{"id":377594,"date":"2024-08-07T16:27:59","date_gmt":"2024-08-07T16:27:59","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-fluent-udf-define_dpm_bc\/"},"modified":"2024-08-07T16:27:59","modified_gmt":"2024-08-07T16:27:59","slug":"ansys-fluent-udf-define_dpm_bc","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-fluent-udf-define_dpm_bc\/","title":{"rendered":"Ansys Fluent UDF: DEFINE_DPM_BC"},"content":{"rendered":"

Hi,<\/p>\n

I’m trying to compile a UDF to impose a criteria for particle adhesion. 
This is my first attempt at writing a UDF, I ran into a few errors when I tried to build it and then when I load the UDF I see the following error, I will attach the UDF after the error message, I need some advise on this matter.<\/p>\n

Thanks,
Kiran<\/p>\n

 <\/p>\n

error:<\/strong><\/p>\n

Files udf_names.c and user_nt.udf in 3ddp_host are up-to-date.<\/p>\n

 <\/p>\n

Copyright 1987-2024 ANSYS, Inc. All Rights Reserved.<\/p>\n

Compiler and linker: Microsoft Visual C++<\/p>\n

# Linking libudf.dll because of makefile user_nt.udf udf_names.obj test-UDF-four.obj<\/p>\n

LINK : fatal error LNK1104: cannot open file ‘kernel32.lib’<\/p>\n

NMAKE : U1077: ‘link -nologo \/Libpath:”C:\\PROGRA~1\\ANSYSI~1\\v241\\fluent”\\fluent24.1.0\\win64\\3ddp_host \/Libpath:”C:\\PROGRA~1\\ANSYSI~1\\v241\\fluent”\\fluent24.1.0\\multiport\\win64\\net\\shared \/dll \/out:libudf.dll udf_names.obj test-UDF-four.obj mport.lib fl2410.lib ‘ : return code ‘0x450’<\/p>\n

Stop.<\/p>\n

Files udf_names.c and user_nt.udf in 3ddp_node are up-to-date.<\/p>\n

 <\/p>\n

Copyright 1987-2024 ANSYS, Inc. All Rights Reserved.<\/p>\n

Compiler and linker: Microsoft Visual C++<\/p>\n

# Linking libudf.dll because of makefile user_nt.udf udf_names.obj test-UDF-four.obj<\/p>\n

LINK : fatal error LNK1104: cannot open file ‘kernel32.lib’<\/p>\n

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 test-UDF-four.obj mport.lib fl_mpi2410.lib ‘ : return code ‘0x450’<\/p>\n

Stop.<\/p>\n

 <\/p>\n

Done.<\/p>\n

 <\/p>\n

kiran: Opening library “C:\\Users\\usr\\OneDrive\\Desktop\\Me\\UDF_compiled\\test_files\\dp0\\FFF-1\\Fluent\\one_way_transient-1″…<\/p>\n

ERROR: The UDF library you are trying to load (one_way_transient-1) is not compiled for parallel use on the current platform (win64).<\/p>\n

The system cannot find the file specified.<\/p>\n

 <\/p>\n

 <\/p>\n

C:\\\\Users\\\\usr\\\\OneDrive\\\\Desktop\\\\Me\\\\UDF_compiled\\\\test_files\\\\dp0\\\\FFF-1\\\\Fluent\\\\one_way_transient-1\\\\win64\\\\3ddp_host\\\\libudf.dll<\/p>\n

 <\/p>\n

Done.<\/p>\n

 <\/p>\n

kiran: Opening library “C:\\Users\\usr\\OneDrive\\Desktop\\Me\\UDF_compiled\\test_files\\dp0\\FFF-1\\Fluent\\one_way_transient-1″…<\/p>\n

ERROR: The UDF library you are trying to load (one_way_transient-1) is not compiled for parallel use on the current platform (win64).<\/p>\n

The system cannot find the file specified.<\/p>\n

 <\/p>\n

 <\/p>\n

C:\\\\Users\\\\usr\\\\OneDrive\\\\Desktop\\\\Me\\\\UDF_compiled\\\\test_files\\\\dp0\\\\FFF-1\\\\Fluent\\\\one_way_transient-1\\\\win64\\\\3ddp_node\\\\libudf.dll<\/p>\n

 <\/p>\n

Error: An error occurred in the previous operation.<\/p>\n

The details can be found in the text output.<\/p>\n

Error Object: #f<\/p>\n

 <\/p>\n

 <\/p>\n

UDF:<\/strong><\/p>\n

\n
#include “udf.h”<\/div>\n
#include “dpm.h”<\/div>\n

<\/p>\n

\/* Define constants *\/<\/div>\n
#define Rho_air 1.225  \/* Density of air in kg\/m^3 *\/<\/div>\n
#define Cd 0.44        \/* Drag coefficient *\/<\/div>\n
#define mu 0.196       \/* Friction coefficient *\/<\/div>\n<\/div>\n
\n
DEFINE_DPM_BC(particle_bc, p, t, f, normal, dim)<\/div>\n
{<\/div>\n
    \/\/ Particle *p;<\/div>\n
    \/\/ real A = P_AREA(P_DIAM(p));  \/* Assuming a method to calculate the projected area of the particle *\/<\/div>\n
    real V = sqrt(P_VEL(p)[0] * P_VEL(p)[0] + P_VEL(p)[1] * P_VEL(p)[1] + P_VEL(p)[2] * P_VEL(p)[2]);  \/* Velocity magnitude in m\/s *\/<\/div>\n
    real radius = P_DIAM(p) \/ 2.0;<\/div>\n
    real A = M_PI * radius * radius;  \/* M_PI is a constant for π *\/<\/div>\n

<\/p>\n

   <\/div>\n
    \/* Get the thread and cell pointers *\/<\/div>\n
    Thread *t0 = P_CELL_THREAD(p);<\/div>\n
    cell_t c0 = P_CELL(p);<\/div>\n
   <\/div>\n
    \/* Get local pressure at the particle’s location *\/<\/div>\n
    real P_local = C_P(c0, t0);<\/div>\n

<\/p>\n

    \/* Calculate aerodynamic force Fa *\/<\/div>\n
    real Fa = 0.5 * Rho_air * A * Cd * V * V;<\/div>\n

<\/p>\n

    \/* Calculate normal force Fn *\/<\/div>\n
    real Fn = P_local * A;<\/div>\n

<\/p>\n

    \/* Calculate frictional force Ff *\/<\/div>\n
    real Ff = mu * Fn;<\/div>\n

<\/p>\n

    \/* Check the removal condition *\/<\/div>\n
    if (Fa > Ff)<\/div>\n
    {<\/div>\n
        \/* Particle needs to be removed from the surface *\/<\/div>\n
        return PATH_ACTIVE; \/*No adhesion*\/<\/div>\n
    }<\/div>\n
    else<\/div>\n
    {<\/div>\n
        \/* Particle sticks to the boundary *\/<\/div>\n
        P_USER_REAL(p, 0) = 1.;<\/div>\n
        return PATH_ABORT; \/*Adhesion*\/<\/div>\n
    }<\/div>\n
}<\/div>\n<\/div>\n

 <\/p>\n

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