Error in compiling a Volume Reaction Rate UDF
 

Hi everyone,

I have tried to compile a UDF that I have written for a specific volume reaction rate for enzyme inactivation in foods.

I don't know why, but Fluent suddenly stops after I push the button "build" in the panel.

I also tried to interpret the UDF, instead of compile it, but in this case, the following message appears on the screen: "Error: ... line 17: structure reference not implemented". I can't see the error in the source file.

I would be glad if someone could give some tips to solve my problem. The UDF is presented below:

#include "udf.h"

#define DREF1 2.184e3
#define DREF2 7.353e1
#define AA 7.796e-1
#define Z1 4.63
#define Z2 1.0e2
#define TREF 3.5315e2

DEFINE_VR_RATE(user_rate, c, t, r, mole_weight, species_mf, rr)
{
real temper=C_T(c,t);
real D1 = DREF1*pow(10.0,((TREF-temper)/Z1));
real D2 = DREF2*pow(10.0,((TREF-temper)/Z2));
real s1 = species_mf[0];
real mw1 = mole_weight[0];
if(STREQ(r->name,"reaction-1")){
*rr=-AA*(2.3026/D1)*s1/mw1-(1-AA)*(2.3026/D2)*s1/mw1;
}
}

Your line
has seven arguments.
In the Fluent help:

Quote:

DEFINE_VR_RATE (name,c,t,r,mw,yi,rr,rr_t)

has eight arguments.
So you missed something in your definition of your udf...

Thanks for your reply!

I think this is not the problem. The last argument in the macro is "rr_t", which is used for turbulent reaction flow, I guess! And this is not the case.

I think it has to to with "STREQ", but I have seen many examples of this, and I could not figure out what is wrong.

Now, I try to compile it, and some "nmake" error appears...

While it might not cause your current problem, it is wrong, and you should fix it. Just add another argument...


I tried to compile your UDF, and it worked perfectly.


Do you have this problem only with this UDF, or with all UDfs that you try to compile?

I tried with another UDF but the same happened again. What is the Fluent and Visual Studio version that you use?