[cpassa]

Hello everybody,

I want to plot contours of a custom surface reaction rate introduced through a UDF. I know it should be done using defined memory, F_UDMI. I have tried some modifications of the udf routine, still unseccessfully. Can anybody help me on this issue? Thanks!
Below is my UDF:

#include "udf.h"
/************************************************** *********
Custom surface reaction rate UDF
************************************************** **********/
/* CONSTANTS en MKS */
#define LP1 8.4e-5
#define KF 7.e+6
#define densi 1.19

/* Species numbers. Must match order in Fluent panel */
#define ACE 0
#define MET 1
#define NUM_SPECS 3

/* Superficial Reaction (kmol/(m2*s)) */
DEFINE_SR_RATE(my_rate,f,t,r,mw,yi,rr)
{
real ConACE = 1.;
real r1;
ConACE = densi*yi[ACE]/mw[ACE];
r1 =LP1*ConACE/(1.7+KF*ConACE);
*rr = r1;
}

[chinu007]

Hi Cpassa,
Did you resolve this issue.
If yes then I would like to know how you had done done it.
Looking for your quick response.
Thanks in advance

[pakk]

Cpassa said how to do it: use a UDM. Unfortunately, their UDF does not use any UDM, so we don't know what they tried, and how they failed.

I suggest you do it better: add a UDM to this code, compile it, use it, and share your result (or where it went wrong). It's much easier to help if we can see where it went wrong.