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Species Concentration

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Old   September 18, 2001, 10:07
Default Species Concentration
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Michal
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Hi,

Is it possible to obtain a concentration of species directly from a solver for a UDF purposes?

Michal
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Old   September 18, 2001, 18:16
Default Re: Species Concentration
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KT
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Yes, you can use C_YI(c,t,i), where c is the cell, t is the thread, and i the species index.
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Old   September 19, 2001, 02:48
Default Re: Species Concentration
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Michal
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Thanks for Your response! One mor question: How to check which species index "i" describe particular species? Michal
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Old   September 20, 2001, 15:40
Default Re: Species Concentration
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KT
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It usually corresponds to the species list in the material panel starting with 0.
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Old   September 24, 2001, 03:48
Default Re: Species Concentration
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Greg Perkins
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Note C_YI returns the species mass fraction not concentration. You will need to convert to get concentration.

Greg
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Old   September 25, 2001, 03:32
Default Re: Species Concentration
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Michal
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Thanks for Your advices!

Another question: How to get a mixture density for UDF directly from a solver? Is it correctly to obtain this value simply by C_R(c,t)?
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Old   September 25, 2001, 04:45
Default Re: Species Concentration
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Greg Perkins
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Yes

so a species concentration is

CONC_i = C_YI(c,t,i)*C_R(c,t)/Mi

where Mi = molecular weight g/mol = kg/kmol of species i

Greg
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Old   September 25, 2001, 04:52
Default Re: Species Concentration
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Michal
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Thanks for Your very helpful answer! Now it is clear...

Michal
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