Boundary Layer Thickness Variation

mazhar16823 · July 23, 2020, 08:21

Hi Everyone,

I have noticed that the BL Thickness (boundary layer edge) post-simulation is less than what I provided to the prism layer mesher. In this case, do I need to reduce the number of prism layers and increase the growth rate? or I have to keep the same number of prism layers and reduce the growth rate to encapsulate the whole boundary layer?

Thanks for your time.

Best regards,

aero_head · December 1, 2020, 18:47

Hello Mazhar,

If you are using ICEM CFD, it is better to generate one prism layer of the total thickness of the boundary layer. So I would choose the section option.

You can then use Edit Mesh > Split Mesh >Split Prisms to divide this layer into the required number of layers. To ensure the first layer is equal to the thickness that gives you y+ = 1, you can use Fixed initial height option.

I noticed this is from awhile back, what did you do in the end?

July 23, 2020, 08:21	Boundary Layer Thickness Variation	#1
mazhar16823 Senior Member MA Join Date: Mar 2020 Posts: 163 Rep Power: 6	Hi Everyone, I have noticed that the BL Thickness (boundary layer edge) post-simulation is less than what I provided to the prism layer mesher. In this case, do I need to reduce the number of prism layers and increase the growth rate? or I have to keep the same number of prism layers and reduce the growth rate to encapsulate the whole boundary layer? Thanks for your time. Best regards,

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December 1, 2020, 18:47		#2
aero_head Senior Member Kira Join Date: Nov 2020 Location: Canada Posts: 435 Rep Power: 8	Hello Mazhar, If you are using ICEM CFD, it is better to generate one prism layer of the total thickness of the boundary layer. So I would choose the section option. You can then use Edit Mesh > Split Mesh >Split Prisms to divide this layer into the required number of layers. To ensure the first layer is equal to the thickness that gives you y+ = 1, you can use Fixed initial height option. I noticed this is from awhile back, what did you do in the end?