[amilachandra]

I want to write UDF for solid decomposition reaction. As simple startup, I replicate the normal particle surface reaction with UDF as bellow code. I generated 3 cases
Case1- No UDF and used reaction panel already available in ANSYS’s .
Case2- With following UDF with single core for CFD simulation running.
Csae3- With following UDF with four cores for CFD simulation running.

#include "udf.h"

#define A2 2e+07 /*solid decompostion pre-exponential factor*/
#define E2 3e+08 /*solid decompostion activation energy*/
#define RGASU UNIVERSAL_GAS_CONSTANT /*Universal gas conatanat (J/(kmolK))*/
DEFINE_PR_RATE(user_rate, c, t, r, mw, ci, tp, sf, dif_i, cat_i, rr)
{

/*solid decompostion*//* */
if (!strcmp(r->name, "reaction-1"))
{
real Tg= C_T(c,t);
real Tp= TP_T(tp);

real Drate=TP_DIAM (tp)*TP_DIAM (tp)*M_PI*sf[1]*A2*exp(-E2/RGASU/Tp);

*rr=-Drate;

}
}

All the cases give the same result. I want to further clarify Is this correct? (because I did not use any additional coding for the case 3)

[amilachandra]

Dear All,
After reading other posts, I have understood that it is not necessary to change the serial UDF if it is used only for the parameters and properties of a particular cell, such as my one. Is this true?