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Integration over portion of a surface

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Old   July 15, 2010, 12:01
Default Integration over portion of a surface
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Joseph Tipton
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I would like to know if there is an easy way to calculate a function on a portion of a surface in CFX Post. For example, what would be the easiest way to integrate the wall shear stress in the fully developed region of a duct flow? So far, the only work around I can see is to run the simulation, observe the flow development length, modify the geometry to split the duct into two regions, and then rerun the simulation.
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Old   July 15, 2010, 19:05
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Glenn Horrocks
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Use a contour line to define your fully developed region on the surface, make a user surface defined by the contour, do the integration on the user surface.
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Old   July 16, 2010, 09:08
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Joseph Tipton
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Thank you for the reply!

I let my axial dimension be the contour plot variable, made several user surfaces for each level of the contour in the fully developed region, and then combined them in a surface group. I'm assuming that's the easiest method.
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Old   July 18, 2010, 06:18
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If it works then it is all good.
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Old   February 4, 2011, 17:43
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Is there way to apply this method to volumes?
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Old   February 5, 2011, 04:53
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Apply what method?

If you mean calculate functions on sub-volumes, then yes. Define a volume as a sub-region of the full domain and calculate the CEL expression on the defined volume.
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