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Swept Mesh Vs Traingular Mesh

Posted 29.11.2011, 13:50 GMT-5 RF & Microwave Engineering, Studies & Solvers Version 4.2a 3 Replies

Rui Silva
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Hi folks!

I am having a bit of a problem trying to get a simulation to converge.

Initially I used a triangular mesh with a boundary layer on a 3D pipe.
Later I realized that there were some numerical variations (some triangular elements were reversed)
on the boundary layer and after getting in touch with SUPPORT I was advised to use a SWEPT mesh.

The problem is that using the swept mesh for low flow velocities the simulation converges, but for higher is a no go.
And using the triangular mesh I get convergence in both low and high velocities.

I really need to get a convergence using the swept mesh. Anyone got any thoughts on this?

I have attached the files so its more clear.
Due to the files size I have cleared the mesh and solution.
Please mesh it again.

Best Regards,

Rui
3 Replies Last Post 29.03.2012, 02:47 GMT-4
Rui Silva
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Posted: 1 decade ago 30.11.2011, 09:39 GMT-5
Anyone?
Anyone?
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 30.11.2011, 15:08 GMT-5
Hi

Another way is to mesh the input area with triangles, add a boundary layer on this face, and then sweep the "remaining" tube. your mesh elements might become qite "long" and not very square, hence have a poor quality, up to you to define a valid "dimension" node
But as you are studying turbulence, you must ensure your mesh is small enough. I'm no CFD expert so I'm not sure what final criteria to use for checking the appropriate mesh dimensions for such cases

--
Good luck
Ivar
Hi Another way is to mesh the input area with triangles, add a boundary layer on this face, and then sweep the "remaining" tube. your mesh elements might become qite "long" and not very square, hence have a poor quality, up to you to define a valid "dimension" node But as you are studying turbulence, you must ensure your mesh is small enough. I'm no CFD expert so I'm not sure what final criteria to use for checking the appropriate mesh dimensions for such cases -- Good luck Ivar
Glenston Miranda
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Posted: 1 decade ago 29.03.2012, 02:47 GMT-4

Hi

Another way is to mesh the input area with triangles, add a boundary layer on this face, and then sweep the "remaining" tube. your mesh elements might become qite "long" and not very square, hence have a poor quality, up to you to define a valid "dimension" node
But as you are studying turbulence, you must ensure your mesh is small enough. I'm no CFD expert so I'm not sure what final criteria to use for checking the appropriate mesh dimensions for such cases

--
Good luck
Ivar


Hi

I'm building this geometry and im trying to build the mesh for this.
The model's big so ive used swept meshes to reduce the no of elements.

I want to keep the no of elements to within 1 million to solve on a 16 GB system.

The default size is 1250 micrometer based on the minumum wavelength/6.
Been struggling with this for quite some time.

Any kind of help would be greatly appreciated.
Ive attached the model in this post.

Mapped1 and Swept 1 are for domain 8 which is one arm of the spiral. This mesh builds successfully.
Mapped2 and Swept 2 for domain 7 which is another arm of the spiral shows an error.
This is strange as both the arms are identical in geometry and in the mesh settings.

Regards
Glenston
[QUOTE] Hi Another way is to mesh the input area with triangles, add a boundary layer on this face, and then sweep the "remaining" tube. your mesh elements might become qite "long" and not very square, hence have a poor quality, up to you to define a valid "dimension" node But as you are studying turbulence, you must ensure your mesh is small enough. I'm no CFD expert so I'm not sure what final criteria to use for checking the appropriate mesh dimensions for such cases -- Good luck Ivar [/QUOTE] Hi I'm building this geometry and im trying to build the mesh for this. The model's big so ive used swept meshes to reduce the no of elements. I want to keep the no of elements to within 1 million to solve on a 16 GB system. The default size is 1250 micrometer based on the minumum wavelength/6. Been struggling with this for quite some time. Any kind of help would be greatly appreciated. Ive attached the model in this post. Mapped1 and Swept 1 are for domain 8 which is one arm of the spiral. This mesh builds successfully. Mapped2 and Swept 2 for domain 7 which is another arm of the spiral shows an error. This is strange as both the arms are identical in geometry and in the mesh settings. Regards Glenston

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