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UDF Loading Error

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Old   March 22, 2021, 12:26
Default UDF Loading Error
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Venkat Ganesh
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Hey,

I'm writing a UDF to store viscosity in a UDM and access it for other UDFs.

I'm getting the below error when I'm trying to load the UDF I've written for accessing the stored UDM. I've included the message for build and load. It shows no error while building, but I'm pretty sure the issue is with the code and not the compiler as other sample UDFs are compiling well.

Quote:
Copied C:\Sim\Flowinapipe_files\dp0\FFF-4\Fluent/C:\Sim\Flowinapipe_files\dp0\FFF-4\Fluent\Viscosity Checkup.c to libudf\src
user_nt.udf file is outdated. So, recreating the file for 2ddp_host ...
(chdir "libudf\win64\2ddp_host")(system "copy "C:\PROGRA~1\ANSYSI~1\v202\fluent"\fluent20.2.0\sr c\udf\makefile_nt.udf "libudf\win64\2ddp_host\makefile" ")
1 file(s) copied.
(chdir "libudf")(chdir "win64\2ddp_host")user_nt.udf file is outdated. So, recreating the file for 2ddp_node ...
(chdir "libudf\win64\2ddp_node")(system "copy "C:\PROGRA~1\ANSYSI~1\v202\fluent"\fluent20.2.0\sr c\udf\makefile_nt.udf "libudf\win64\2ddp_node\makefile" ")
1 file(s) copied.
(chdir "libudf")(chdir "win64\2ddp_node")
Done.

550-0404: Opening library "C:\Sim\Flowinapipe_files\dp0\FFF-4\Fluent\libudf"...
Error at host: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64).

The system cannot find the file specified.

C:\Sim\Flowinapipe_files\dp0\FFF-4\Fluent\libudf\win64\2ddp_host\libudf.dll

Error at Node 0: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64).

The system cannot find the file specified.

C:\Sim\Flowinapipe_files\dp0\FFF-4\Fluent\libudf\win64\2ddp_node\libudf.dll

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:\Sim\Flowinapipe_files\dp0\FFF-4\Fluent\libudf\win64\2ddp_host\libudf.dll
Error Object: #f
This is the UDF.

Code:
/********************************************************************
UDF for defining the non-Newtonian fluid viscosity using APL model
*********************************************************************/

#include "udf.h"
DEFINE_PROPERTY(nnviscosity,c,t)
{
real mu = C_UDMI(c,t,0);
return mu;
}
Below is the code I've used for calculating and storing the viscosity and it is building and loading without any errors.

Code:
/******************************************************************************
UDM for storing the non-Newtonian fluid viscosity calculated using APL model
*******************************************************************************/

#include "udf.h"
#define domain_ID 1		/*Defines the primary phase which is the non-Newtonian fluid */

DEFINE_ADJUST(non_newtonian_viscosity_udm, domain)
{
Thread *t;
cell_t c;
domain = Get_Domain(domain_ID);

/* Declare the coefficients for APL model to calculate non-Newtonian viscosity */
real mu_0 = 15.9350;
real k = 19.5531;
real n = 0.2891;
real p = -1.00;
real shear_rate;

/* Calculate the viscosity and store in UDM */

thread_loop_c(t, domain) /* loops over all cell threads in domain */
{
begin_c_loop(c, t)	/* loops over cells in a cell thread */
{
shear_rate = C_STRAIN_RATE_MAG(c,t);
C_UDMI(c,t,0) = pow((pow(mu_0,p) + pow((k*pow(shear_rate, (n-1))),p)),pow(p,-1));
}
end_c_loop(c, t)
}

}
Please help in debugging the UDF. Thanks
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Old   March 22, 2021, 12:55
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You have a space in your filename, try without that.
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"The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform" is NOT the error after compiling. It is the error after loading. To see compiler errors, look at your screen after you click "build".
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Old   March 22, 2021, 14:09
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Venkat Ganesh
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Quote:
Originally Posted by pakk View Post
You have a space in your filename, try without that.
I can't believe it was that silly mistake. My bad. Thanks a lot. I was able to sort that out.
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Old   March 22, 2021, 14:52
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I can't believe Ansys still did not fix this. It has been a problem for so long, and the solution does not seem so difficult...
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"The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform" is NOT the error after compiling. It is the error after loading. To see compiler errors, look at your screen after you click "build".
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