[Griffinus]

Hi,

I am trying to run a very simple udf in fluent. The udf actually makes a sinusoidal velocity with time at the inlet and as for the outlet, the gauge pressure is 0. The geometry is simple rectangular channel. When I tried to interpret the udf in my pc, no error was shown, and I was able to compile the udf as well in my pc. There was no error.

However, when I tried to interpret the udf (.c) file in the HPC, it was showing line 1 syntax error like the following:

cpp: error trying to exec 'cc1': execvp: No such file or directory Error: "/storage/coda1/p-skumar61/0/proy62/udf/unsteady_test.c": line 1: syntax error. cpp: error trying to exec 'cc1': execvp: No such file or directory Error: "/storage/coda1/p-skumar61/0/proy62/udf/unsteady_test.c": line 1: syntax error.

Can anyone help me in understanding what the problem is? i am providing the udf code below for reference:

code:

#include "udf.h"

DEFINE_PROFILE(unsteady_velocity, thread, position)
{

face_t f;

real t = CURRENT_TIME;


begin_f_loop(f, thread)

{

F_PROFILE(f, thread, position) = 15.0 * sin(10.*t);


}

end_f_loop(f, thread)

}

[rewol]

Looks like it looks for a file but cant find it.
Here is what i do when i need a UDF in HPC environment:

1. Start a new case in local pc.
2. Compile my udf and make sure libudf folder is created.
3. Save the case with compiled udf.
4. Copy the case and libudf to same directory in HPC along with my udf file (Ex: MYUDF.C)
5. Create the case and load UDF through journal (not compile)
6. Run the case.

[Griffinus]

Hi,

Thank you for your advice. I tried to compile it, and it is now running well. But I am facing the same issue if I try to interpret a udf in the HPC. Do you know the reason behind that?

[rewol]

Hello,

Sorry but nothing comes to mind. But if compiling works, why would you use interpret? As far as i remember, you dont even need an external compiler with latest fluent versions, since it was built-in.

Best,

Refik

[Griffinus]

Hi Refik,

Thank you for the advice. It helped a lot.