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Concentration in the first Cell near the wall |
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February 23, 2015, 12:23 |
Concentration in the first Cell near the wall
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#1 |
New Member
miz
Join Date: Feb 2015
Posts: 23
Rep Power: 11 |
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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February 24, 2015, 02:02 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,872
Rep Power: 144 |
Is it a volume source term or a wall boundary source term?
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February 24, 2015, 04:08 |
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#3 |
New Member
miz
Join Date: Feb 2015
Posts: 23
Rep Power: 11 |
it's a wall boundary source term
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February 24, 2015, 05:12 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,872
Rep Power: 144 |
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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February 24, 2015, 05:18 |
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#5 |
New Member
miz
Join Date: Feb 2015
Posts: 23
Rep Power: 11 |
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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February 24, 2015, 05:49 |
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#6 |
New Member
miz
Join Date: Feb 2015
Posts: 23
Rep Power: 11 |
please help me ...
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February 24, 2015, 06:27 |
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#7 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,872
Rep Power: 144 |
Have a look at the CFX documentation in the reference manual. It describes how to reference variables like concentration.
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