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Old   January 15, 2014, 12:55
Default [CFX-Post] - Boundary layer volume integration
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Hi everyone!
I'm doing some research on airfoils, and I have been trying to find a way to calculate the amount of entropy that is being generated in the boundary layers of an airfoil. The main idea is to be able do a breakdown of where in the airfoil (LE,TE, suction side, pressure side, etc.) we have the most losses.

The expressions I use are for a volumetric entropy generation rate (J/(K m3 s), and in order to get an understanding of which sections of the blade are the most detrimental for performance, I would like to integrate the generated entropy in the boundary layer volume.

The main approach I have considered:
Constructing a volume on and extending in the normal direction from the airfoil surface, with a height close to the boundary layer thickness. Then with CFX's own subroutines, I could perform a volume integration.
Question is, how to build a volume like that?

I'd be grateful for any suggestions on how to approach this issue! Or if there are any other post-processors that are capable of volume integration of this type.

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Old   January 15, 2014, 14:15
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Edmund Singer P.E.
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I suppose you could use isovolume. Few ways to use isovolume depending on how you set up your model. Generate it for values of y+ below what you deem correct, or generate it for values of wall distance below what you deem correct, or I could go on...

Pick a variable that will describe your BL, you can even generate your own based on your own criteria, and use isovolume to isolate it to the region you want.
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