[AhmedM]

hello... if i have a volumtric reaction rate and want it to occur in a selected cell zone that have ID=8 is this code right or what i need to correct it...
please reply
//////////////////////////////////////////////////////////
#include "udf.h"
thread_loop_f(f_thread, domain)
{
if (THREAD_ID(f_thread) == 8)
{
DEFINE_VR_RATE(user_rate, c, t, r, mole_weight, species_mf, rr)
{
real temp=C_T(c,t);
real D=15.0/pow(9.0,((temp-100.0)/9.0));
real s1 = species_mf[0];
real mw1 = mole_weight[0];
*rr=(2.303/D)*s1*mw1;
}
}
}

[AlexanderZ]

#include "udf.h"
#include "math.h"

DEFINE_VR_RATE(user_rate, c, t, r, mole_weight, species_mf, rr)
{
real temp,D,s1,mw1;
temp=C_T(c,t);
if (THREAD_ID(t) == 8) 
{
D=15.0/pow(9.0,((temp-100.0)/9.0));
s1 = species_mf[0];
mw1 = mole_weight[0];
*rr=(2.303/D)*s1*mw1;
}
}

best regards