Edge sizing and structured mesh

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Last Post 10 June 2019
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rchristensen posted this 06 June 2019

Hello,

I am trying to generate a structured mesh for one of my models. It's a hexagonal unit cell - 6 finned tube surrounded by fluid as well as fluid flowing through it's cylindrical center. See below the cross sectional view.

The mesh that I have generated is still pretty coarse and I wish to refine it.

However, when I try to increase the number of nodes along the edges, it messes up the mesh in the center of the tube.

And I also get the following warning.

I'd appreciate any suggestions that you guys would provide.

Thanks,
Rich

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rwoolhou posted this 07 June 2019

Can you omit the square in the centre channel and use a pave mesh? That should help as it's the change in cell size over the small gap that's causing some of the problems.

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rchristensen posted this 07 June 2019

Thank you for the suggestion. I did that and it did help.

However, there is still a small mismatch between the grid

How do I go about producing something like this?

Thank you,
Rich

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peteroznewman posted this 09 June 2019

The element circled is not a mismatch, it is just highly distorted. Adding an Inflation mesh control to the boundary of the inner fluid cylinder will help this.

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rchristensen posted this 09 June 2019

Thank you, for your suggestion. I used an inflation layer and it looks a lot better.

Rich.

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rwoolhou posted this 10 June 2019

To add, the last image is a "butterfly" or "o-grid" mesh dating back to the older methods where we needed mapped mesh blocks. We tend to use pave (unstructured) mesh now as it's simpler to generate.