udf source
 

Hello,

I have a question and I will like if anyone can help me to write the following DEFINE_SOURCE:
I inform you that the values of T_mean and Time is in a txt file named result.txt.

I want to write an udf program that uses the found values of the text file.
I ran the progame and I did not find any errors but the program does not give me the values of
T_mean and Time. Help me please.


DEFINE_SOURCE(Source_AIR, c, t, dS, eqn)
{
real source, Time,T_mean;
FILE *pFile;
pFile=fopen("c:/result.txt","r");
fscanf(pFile,"%g %g\n",&Time,&T_mean);
fclose(pFile);
source =32*T_mean*Time;
dS[eqn] = 0.0;
return source;
}

-You don't give any value to T_mean

-Also this equation is odd:
TEMP=T_Mean;
source =32*T_Mean*TEMP/TIM;

T_mean*TEMP is the same as T_mean^2
Why do you even need the TEMP?

-You have not defined the T_Moyenne inside the DEFINE_SOURCE.

-You should remove the semicolon ';' from inside of fscanf(pFile,"%g ;%g\n" and fprintf(pFile,"%g ;%g\n"

-fscanf( is missing the last bracket ')'

thank you for your replay

For this Source term, I want open file text (in mu case result.txt), in this file they have a value, for exemple 30 299. (30 is 30 sec, and 299 is temperature).

for DEFINE SOURCE, I want open result.txt and read 30 as time and 299 as temperture.

Tahnk you.

DEFINE_SOURCE(Source_AIR, c, t, dS, eqn)
{
real source, Time,T_mean;
FILE *pFile;
pFile=fopen("c:/result.txt","r");
fscanf(pFile,"%g %g\n",&Time,&T_mean);
fclose(pFile);
source =32*T_mean*Time;
dS[eqn] = 0.0;
return source;
}

still:

-fscanf( is missing the last bracket ')'
-T_Moyenne
-are you sure about that source-equation?

My problem is not in the equation or in the bracket (. but how can I read a file txt and load some variables (Time and Time) in the DEFINE SOURCE

Your problem was also the bracket. UDF do not work, if the code is wrong.

Do you need the "\n" when using fscanf();?

You could also try %f in your fscanf(); or are you using double precision?

not necessery to put \n or double double precision, I want juste read a text file
and calculate source =32*T_mean*Time. the values of Time and T_mean finded in the file text.

I want to have any solution to read these two values from a text file.