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Mesh on a cylinder that specifies the numbers of elements longitudinally and cross sectionally

Posted 11 apr 2024, 03:32 GMT-4 9 Replies

Carl Xu
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How to mesh a cylinder that specifies the numbers of elements longitudinally and cross sectionally? Swept seems to work for longitudinal elements.

9 Replies Last Post 2 mag 2024, 03:55 GMT-4
Magnus Ringh COMSOL Employee

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Posted: 7 months ago 11 apr 2024, 06:56 GMT-4

Hi Carl,

I'm not an expert on meshing, but I think you can do it by specifying a custom mesh size along the edges for the bottom circular boundary and then sweep based on that mesh with another custom mesh size for the longitudal sweep direction. That should give you control of the swept mesh in both directions.

Best regards,

Magnus

Hi Carl, I'm not an expert on meshing, but I think you can do it by specifying a custom mesh size along the edges for the bottom circular boundary and then sweep based on that mesh with another custom mesh size for the longitudal sweep direction. That should give you control of the swept mesh in both directions. Best regards, Magnus
Carl Xu
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Posted: 7 months ago 12 apr 2024, 09:59 GMT-4

Hi Magnus, Thank you so much. How to specify a custom mesh size along the edges for the bottom circular boundary is what I wonder!

Hi Magnus, Thank you so much. How to specify a custom mesh size along the edges for the bottom circular boundary is what I wonder!
Magnus Ringh COMSOL Employee

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Posted: 7 months ago 12 apr 2024, 10:10 GMT-4

Hi Carl,

Use an Edge mesh generator from Mesh>More Generators>Edge and apply it to the bottom circumferential edges. Then add a Size subnode and choose Custom under Element Size so that you can set a fixed mesh element size under Element Size Parameters.

Best regards,

Magnus

Hi Carl, Use an **Edge** mesh generator from **Mesh>More Generators>Edge** and apply it to the bottom circumferential edges. Then add a **Size** subnode and choose **Custom** under **Element Size** so that you can set a fixed mesh element size under **Element Size Parameters**. Best regards, Magnus
Carl Xu
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Posted: 7 months ago 13 apr 2024, 03:36 GMT-4

Hi Magnus, Thank you so much. I followed your advice but found that Edge 1 and swept 1 don't play well together. I specify first the mesh density to be extremely fine in Edge 1, then specify the element numbers swept 1, the latter overthrowing the former.

Hi Magnus, Thank you so much. I followed your advice but found that Edge 1 and swept 1 don't play well together. I specify first the mesh density to be extremely fine in Edge 1, then specify the element numbers swept 1, the latter overthrowing the former.

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Magnus Ringh COMSOL Employee

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Posted: 7 months ago 15 apr 2024, 03:01 GMT-4

Hi Carl,

This approach works well for me in version 6.2. I suggest that you contact COMSOL Support for any specific issues that you may have with your model.

Best regards,

Magnus

Hi Carl, This approach works well for me in version 6.2. I suggest that you contact COMSOL Support for any specific issues that you may have with your model. Best regards, Magnus

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Carl Xu
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Posted: 7 months ago 15 apr 2024, 10:09 GMT-4

Hi Magnus, Thank you. I can't see your cross sectional meshing clearly enough. Isn't it axisymmetric?

Hi Magnus, Thank you. I can't see your cross sectional meshing clearly enough. Isn't it axisymmetric?
Magnus Ringh COMSOL Employee

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Posted: 7 months ago 16 apr 2024, 03:58 GMT-4

Hi Carl,

The mesh nodes are evenly distributed along the base (and top) perimeter, and by default, the bottom surface uses a quadrilateral mesh, and the cylinder is swept meshed with hexahedron mesh elements. If desired, you can instead use a triangular mesh on the botton surface; the swept mesh for the cylinder then uses prism mesh elements.

Best regards,

Magnus

Hi Carl, The mesh nodes are evenly distributed along the base (and top) perimeter, and by default, the bottom surface uses a quadrilateral mesh, and the cylinder is swept meshed with hexahedron mesh elements. If desired, you can instead use a triangular mesh on the botton surface; the swept mesh for the cylinder then uses prism mesh elements. Best regards, Magnus
Carl Xu
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Posted: 7 months ago 26 apr 2024, 23:30 GMT-4

Hi Magnus thank you. I followed your advice as attached. The only weakness for me is that on the circular boundary the mesh is too biased. Is it possible to build one that is not so biased in the two perpendicular directions?

Hi Magnus thank you. I followed your advice as attached. The only weakness for me is that on the circular boundary the mesh is too biased. Is it possible to build one that is not so biased in the two perpendicular directions?

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Magnus Ringh COMSOL Employee

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Posted: 7 months ago 2 mag 2024, 03:55 GMT-4

Hi Carl,

I guess it's a matter of designing a suitable face mesh on the bottom boundary. I'm not sure that I can assist with further advice here. Please contact the COMSOL Support team if you have additional questions.

Best regards,

Magnus

Hi Carl, I guess it's a matter of designing a suitable face mesh on the bottom boundary. I'm not sure that I can assist with further advice here. Please contact the COMSOL Support team if you have additional questions. Best regards, Magnus

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