[rsmisal]

#include "udf.h"
#define rho_ref 1001
#define T_ref 313
#define YI_ref 0.99
DEFINE_PROPERTY(boussinesq_density, c, t)
{
real rho; int i;
real T,YI,dT ,dYI;
real T_operating,YI_operating;
T_operating = RP_Get_Real ("operating-temperature");
T = C_T(c,t) + T_operating;
dT = T-T_ref;
YI_operating = RP_Get_Real ("operating-species mass fraction");
YI = C_YI(c,t,i) + YI_operating;
dYI = YI-YI_ref;
rho = rho_ref * (1- 0.0005644 * dT - 0.9297 *dYI);
return rho;
}
But above program shows error mass fraction in not defined ..........plzzz help!!!!!!