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15.9.1 Setting Boundary Stream Species

In combustion, a large number of intermediate and product species may be produced from a small number of initial boundary species. In FLUENT you need to input only the species composition of your boundary species in the fuel, oxidizer, and (if appropriate) secondary streams. FLUENT will calculate all intermediate and product species automatically. The following suggestions may be helpful in the definition of the system chemistry:



Including Condensed Species


In addition to gaseous species, liquid and solid species can be included in the chemistry calculations. They are often indicated by an "l'' or an "s'' in parentheses after the species name. If you add a condensed species to the equilibrium chemical system, its density will be retrieved from FLUENT's chemical property database file propdb.scm if you are using the thermodynamic database file thermo.db that is also supplied with FLUENT. If you are using a custom thermodynamic database file and want to include a condensed species in the equilibrium system that does not exist in propdb.scm, a density of 1000 kg/m $3$ will be assumed. The condensed species density can be changed in the Materials panel after the PDF table has been calculated. If you modify the condensed species density in this manner, you will then need to recalculate the PDF table.


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