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Concentration in the first Cell near the wall

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Old   February 23, 2015, 12:23
Default Concentration in the first Cell near the wall
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miz
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Hi everyone,

I am using CFX-PRE to model an elbow, and i need to add a source term to this elbow. But it's depend on the concentration at the first cell near the wall.
How can i get this concentration in the cell near the wall so i can add my source term ?

Thanks for your answers
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Old   February 24, 2015, 02:02
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Is it a volume source term or a wall boundary source term?
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Old   February 24, 2015, 04:08
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it's a wall boundary source term
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Old   February 24, 2015, 05:12
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If you simply use the variable name it will give you the concentration at the first control volume. So if you want the average concentration at the control volume extending from the wall to half way to the first node you do not need to do anything special.

Or do you want the concentration from further in than the first control volume?
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Old   February 24, 2015, 05:18
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i have meshed my elbow, and i need to add a source term in a part of this elbow, this boundary source term is depending on the concentration of Oxygen near the wall.
but i don't know how can i get this concentration near the wall.

- have i to create a new variable named concentration then to create an expression

or i'm wrong and there's something easier
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Old   February 24, 2015, 05:49
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please help me ...
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Old   February 24, 2015, 06:27
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Have a look at the CFX documentation in the reference manual. It describes how to reference variables like concentration.
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