[mrwts]

Hi guys!
I am new learner of FlUENT and UDF and I have been having some problems creating an energy source whose position changes respect to time. The coordinates of the energy source are saved in a extra text file. I have been looking for a while and I haven't found the mistake anywhere.
Trying to interpret the code I am getting the following mistake:

cpp -I"C:\PROGRA~1\ANSYSI~1\v150\fluent\fluent15.0.7/src" -I"C:\PROGRA~1\ANSYSI~1\v150\fluent\fluent15.0.7/cortex/src" -I"C:\PROGRA~1\ANSYSI~1\v150\fluent\fluent15.0.7/client/src" -I"C:\PROGRA~1\ANSYSI~1\v150\fluent\fluent15.0.7/multiport/src" -I. -DUDF
ONFIG_H="<udfconfig.h>" "C:\Users\Mendez\Desktop\energy source\Airfoil source - arrays with modulus.c"
Error: C:\\Users\\Mendez\\Desktop\\energy source\\Airfoil source - arrays with modulus.c: line 10: parse error.

I add the beginning of code so you can examine the part of the problem:

#include "udf.h"
#define V 1;
#define vel 2;
#define power 1000;
FILE *fp;
int i;
int j;

real a[1021][1021];
fp = fopen("values.txt","r");
for (i=0; i<1022; i++) {
for (j=0; j<1022; j++) {
fscanf(fp,"@d",&a[i][j]);
}
}
real t;
t = CURRENT_TIME; // line of the error
real s;
s = t*vel;

DEFINE_SOURCE(energ_source, cell, thread, dS, eqn)
{
real z[ND_ND];
real source;
real SOURCE_X_POSITION;
real SOURCE_Y_POSITION;
C_CENTROID(z,cell,thread);
...

Thanks in advance.

[upeksa]

You must declare the variables at the beginning of the code.

FILE *fp;
int i;
int j;
real t;
real a[1021][1021];
real s;

fp = fopen("values.txt","r");
for (i=0; i<1021; i++) {
for (j=0; j<1021; j++) {
fscanf(fp,"@d",&a[i][j]);
}
}

t = CURRENT_TIME;

s = t*vel;

You must use this code in a DEFINE_ON_DEMAND macro.

Check the size of the arrays.

That should be enough. Cheers.

[mrwts]

Thanks, It solved one of the problems. But, after declaring the variables at the beginning and adding the DEFINE_ON_COMAND marcro, an error comes up regarding two lines

DEFINE_SOURCE(energ_source, c, t, dS, eqn) // showing parse error and in the source line saying that the variable source hasn't been declared.

It seems really unusual for me, let me add the that part of the code so you can give your opinion.

DEFINE_SOURCE(energ_source,c,t,dS,eqn)
{
real source;
if (t_m % 2 != 0)
{
....

}
}

source = power/V;
dS[eqn] = 0;

return source;
}
}

I was thinking about the source name maybe, because the rest seems normal to me.
Should the name of the source,in my case energ_source, match with the names written in the macros DEFINE_SOURCE, DEFINE_ON_COMAND and the name of the UDF file?

Thanks again