Can not to interpret UDF
 

Hallo,

I have a problem with interpreting my UDF. The UDF defunes unsteady boundary conditions and looks as

#include "udf.h"

DEFINE_PROFILE(unsteady_mass_flow, thread, position)
{
double fact=1.E-06;
double S=1.5E-03;
double t, mass_flow;
face_t f;

t=RP_Get_Real("flow-time");
mass_flow=fact*57.6975*sin(6.2832*t);
begin_f_loop(f, thread)
{
F_PROFILE(f, thread, position)=mass_flow;
}
end_f_loop(f, thread)
}

Fluent reports the following error:

cpp -I"C:\Fluent.Inc\fluent6.3.26/src" -I"C:\Fluent.Inc\fluent6.3.26/cortex/src" -I"C:\Fluent.Inc\fluent6.3.26/client/src" -I"C:\Fluent.Inc\fluent6.3.26/multiport/src" -I. -DUDFCONFIG_H="<udfconfig.h>" "D:\Fluent data\Mask_test\Simulation\mfsin.c"
Error: D:\Fluent data\Mask_test\Simulation\mfsin.c: line 1: parse error.

What can it be??

Thank you.

i have interpreted it in my computer，no error。。。。。。。。。

First thing, it is better to compile it.
Second thing, use real in place of float and double.

There is no error with your UDF. Just use compiled one and it will work

What is an advantage to use real instead of double?

The problem with the UDF was that FLUENT could not read file from WordPad. After I had used Notepad++ everything was ok.

Thank you for your replies.

you should add the udfconfig.h in your working directory. The header file can be downloaded from internet.
Hope this helps you!