A.2 Usage

DEFINE_HET_RXN_RATE( name,c,t,r,mw,yi,rr,rr_t)

Argument Type	Description
char name	UDF name.
cell_t c	Cell index.
Thread *t	Cell thread (mixture level) on which
	heterogeneous reaction rate is to be applied.
Hetero_Reaction *r	Pointer to data structure that represents
	the current heterogeneous reaction
	(see sg_mphase.h).
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 molecular weight of
	species with ID j in phase with index i.
	For phase which has fluid material,
	yi[i][0] will be 1.
real *rr	Pointer to laminar reaction rate.
real *rr_t	Currently not used. Provided for future use.
Function returns
void

There are eight arguments to DEFINE_HET_RXN_RATE: name, c, t, r, mw, yi, rr, and rr_t. You will supply name, the name of the UDF. c, t, r, mw, yi, rr, and rr_t are variables that are passed by the ANSYS FLUENT solver to your UDF. Your UDF will need to set the values referenced by the real pointer rr.