How to evacuate only species on the outlet

asal · December 13, 2014, 04:13

Hello!

I have a case in fluent that I try to simulate contaminant with the species transport. I am wondering, if it is possible to filter the species over the outlets and evacuate them without evacuating the air?
Thanks.

LuckyTran · December 13, 2014, 11:07

I think yes. You can set permeability for different species. This should let you make the outlet permeable to your contaminate and impermeable to air.

asal · December 14, 2014, 05:58

Hello and thanks for your reply.

Would you please explain more. As far as I know, we can set the percentage of the species for the backflow over the outlets!

macfly · December 14, 2014, 12:29

I think you have to set up the species transport with user-defined scalars instead of using the species transport model. When you model species transport through user-defined scalars you get to specify a scalar value or a scalar flux at outlets.

See the attached picture, user scalar 0 would have a specified value = 0 at the outlet while user scalars 1, 2 and 3 would have a typical convective and/or diffusive flux specified at the outlet.

Look for the tutorial Using User Defined Function (UDF) with ANSYS FLUENT Tutorials : UDFs for a User Defined Scalar on the Ansys customer portal to learn how to set up species transport with user-defined scalars.

December 13, 2014, 04:13	How to evacuate only species on the outlet	#1
asal Senior Member Astio Lamar Join Date: May 2012 Location: Pipe Posts: 186 Rep Power: 13	Hello! I have a case in fluent that I try to simulate contaminant with the species transport. I am wondering, if it is possible to filter the species over the outlets and evacuate them without evacuating the air? Thanks.

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December 13, 2014, 11:07		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	I think yes. You can set permeability for different species. This should let you make the outlet permeable to your contaminate and impermeable to air.

December 14, 2014, 05:58		#3
asal Senior Member Astio Lamar Join Date: May 2012 Location: Pipe Posts: 186 Rep Power: 13	Hello and thanks for your reply. Would you please explain more. As far as I know, we can set the percentage of the species for the backflow over the outlets!