UDF in parallel (fscanf)
 

Hello,

I have a UDF that's using an fscanf function to scan a file with point coordinates. Everything works great in Serial, but when simulating in parallel (even with only 1 processor), specifically the fscanf function is causing the following error output:

0 (..\src\mpsystem.c@1173): mpt_read: failed: errno = 10054

0: mpt_read: error: read failed trying to read 4 bytes: No such file or directory
MPI Application rank 0 exited before MPI_Finalize() with status -1
The Parallel FLUENT process could not be started.

The function is being executed by the host.

Has anyone seen this?

Thanks,

Vitaly

Dear Vitaly,

If you solved your problem can you please let me know how, as I have similar error with fscanf

Many thanks,
GI

Hi GI,

To be honest, I don't remember exactly what I did. Looking at my code, I the format looks like this:

DEFINE_ON_DEMAND(func)
{
real input[N];

cfPtr = fopen("finle_name.txt", "r");
for (i = 0; i<N; i++)
{
fscanf(cfPtr,"&lf",&input[i];
}

}

To be honest, I have not looked at this code in a while and don't currently have Fluent installed to check it. In fact, I found it on an old printout that I had in my desk. Nevertheless, I think it worked for me.
I should say that I would get very frustrated with Fluent compiler. Even when I took a UDF class at ANSYS, the instructor was getting frustrated also because simple function would not work. Sometimes I would try the exact same UDF on a different computer in my lab (with Fluent) and it would work with no problem!

I know this is not an ideal explanation, but I hope it helps!

Good luck!

-Vitaly