Fluent6: UDF: How to access mole fraction of species
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To access the mass fraction of a species, the macro C_YI(c,t,i) can be used. How could the mole fraction be accessed? The mole fraction of a species in a mixture can be calculated by - first summing up [mass fraction / molecular weight] of all species and - then dividing the same quotient for the individual species by the calculated sum. This is done automatically by the following function call (including variables and preparation): Material *mix_mat = mixture_material(Get_Domain(1)); Material *spe_mat = NULL; real all_mass_fracts[MAX_SPE_EQNS]; real all_mole_fracts[MAX_SPE_EQNS]; int i = -1; mixture_species_loop(mix_mat, spe_mat, i) { all_mass_fracts[i] = C_YI(c,t,i); } Mole_Fraction(mix_mat, all_mass_fracts, all_mole_fracts) After this, the mole fractions of all species can be found in the array "all_mole_fracts". |
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