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Species concentration at the flow exit

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Old   May 22, 2005, 01:06
Default Species concentration at the flow exit
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Kavitha
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Hi, I do species conservation modeling in Fluent 6.2.

I write UDFs for each of these species using DEFINE_SOURCE macro which I hook to the sources in Fluid panel.

But when it comes to the fluid exit ( I assign a pressure-outlet at this boundary) Fluent asks me for species concentration at this boundary,which I dont know and expect Fluent to do it for me.Given that I know inlet species concentration, how should i overcome this?

Should I write a UDF using DEFINE_PROFILE macro that calculates the species concentration (using C_YI(c,t,i)) at this boundary? Will this work?

Please help,

Kavitha.
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Old   May 22, 2005, 03:31
Default Re: Species concentration at the flow exit
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yhpcgame
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I have the same question........
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Old   May 23, 2005, 23:15
Default Re: Species concentration at the flow exit
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kyung
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I get the same problem. How do I solve this? Can I use outflow? then what is the flow rate weighting gonna be?
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Old   May 24, 2005, 14:21
Default Re: Species concentration at the flow exit
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us
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No knowledge of perticular multispecies flow. However, would "OUTFLOW" boundary condition where you don't need to specify anything help? -US
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Old   May 26, 2005, 06:16
Default Re: Species concentration at the flow exit
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Shiju G,Thomas
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I think fluent asks only for backflow species concentration on a pressure outlet.I have not yet used Fluent 6.2 but have used 6.1.
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Old   May 28, 2005, 07:24
Default Re: Species concentration at the flow exit
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SIVAKUMAR
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Hai,

please give me some idea to write udf for combustion of solid fuel. bcz i'm struggling with this problem.

help me please.

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