[moji1366]

Dear My collegue
I wote a UDF for volumetric reaction but I cannot compile it before using the ANSYS FLUENT 14.5
I would be approciate every body that can help me.
The written program (rate.c) are as the following. Please write to me the response and send to "mojtaba.aslani66@gmail.com"

#include "udf.h"

#define R 8.314

DEFINE_VR_RATE(reaction,c,t,r,mw,species_massf,rat e,rr_t)
{
real n_CO2=species_massf[0]/mw[0];
real n_CO=species_massf[1]/mw[1];
real n_H2=species_massf[2]/mw[2];
real n_CH4=species_massf[3]/mw[3];
real n_N2=species_massf[4]/mw[4];
real n_H2O=species_massf[5]/mw[5];

real Total_n=(n_CO2+n_CO+n_H2+n_CH4+n_N2+n_H2O);

/*mole fraction*/
real mf_CO2=n_CO2/Total_n;
real mf_CO=n_CO/Total_n;
real mf_H2=n_H2/Total_n;
real mf_CH4=n_CH4/Total_n;
real mf_H2O=n_H2O/Total_n;

/*pressure*/
real P=C_P(c,t);

/*Temperature*/
real T=C_T(c,t);

/*Partial pressures*/
real P_CO2=mf_CO2*P;
real P_CO=mf_CO*P;
real P_H2=mf_H2*P;
real P_CH4=mf_CH4*P;
real P_H2O=mf_H2O*P;

/*Kinetic coefficient*/
real k_1=1.17e15*exp(-240100/(R*T));
real k_2=2.83e14*exp(-243900/(R*T));
real k_3=5.43e5*exp(-67130/(R*T));

/*Equilibrium constant*/
real K_CO=8.23e-5*exp(70650/T);
real K_H2=6.12e-9*exp(82900/T);
real K_H2O=1.77e5*exp(-88680/T);
real K_CH4=6.65e-4*exp(38280/T);

real Ke_1=exp((26830/T)+30114);
real Ke_2=exp((4400/T)+4.036);
real Ke_3=Ke_1*Ke_2;

/*Needed for calculations*/
real DEN=1+K_CO*P_CO+K_H2*P_H2+K_CH4*P_CH4+K_H2O*P_H2O/P_H2;

if (!strcmp(r->name, "reaction-1"))
{
*rate=2.2275*(k_1/pow(P_H2,2.5))*(P_CH4*P_H2O-pow(P_H2,3.5)*P_CO/Ke_1)/pow(DEN,2);
}

else if (!strcmp(r->name, "reaction-2"))
{
*rate=2.2275*(k_2/pow(P_H2,3.5))*(P_CH4*pow(P_H2O,2.5)-pow(P_H2,4)*P_CO2/Ke_3)/pow(DEN,2);
}

else if (!strcmp(r->name, "reaction-3"))
{
*rate=2.2275*(k_3/P_H2)*(P_CO*P_H2O-P_H2*P_CO2/Ke_2)/pow(DEN,2);
}

*rr_t=*rate;

}

[ho3ein.agl]

hi mojtaba.

Did you try this:
step1: uninstall visual studio express 2013 or 2010 or c++
step2: install Microsoft Visual Studio 2010 Ultimate v10.0 (or pro)

everything is fine
even dont need to start workbench or fluent from SDK

[mohsen.eng20]

hi friends
is u'r problem with compiling the udf or writing udf code?if that is compiling what is the error?

[WZX]

Hello,friend.My doctoral project is aslo about Steam Reforming by using CFD.
I also face the same problem. How did you solve it?