# Species Concentration

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 September 18, 2001, 09:07 Species Concentration #1 Michal Guest   Posts: n/a Sponsored Links Hi, Is it possible to obtain a concentration of species directly from a solver for a UDF purposes? Michal

 September 18, 2001, 17:16 Re: Species Concentration #2 KT Guest   Posts: n/a Yes, you can use C_YI(c,t,i), where c is the cell, t is the thread, and i the species index.

 September 19, 2001, 01:48 Re: Species Concentration #3 Michal Guest   Posts: n/a Thanks for Your response! One mor question: How to check which species index "i" describe particular species? Michal

 September 20, 2001, 14:40 Re: Species Concentration #4 KT Guest   Posts: n/a It usually corresponds to the species list in the material panel starting with 0.

 September 24, 2001, 02:48 Re: Species Concentration #5 Greg Perkins Guest   Posts: n/a Note C_YI returns the species mass fraction not concentration. You will need to convert to get concentration. Greg

 September 25, 2001, 02:32 Re: Species Concentration #6 Michal Guest   Posts: n/a 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)?

 September 25, 2001, 03:45 Re: Species Concentration #7 Greg Perkins Guest   Posts: n/a 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

 September 25, 2001, 03:52 Re: Species Concentration #8 Michal Guest   Posts: n/a Thanks for Your very helpful answer! Now it is clear... Michal

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