CFD Online Discussion Forums - Eagerly need your help, please

Hi, everyone.

I want to know who has experience in using macro DEFINE_HET_RXN_RATE( name,c,t,r,mw,yi,rr,rr_t)?

I have such a problem: In the help document of FLUENT, the illustration of variables mw[][] and yi[][] confused me.

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real mw[MAX_PHASES][MAX_SPE_EQNS]        Matrix of species molecular weights.

         mw[i][j] will give molecular weight of

         species with ID j in phase with index i.

         For phase which has fluid material, the

         molecular weight can be accessed as

         mw[i][0].

real yi[MAX_PHASES][MAX_SPE_EQNS]        Matrix of species mass fractions.

         yi[i][j] will give mass fraction of

         species with ID j in phase with index i.

         For phase which has fluid material,

         yi[i][0] will be 1.

So the question is how do we know i and j? Do they depend on the settings in FLUNENT?

An example is shown in help which is about simulating evaporation or condensation on the surface of droplets and there are such two sentences

Quote:

#define index_evap_primary 0 /*evaporating species index in primary phase*/
#define prim_index 0 /*index of primary phase*/

I want to know, how can we get the index of primary phase and evaporating species. Is dependent on the order of mixture setting and phase setting?
You all know, in mixture setting, we can arrange the order of species. Default id for the first specie is 0, but for phase setting, primary phase id obviously is not 0 but 2. So I am confused about. I hope someone can help me.