Inflation layers elements larger than rest of the elements

RobBanks · February 1, 2018, 10:43

Hi everyone.

I posted a similar question in the Meshing forum but Idk if this fits better into this one.

I have the following doubt: I'm running some sims on airflow through a solar collector.

When developing the mesh independence study, I find that in some meshes the elements in the inflation layers (2 layers, generated from 2 opposite, parallel faces) are larger than the elements of the rest of the mesh.

I don't know if this would represent a problem when calculating the final results, as I understand that according to the Y+ theory (which I understand only to the surface) these elements should be smaller than the rest of the mesh to ensure the proper representation of the boundary layer.

I'm using a K-epsilon model.

Any assistance, would be greatly appreciated, thank you, very much!

Gert-Jan · February 1, 2018, 15:51

- Stop using k-epsilon. Use SST which has a wider applicability.
- do a grid sensitivty analysis.
- then number of layers depends on the question that you are trying to answer when using cfd.
- I never use 2 layers. 5 is the minimum
- What is you Y-plus value?

February 1, 2018, 10:43	Inflation layers elements larger than rest of the elements	#1
RobBanks Member Roberto Join Date: Feb 2015 Posts: 33 Rep Power: 11	Hi everyone. I posted a similar question in the Meshing forum but Idk if this fits better into this one. I have the following doubt: I'm running some sims on airflow through a solar collector. When developing the mesh independence study, I find that in some meshes the elements in the inflation layers (2 layers, generated from 2 opposite, parallel faces) are larger than the elements of the rest of the mesh. I don't know if this would represent a problem when calculating the final results, as I understand that according to the Y+ theory (which I understand only to the surface) these elements should be smaller than the rest of the mesh to ensure the proper representation of the boundary layer. I'm using a K-epsilon model. Any assistance, would be greatly appreciated, thank you, very much!

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February 1, 2018, 15:51		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	- Stop using k-epsilon. Use SST which has a wider applicability. - do a grid sensitivty analysis. - then number of layers depends on the question that you are trying to answer when using cfd. - I never use 2 layers. 5 is the minimum - What is you Y-plus value?