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[ANSYS Meshing] Poor mesh metrics using inflation on wall of helical pipe

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Old   May 21, 2019, 13:08
Default Poor mesh metrics using inflation on wall of helical pipe
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Hi,

I'm fairly inexperienced with meshing and hope this is a trivial problem!

I have a helical pipe model which needs to be simulated with a K-w SST turbulence model for a study.

For this model I need to reduce my first layer height of the mesh to y+<1. However when I try to assign any kind of inflation layer on the wall my uniform grid turns in to unstructured tetrahedral and wedge elements and I get really poor mesh metrics.

My first layer height needs to be in the region of 2.5x10-4 mm.

The pipe has a height of 40mm, diameter of 1mm, coil diameter of 6.6mm and pitch of 20mm.

I've attached an example to show how the mesh changes, even with a large first layer I still get this issue.
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File Type: jpg mesh metrics with inflation layers.jpg (92.2 KB, 21 views)
File Type: jpg mesh metrics without inflation layers.jpg (89.6 KB, 17 views)
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Old   May 22, 2019, 03:31
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siw
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Try the MultiZone with inflation layer for the wall capture and adjust the inflation details to suit your simulation. Use a Face Meshing for the O-grid.
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Old   May 23, 2019, 10:19
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Thanks that looks great! are you able to send the settings you used for each of the features? just as a basis so i can modify for my own wall requirements
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Old   May 23, 2019, 12:56
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I did not apply any settings to the MultiZone or Face Meshing. I set a global element size. I set Smooth Transition in the Inflation Layer and 10 layers. That is all.
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Old   July 4, 2019, 10:25
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Hi Stuart, sorry for the delayed reply. It worked really nicely thanks for the help!
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boundary layer, helix, inflation, mesh metrics, pipe flow

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