Concentration in the first Cell near the wall

miz_miz · February 23, 2015, 11:23

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

ghorrocks · February 24, 2015, 01:02

Is it a volume source term or a wall boundary source term?

miz_miz · February 24, 2015, 03:08

it's a wall boundary source term

ghorrocks · February 24, 2015, 04:12

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?

miz_miz · February 24, 2015, 04:18

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

miz_miz · February 24, 2015, 04:49

please help me ...

ghorrocks · February 24, 2015, 05:27

Have a look at the CFX documentation in the reference manual. It describes how to reference variables like concentration.

February 23, 2015, 11:23	Concentration in the first Cell near the wall	#1
miz_miz 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, 01:02		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	Is it a volume source term or a wall boundary source term?

February 24, 2015, 03:08		#3
miz_miz New Member miz Join Date: Feb 2015 Posts: 23 Rep Power: 11	it's a wall boundary source term

February 24, 2015, 04:12		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	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?

February 24, 2015, 04:18		#5
miz_miz 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

February 24, 2015, 04:49		#6
miz_miz New Member miz Join Date: Feb 2015 Posts: 23 Rep Power: 11	please help me ...

February 24, 2015, 05:27		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,697 Rep Power: 143	Have a look at the CFX documentation in the reference manual. It describes how to reference variables like concentration.