 04:10 GMT-5

In 6.3 there now is a ChapGPT option that can help you code this geometry built. In 6.2 I would create a thin cylinder that cuts through the bigger cylinder, and use the Array and/or Rotate functions to copy this small cylinder up, down, and around, and make more cuts.

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René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
In 6.3 there now is a ChapGPT option that can help you code this geometry built. In 6.2 I would create a thin cylinder that cuts through the bigger cylinder, and use the Array and/or Rotate functions to copy this small cylinder up, down, and around, and make more cuts.

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Posted: 3 days ago 25 nov 2024, 12:49 GMT-5

René has provided a bit more detail, and you can also go to

https://www.comsol.com/video/3d-geometry-tools-comsol-multiphysics

for a short tutorial on how to use the geometry construction tools.

About symmetry- you haven't shown the rest of the geometry but as drawn the cylinder has rotational symmetry so the problem might be solved in a pie-like domain with symmetry boundary conditions on the cut surfaces.

Using symmetry requires some thought but can really pay off in reduced computation time for a complex 3D geometry.

René has provided a bit more detail, and you can also go to https://www.comsol.com/video/3d-geometry-tools-comsol-multiphysics for a short tutorial on how to use the geometry construction tools. About symmetry- you haven't shown the rest of the geometry but as drawn the cylinder has rotational symmetry so the problem might be solved in a pie-like domain with symmetry boundary conditions on the cut surfaces. Using symmetry requires some thought but can really pay off in reduced computation time for a complex 3D geometry.

Jeff Hiller COMSOL Employee

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Posted: 2 days ago 26 nov 2024, 10:37 GMT-5
Updated: 2 days ago 26 nov 2024, 10:39 GMT-5

I don't know if it is relevant for your application but... I'll mention that for some physics it is possible to replace a thin perforated object with a (possibly internal) boundary condition defined on a surface drawn without any of the fine details; the grille condition in CFD is an example. When such an approach can be used, not only is geometry creation much quicker, but you save lots of time and memory on meshing and solving.

Jeff

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Jeff Hiller
I don't know if it is relevant for your application but... I'll mention that for some physics it is possible to replace a thin perforated object with a (possibly internal) boundary condition defined on a surface drawn without any of the fine details; the grille condition in CFD is an example. When such an approach can be used, not only is geometry creation much quicker, but you save lots of time and memory on meshing and solving. Jeff

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