[M.Meh]

I have a domain consisting of 8 point (node). I want to read a txt file for each point and import them as source term for x momentum source. My UDF form for read text is as


#include "udf.h"
#include <math.h>
float x[9],y[9],fx[9];
DEFINE_ON_DEMAND(read_data)
{
FILE *rfile;
int i;
rfile = fopen("newdata.txt","r");
for (i=1;i<9;i++)
{
fscanf(rfile,"%f",&x[i]);
fscanf(rfile,"%f",&y[i]);
fscanf(rfile,"%f",&fx[i]);
}
fclose(rfile);

}

and My text file as
((inlet point 8)
(x
0.0
0.001
0.002
0.003
0.0
0.001
0.002
0.003
)
(y
0.0
0.0
0.0
0.0
0.001
0.001
0.001
0.001
)
(fx
-1.019200000*10^6
-1.019200000*10^6
-1.019200000*10^6
-1.019200000*10^6
-1.019200000*10^6
-1.019200000*10^6
-1.019200000*10^6
-1.019200000*10^6
)
)
(for simplicity I use a value for all points as source).
Now, I have two problems:
1. Above UDF compiling give an error

E:\program\visual studio\VC\include\math.h(482) : error C2059: syntax error : ','
E:\program\visual studio\VC\include\math.h(482) : error C2143: syntax error : missing ')' before 'constant'
E:\program\visual studio\VC\include\math.h(482) : error C2143: syntax error : missing '{' before 'constant'
E:\program\visual studio\VC\include\math.h(482) : error C2059: syntax error : 'constant'
E:\program\visual studio\VC\include\math.h(482) : error C2059: syntax error : ')'
..\..\src\ReadText.c(7) : warning C4129: 'Y' : unrecognized character escape sequence
..\..\src\ReadText.c(7) : warning C4129: 'D' : unrecognized character escape sequence
..\..\src\ReadText.c(7) : warning C4129: 'S' : unrecognized character escape sequence

Done.

2. I dont know how write a UDF for use each fx as x momentum source?

Please help me.

[CeesH]

well, the error seems to be in math.h.
I recall FLUENT has some issues using the <> notation for headers. What if you replace it by "math.h"

[M.Meh]

Thank you for your answer.
I replace " " in my UDF but I have previous error, aslo.

[pakk]

Have you previously compiled udfs, or is this the first time that you try?

[M.Meh]

Hi
Thank you for your answer.
This is first time I compile a udf file. I have firstly "nmake" error and then "x copy".
After search in cfd-online, and use from it, I could eliminate these errors according to some comments.
Now I have this error mentioned.
Please help me.

[pakk]

One thing you can do is to remove the math.h line, I don't think you need it at all.

I see "Visual Studio" in your folder name. Are you aware that you should compile the udf in the program Fluent?

[M.Meh]

Originally Posted by pakk

One thing you can do is to remove the math.h line, I don't think you need it at all.

I see "Visual Studio" in your folder name. Are you aware that you should compile the udf in the program Fluent?

Hello,
I remove the math.h line but I have previous error.
I wane compile the udf by Fluent program as
Define---> user defined---> functions---> compiled.
This is a part of my project namely I want read a data file and use them as source for momentum. Please guide me.
Thank you.

[pakk]

So you don't include math.h anymore, but Fluent still gives an error message about math.h? Strange.
Are you sure that you are changing the correct file?

[M.Meh]

Originally Posted by pakk

So you don't include math.h anymore, but Fluent still gives an error message about math.h? Strange.
Are you sure that you are changing the correct file?

Yes, fluent still give an error message about math.h.
I think maybe my text file for reading is wrong, How to make a text file for this problem? with which format? text? dat? or ...
Do I write data as row or column?
Do I write only source values or both source value and coordinate point? Please help me.
What do you mean from changing the file? I don't understand?

thank you.