[Gimlas]

dear colleagues
I have a basic issue with udfs dedicated to the breakage frequency in the Population Balance Equations. I have created a very simple code:

#include "udf.h."
#include "sg_pb.h"
#include "sg_mphase.h"

DEFINE_PB_BREAKUP_RATE_FREQ(break_up_freq_pow, cell, thread_1, d_1)
{
real f1;
real kv = M_PI/6.;
real C1 = 150000.;
real V_prime = kv*pow(d_1,3.);

f1 = pow(V_prime,1./3.);
return C1*f1;
};





But it generates the following error message:

************************************************** **************************

************************************************** **************************

** WARNING: Automatically switched to run in parallel -t1 mode. **

** Detected non-parallelized UDF usage, enabling parallel usage. **

** If you encounter any issues, please re-run with -t0 flag. **

************************************************** **************************

************************************************** **************************Creating user_nt.udf file for 3ddp_host ...

(system "copy "C:\PROGRA~1\ANSYSI~1\v193\fluent"\fluent19.3.0\sr c\udf\makefile_nt.udf "libudf\win64\3ddp_host\makefile" ")

1 file(s) copied.

(chdir "libudf")(chdir "win64\3ddp_host")# Generating ud_io1.h

BRK.c

# Generating udf_names.c because of makefile BRK.obj

udf_names.c

udf_names.c(8): error C2065: "break_up_freq_pow": niezadeklarowany identyfikator (undeclared identifier)

udf_names.c(8): warning C4312: "typ rzutowania": konwersja z "int" na "void (*)(void)" jest wi�kszej wielko�ci ("cast type": conversion of "int" into "void(*)(void)" is higher value)

udf_names.c(8): error C2065: "UDF_TYPE_PB_BREAKUP_RATE_FREQ": niezadeklarowany identyfikator (undecllared identifier)

udf_names.c(8): error C2099: inicjator nie jest sta�� (initiator is not ...)


************************************************** **************************

************************************************** **************************

** WARNING: Automatically switched to run in parallel -t1 mode. **

** Detected non-parallelized UDF usage, enabling parallel usage. **

** If you encounter any issues, please re-run with -t0 flag. **

************************************************** **************************

************************************************** **************************Creating user_nt.udf file for 3ddp_node ...

(system "copy "C:\PROGRA~1\ANSYSI~1\v193\fluent"\fluent19.3.0\sr c\udf\makefile_nt.udf "libudf\win64\3ddp_node\makefile" ")

1 file(s) copied.

(chdir "libudf")(chdir "win64\3ddp_node")# Generating ud_io1.h

BRK.c

# Generating udf_names.c because of makefile BRK.obj

udf_names.c

udf_names.c(8): error C2065: "break_up_freq_pow": niezadeklarowany identyfikator

udf_names.c(8): warning C4312: "typ rzutowania": konwersja z "int" na "void (*)(void)" jest wi�kszej wielko�ci

udf_names.c(8): error C2065: "UDF_TYPE_PB_BREAKUP_RATE_FREQ": niezadeklarowany identyfikator

udf_names.c(8): error C2099: inicjator nie jest sta��


Done.



So I have decided to run the example given in the Fluent's manual:

#include "udf.h"
#include "sg_pb.h"
#include "sg_mphase.h"

DEFINE_PB_BREAKUP_RATE_FREQ(break_up_freq_tav, cell, thread, d_1)
{
real epsi, alpha, f1, f2, rho_d;
real C1 = 0.00481, C2 = 0.08, sigma = 0.07;
Thread *tm = THREAD_SUPER_THREAD(thread);/*passed thread is phase*/
epsi = C_D(cell, tm);
alpha = C_VOF(cell, thread);
rho_d = C_R(cell, thread);
f1 = pow(epsi, 1./3.)/((1.+epsi)*pow(d_1, 2./3.));
f2 = -(C2*sigma*(1.+epsi)*(1.+epsi))/(rho_d*pow(epsi,2./3.)*pow(d_1, 5./3.));
return C1*f1*exp(f2);
}

But it generates even more errors... I am working on Ansys Fluent 2019R1 version of the software.

I would be obliged if you could help me.

Best regards

[vinerm]

The problem appears to be that you copied the code from the manual and modified it. You have to open a new file, write the code yourself, and then compile it.