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measure flow through a hole in cfd post

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Old   August 19, 2010, 09:10
Default measure flow through a hole in cfd post
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Hi,

I have a problem in CFD post.
Inside my fluid domain, I have a structure which has two holes for an opening.
I want to compare the fluid flow of those two holes.
I could use an expression to evaluate the mass flow.
However I dont have a location (plane, etc.) for those two holes.
Is it possible to select create a location for the hole?

The geometry looks something like this:

Code:
---  ----  ---
           
           
           
           
--------------
Thanks a lot!
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Old   August 19, 2010, 18:26
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Yes. It is a bit clunky but it can be done. You need to define a surface to integrate the flow over somehow - options include planes with limits, contour surfaces or I think you can import XYZ points as user surfaces. Then use the function calculator to get the flow rate (or whatever you want) across the surface.
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Old   August 20, 2010, 05:19
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thanks, that helped. now i can calculate the massflow with an expression, but how could i calculate the heat flow?
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Old   August 22, 2010, 18:29
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use the function calculator to get the heat flux integrated over the surface.
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Old   August 23, 2010, 03:20
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but it says that the variable is not available on the plane. is it in general only available on boundaries and interfaces, as it says in the help or is there a chance to use it on planes?
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Old   August 23, 2010, 07:36
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Sorry, I meant general heat flux, not the variable heat flux which is only at the walls. Integrate the enthalpy.
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