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[ANSYS Meshing] Bad Mesh Quality on octogonal prism

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Old   November 22, 2017, 15:12
Default Bad Mesh Quality on octogonal prism
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Christian B.
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Hello everyone,

I am currently analyzing a tower with an unstructured mesh in ICEM CFD 17.2, but I also want to create a block-structured mesh to compare both results regarding the mesh-sensitivity. I am validating the tower with a wind tunnel experiment.

I was able to narrow my problem down to a simple octogonal prism. I am not able to create a structured mesh with just this rather simple geometry.

Pictures:
https://imgur.com/a/ghfOC

The reason why I chose to split the edges like that lies within the geometry that originally lies underneath it. With these splits I get no problems with the other geometry underneath it. The only bad elements lie right above the prism as seen in the last picture.

Thanks for any help on this!
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Old   November 23, 2017, 05:58
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Gwenael H.
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Hi Christian,



The bad quality elements come from your inner blocking. I would go for an Ogrid type approach, or switch to a Y-block for the 4 problematic blocks.


Have fun
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