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[ANSYS Meshing] Poor mesh metrics using inflation on wall of helical pipe |
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#1 |
New Member
Join Date: May 2019
Posts: 7
Rep Power: 7 ![]() |
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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#2 |
Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 739
Rep Power: 26 ![]() |
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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#3 |
New Member
Join Date: May 2019
Posts: 7
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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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#4 |
Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 739
Rep Power: 26 ![]() |
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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#5 |
New Member
Join Date: May 2019
Posts: 7
Rep Power: 7 ![]() |
Hi Stuart, sorry for the delayed reply. It worked really nicely thanks for the help!
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Tags |
boundary layer, helix, inflation, mesh metrics, pipe flow |
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