[ANSYS Meshing] Can fine mesh near wall substitute for inflation layers?

evevev · January 3, 2018, 16:14

Hi, I have recently had the most luck using cutcell meshing for a project im working on, except that I can not create an inflation layer from either the auto inflation or local inflation controls. Would refining the mesh near the walls be sufficient to substitute for proper inflation layers?

annan · January 4, 2018, 10:01

Hey,
Inflation layers provide a good mesh resolution near the boundary to resolve the boundary layer. I think that adding more layers near the walls (refining) in order to have something similar to inflation layers is sufficient. At least, this worked out for me.
You could also use wall functions when setting up your solution, but inflation layers give more accurate results.
Hope this helps.
Good luck

evevev · January 4, 2018, 10:11

Quote:

Originally Posted by annan

Hey,
Inflation layers provide a good mesh resolution near the boundary to resolve the boundary layer. I think that adding more layers near the walls (refining) in order to have something similar to inflation layers is sufficient. At least, this worked out for me.
You could also use wall functions when setting up your solution, but inflation layers give more accurate results.
Hope this helps.
Good luck

Thank you for your response. I guess one reason I am having creating inflation layers is because of the curvature/dirtyness of my geometry, but this does make it easy to make smaller cells near the wall via the sizing functions

Christophe · January 4, 2018, 17:59

You will end up with perhaps way too many elements if resolved to Y+ < 1, as you will have a low aspect ratio from "refined" elements and thus a huge element count. With inflation layers, you get aspect ratios of sometimes 1000:1 so it doesn't use as many elements for a small first element height.

January 3, 2018, 16:14	Can fine mesh near wall substitute for inflation layers?	#1
evevev New Member Evan Join Date: Dec 2017 Posts: 12 Rep Power: 8	Hi, I have recently had the most luck using cutcell meshing for a project im working on, except that I can not create an inflation layer from either the auto inflation or local inflation controls. Would refining the mesh near the walls be sufficient to substitute for proper inflation layers?

January 4, 2018, 10:01		#2
annan Member annan Join Date: Nov 2016 Posts: 72 Rep Power: 9	Hey, Inflation layers provide a good mesh resolution near the boundary to resolve the boundary layer. I think that adding more layers near the walls (refining) in order to have something similar to inflation layers is sufficient. At least, this worked out for me. You could also use wall functions when setting up your solution, but inflation layers give more accurate results. Hope this helps. Good luck evevev likes this.

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January 4, 2018, 17:59		#4
Christophe Member Join Date: Jan 2015 Posts: 62 Rep Power: 11	You will end up with perhaps way too many elements if resolved to Y+ < 1, as you will have a low aspect ratio from "refined" elements and thus a huge element count. With inflation layers, you get aspect ratios of sometimes 1000:1 so it doesn't use as many elements for a small first element height.