Learning Forum

[sjohn]

I wrote the following UDF for heteregeneous reactions in a case for multiphase flow. 

#include "udf.h"

 

/* Define constants */

#define R 1.987

/* Universal gas constant in cal/(mol*K) */

#define Pre 1

/* Pre-exponential factor in m^3/(mol*s) */

#define EA 5000

/* Activation energy in cal/mol */

 

/* Define phase indices */

#define liquid_index 3

/* Index for liquid phase */

#define gas_index 2

/* Index for gas phase B */

 

/* Heterogeneous reaction rate definition */

DEFINE_HET_RXN_RATE(sj_reaction_rate, c, t, r, mw, yi, rr, rr_t)

{

    /* Get the temperature of the liquid phase */

    real T_liquid = C_T(c, t); /* Temperature in K */

 

    /*Calculate the concentration of A in the liquid phase */

    real A_conc = C_YI(c, t, liquid_index);

 

    /* Calculate the reaction rate */

    *rr = Pre * exp(-EA / (R * T_liquid)) * A_conc;

 

    /* Optional: Store additional information if needed */

    C_UDMI(c, t, 0) = Pre; /* Store pre-exponential factor */

    C_UDMI(c, t, 1) = EA; /* Store activation energy */

    C_UDMI(c, t, 2) = R; /* Store gas constant */

    C_UDMI(c, t, 3) = T_liquid; /* Store temperature */

}

 

I am getting the following  warning upon compiling my UDF with the built-in compiler.

 scons: warning: No version of Visual Studio compiler found - C/C++ compilers most likely not set correctly

File "C:\Users\....\libudf\win64\3ddp_host\SConstruct", line 20, in

Compiler path: "C:\PROGRA~1\ANSYSI~1\v241\fluent"\ntbin\clang\bin\clang-cl

Linker   path: "C:\PROGRA~1\ANSYSI~1\v241\fluent"\ntbin\clang\bin\lld-link

 

After compiling, I click load and then initialize and run the simulation. Then I get a fatal error:

 ==============================================================================

==============================================================================

 Node 1: Process 6996: Received signal SIGSEGV.

 ==============================================================================

==============================================================================

 Node 2: Process 27464: Received signal SIGSEGV.

 ==============================================================================

 Node 0: Process 26448: Received signal SIGSEGV.

 ==============================================================================

==============================================================================

 Node 3: Process 10824: Received signal SIGSEGV.

 ==============================================================================

 Error in the fluent (fl) process : ended abnormally

 

Other than checking the box for Setup Compilation Environment for UDF in Fluent Launcher, do I need to anything else?

 

 

[sjohn]

I also tried not using the built in compiler (after deleting the libudf folder) but get athe following error messages:

Compiler and linker: Microsoft Visual C++

# Generating ud_io1.h

simple_reaction.c

# Generating udf_names.c because of makefile simple_reaction.obj

udf_names.c

# Linking libudf.dll because of makefile user_nt.udf udf_names.obj simple_reaction.obj

LINK : fatal error LNK1104: cannot open file 'kernel32.lib'

NMAKE : U1077: 'link -nologo /Libpath:"C:\PROGRA~1\ANSYSI~1\v241\fluent"\fluent24.1.0\win64\3ddp_node /Libpath:"C:\PROGRA~1\ANSYSI~1\v241\fluent"\fluent24.1.0\multiport\win64\mpi\shared /dll /out:libudf.dll udf_names.obj simple_reaction.obj mport.lib fl_mpi2410.lib ' : return code '0x450'

Stop.

 

Done.

 

BSSPF3F1PZG: Opening library "C:\Users\...\libudf"...

ERROR: 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:\\Users\\...\\libudf\\win64\\3ddp_host\\libudf.dll

 

Done.

 

BSSPF3F1PZG: Opening library "C:\Users\...\libudf"...

ERROR: 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:\\Users\\...\\libudf\\win64\\3ddp_host\\libudf.dll

 

Error: An error occurred in the previous operation.

 The details can be found in the text output.

Error Object: #f