Species Source Term

March 28, 2007, 12:24

Hi there,

I am currently modelling a reactive flow using the GRI 2.11 mechanism. Is there a possibilty to obtain the species production rate in a cell with a function like C_R(c,t) to obtain the density? I would be really glad, if you help me.

Greetings, Johannes.

March 28, 2007, 18:40

You can get the species concentration - see the UDF manual.

March 29, 2007, 19:58

Yeah, I know, but I need to get the source terms of the species concentration or something similar. :/

March 30, 2007, 18:46

For the GRI reaction rate, you would need to have the concentrations of the reactants either on a mass or mole basis. These can be converted using the fluid denisty and species molecular weights. Fluent has variables for the concentrations.

The source terms (for depletion of products, formation of reactants, energy, etc) are calculated from the concentrations, and specified reaction (i.e. GRI mechanism). I don't think the source terms are readily accessible, although you could write a UDF to do that.

Good luck.

March 28, 2007, 12:24	Species Source Term	#1
Johannes Guest Posts: n/a	Hi there, I am currently modelling a reactive flow using the GRI 2.11 mechanism. Is there a possibilty to obtain the species production rate in a cell with a function like C_R(c,t) to obtain the density? I would be really glad, if you help me. Greetings, Johannes.

March 28, 2007, 18:40	Re: Species Source Term	#2
Allan Walsh Guest Posts: n/a	You can get the species concentration - see the UDF manual.

March 29, 2007, 19:58	Re: Species Source Term	#3
Johannes Guest Posts: n/a	Yeah, I know, but I need to get the source terms of the species concentration or something similar. :/

March 30, 2007, 18:46	Re: Species Source Term	#4
Allan Walsh Guest Posts: n/a	For the GRI reaction rate, you would need to have the concentrations of the reactants either on a mass or mole basis. These can be converted using the fluid denisty and species molecular weights. Fluent has variables for the concentrations. The source terms (for depletion of products, formation of reactants, energy, etc) are calculated from the concentrations, and specified reaction (i.e. GRI mechanism). I don't think the source terms are readily accessible, although you could write a UDF to do that. Good luck.

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