[Arjunsajith]

I am working with ANSYS Fluent 19.2 and VS2017 and when I try to build & load my UDF i get the following error:
The UDF library you are trying to load (libudf) is not compiled for 3d on the current platform (win64).
The system cannot find the file specified.
I found that when building the UDF it does not seem to complete the process. The message is as follows:
Error: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64).\n\nThe system cannot find the file specified.
\n\nC:\Users\theki\Desktop\ansys\pcm_files\dp0\FFF \Fluent\libudf\win64\3d_host\libudf.dll
Error Object: #f

I started Fluent in serial as well as parallel mode. Error exists in both mode.
Anyone got a clue what the problem might be?


Thanks in advance

Arjun

[pakk]

Yes, you probably missed an error during compiling. Check my signature.

[Arjunsajith]

Copied C:\Users heki\Desktop\ansys\pcm_files\dp0\FFF\Fluent rail.c to libudf\src
Creating user_nt.udf file for 3d_host ...
(system "copy "C:\PROGRA~1\ANSYSI~1\v192\fluent"\fluent19.2.0\sr c\udf\makefile_nt.udf "libudf\win64\3d_host\makefile" ")
1 file(s) copied.
(chdir "libudf")(chdir "win64\3d_host")# Generating ud_io1.h
trail.c
C:\PROGRA~1\ANSYSI~1\v192\fluent\fluent19.2.0\src\ main\global.h(9): fatal error C1083: Cannot open include file: 'stdio.h': No such file or directory
Creating user_nt.udf file for 3d_node ...
(system "copy "C:\PROGRA~1\ANSYSI~1\v192\fluent"\fluent19.2.0\sr c\udf\makefile_nt.udf "libudf\win64\3d_node\makefile" ")
1 file(s) copied.
(chdir "libudf")(chdir "win64\3d_node")# Generating ud_io1.h
trail.c
C:\PROGRA~1\ANSYSI~1\v192\fluent\fluent19.2.0\src\ main\global.h(9): fatal error C1083: Cannot open include file: 'stdio.h': No such file or directory

Done.



This is the error while building.

How do i deal with this error .

Thanks in advance

Arjun

[pakk]

Read it.

It says there is a problem on line 9. You try to include stdio.h, but that file does not exist.

Why do you include that file? You don't need that in Fluent UDFs...

[Arjunsajith]

This is the code i have used for the UDF . I have not given stdio.h command but still it is having this error.


#include "udf.h"

DEFINE_PROPERTY(PCM_density,cell,thread)
{

real tempe2,r;
#if !RP_HOST
tempe2 = C_T(cell,thread);
if (tempe2 <= 298.6)
r=785;
else if ((tempe2 > 298.6) && (tempe2 < 300.6))
{

r=785-(36*(tempe2-298.6)/2);
}

else if (tempe2 >= 300.6)
{
r=749*(1-0.001*(tempe2-300.6));
}
#endif
return r;

}

DEFINE_PROPERTY(PCM_Dynamicviscosity,cell,thread)
{
real tempe2,mu;
#if !RP_HOST
tempe2 = C_T(cell,thread);
if (tempe2 <= 298.6)
mu=1;
else if ((tempe2 > 298.6) && (tempe2 <= 300.5))
mu=(300.6-tempe2)/2;
else if ((tempe2 > 300.5) && (tempe2 <= 300.6))
mu=(300.6035-tempe2)/2.07;
else if (tempe2 > 300.6)
mu=0.00169;
#endif
return mu;
}

DEFINE_PROPERTY(PCM_thermalconductivity,cell,threa d)
{
real tempe2,k;
#if !RP_HOST
tempe2 = C_T(cell,thread);
if (tempe2 <= 298.6)
k=0.19;
if ((tempe2 > 298.6) && (tempe2 < 300.6))
{
k=0.19-(0.01*(tempe2-298.6)/2;
}
else
{
k=0.18;
}
#endif
return k;
}

DEFINE_SPECIFIC_HEAT(PCM_specificheat, T, Tref, h, yi)
{
real cp,dnum;
#if !RP_HOST
if (T <= 298.6)
cp=1800;
if ((T > 298.6) && (T < 300.6))
{
cp=1800+(600*(T-298.6)/2);
}
else
{
cp=2400;
}
*h=cp;
#endif
return cp;
}

[pakk]

O, I see. I'm sorry, I did not look good enough, the error is in global.h, not in your code.

I guess that you have never compiled before with this installation? If so, it's good to mention that next time.

The problem is in the compiler installation (VS2017): it looks like not all files are included, or they are not configured good. This has nothing to do with your code.

The bad news: I have no idea how to fix this. Reinstall is the only thing I can think of.

[Parvaneh]

Originally Posted by Arjunsajith

This is the code i have used for the UDF . I have not given stdio.h command but still it is having this error.


#include "udf.h"

DEFINE_PROPERTY(PCM_density,cell,thread)
{

real tempe2,r;
#if !RP_HOST
tempe2 = C_T(cell,thread);
if (tempe2 <= 298.6)
r=785;
else if ((tempe2 > 298.6) && (tempe2 < 300.6))
{

r=785-(36*(tempe2-298.6)/2);
}

else if (tempe2 >= 300.6)
{
r=749*(1-0.001*(tempe2-300.6));
}
#endif
return r;

}

DEFINE_PROPERTY(PCM_Dynamicviscosity,cell,thread)
{
real tempe2,mu;
#if !RP_HOST
tempe2 = C_T(cell,thread);
if (tempe2 <= 298.6)
mu=1;
else if ((tempe2 > 298.6) && (tempe2 <= 300.5))
mu=(300.6-tempe2)/2;
else if ((tempe2 > 300.5) && (tempe2 <= 300.6))
mu=(300.6035-tempe2)/2.07;
else if (tempe2 > 300.6)
mu=0.00169;
#endif
return mu;
}

DEFINE_PROPERTY(PCM_thermalconductivity,cell,threa d)
{
real tempe2,k;
#if !RP_HOST
tempe2 = C_T(cell,thread);
if (tempe2 <= 298.6)
k=0.19;
if ((tempe2 > 298.6) && (tempe2 < 300.6))
{
k=0.19-(0.01*(tempe2-298.6)/2;
}
else
{
k=0.18;
}
#endif
return k;
}

DEFINE_SPECIFIC_HEAT(PCM_specificheat, T, Tref, h, yi)
{
real cp,dnum;
#if !RP_HOST
if (T <= 298.6)
cp=1800;
if ((T > 298.6) && (T < 300.6))
{
cp=1800+(600*(T-298.6)/2);
}
else
{
cp=2400;
}
*h=cp;
#endif
return cp;
}

Hi, Could you please let me know whether you solved the problem?

[Arjunsajith]

Sorry, I did not get any solution.

[Parvaneh]

Originally Posted by Arjunsajith

Sorry, I did not get any solution.

Thank you for your quick response. I found the solution. After installing Microsoft Visual Studio, the problem has been solved. Since I am using compiling, an external compiler such as Microsoft Visual Studio is required.



Thanks

[Krasa]

Please I am also having same issue which version of VS you have installed

[Parvaneh]

Originally Posted by Krasa

Please I am also having same issue which version of VS you have installed

Microsoft Visual Studio 2010. This version works well with most of the ANSYS versions.

[salkynbekov]

Originally Posted by Arjunsajith

Sorry, I did not get any solution.

Hello,


for me with UDF I get bad results.

If I use constant paramters and Boussinesq aproximation it gives me good convergense with experimental setup.

Did you get any results, could you share with your study?

Best Regards.

[marshallmccray]

I solved the problem by removing "&" from the name of my working directory. I know this is a one-off solution but posting here in case it helps.

[Camiwu]

hello, did you solved this problem? I'm using Fluent 2023, and VS 2022 version

[Anurag_B]

I had faced this problem as well. I seem to have gotten rid of this problem by opening fluent from "x86_x64 Cross Tools Command Prompt for VS 2019".

Open x86_x64 Cross Tools Command Prompt for VS 2019 (or your installed version) and navigate to the fluent directory and open fluent from there. This gets rid of a lot of warning for me too.

[Camiwu]

I've opened Fluent the way you mentioned but still got the same error.
I'm opening fluent using the following directory structure: fluent.exe 2ddp -t4 -mpi=intel

please let me know if there is something wrong with that. I only face this issue when in my code I want to write a .txt file, otherwise it loads well.