[fangdian]

HI
when i use the DEFINE_MASS_TRANSFER udf in ansys 14.0 . I compile the .c source file success ,then load it sucess as follows:
.....
(chdir "libudf")()
(chdir "ntx86\2ddp")()
# Generating ud_io1.h
test.c
# Generating udf_names.c because of makefile test.obj
udf_names.c
# Linking libudf.dll because of makefile user_nt.udf udf_names.obj test.obj
Microsoft (R) Incremental Linker Version 10.00.30319.01
Copyright (C) Microsoft Corporation. All rights reserved.
正在创建库 libudf.lib 和对象 libudf.exp
Done.
Opening library "F:\rongdi\seconddimension\libudf"...
Library "F:\rongdi\seconddimension\libudf\ntx86\2ddp\libud f.dll" opened
cell_vis
liq_gas_source
Done.
.....
But when i use the liq_gas_source in Multiphase Model dialog box , a error found in the messgage box:
Error: NO user-defined function have been loaded
Error object: #f

when i use it with Interpreting UDFs, it is OK!
on the other time, I use it with compile udf in the ansys 12.1. it is also ok!
why?
thanks!
fangdian


PS: my .c source file>
#include "udf.h"

DEFINE_PROPERTY(cell_vis,cell,thread) /*viscosity*/
{real ga_visy;
real temp=C_T(cell,thread);
if(temp<=1773)
ga_visy=2;
else if(temp<=1853)
ga_visy=1e-3*(119.003-0.061*temp);
else if(temp<=1873)
ga_visy=1e-3*(10.603-0.0025*temp);
else if(temp<=1973)
ga_visy=1e-3*(36.263-0.0162*temp);
else
ga_visy=3e-3;
return ga_visy;
}

DEFINE_MASS_TRANSFER(liq_gas_source,cell,thread,fr om_index,from_species_index,to_index,to_species_in dex)
{
real m_lg;
real T_frost=1773;
Thread *liq = THREAD_SUB_THREAD(thread, from_index);
Thread *soild = THREAD_SUB_THREAD(thread, to_index);
m_lg = 0.;
if (C_T(cell, soild) >= T_frost)
{
m_lg = -0.1*C_VOF(cell,soild)*C_R(cell,soild)*fabs(C_T(cel l,soild)-T_frost)/T_frost;
}
if ((m_lg == 0. ) && (C_T(cell, liq) <= T_frost))
{
m_lg = 0.1*C_VOF(cell,liq)*C_R(cell,liq)*fabs(T_frost-C_T(cell,liq))/T_frost;
}
return (m_lg);
}

[msaeedsadeghi]

I have asked Ansys Fluent support team. The problem is with the cracked version of fluent. In licensed version the compiled UDF can be easily selected in interaction menu.

[murdock88]

i have same problem in mass transfer udf i solved using these formulas:

1)Do not make copy pastes because of character set of program it gives direct errors

2)Do not use thread pointer like this

Thread *liq = THREAD_SUB_THREAD(thread, from_index);
Thread *soild = THREAD_SUB_THREAD(thread, to_index);

instead use thread pointer like this

Thread *liq;
liq = THREAD_SUB_THREAD(thread, from_index);
Thread *soild;
solid = THREAD_SUB_THREAD(thread, to_index);

i have solved my problem using these tips.

Have a good day.

[msaeedsadeghi]

Are you running in licensed version of Fluent?
Our problem is that the compiled UDF can not be hooked in interaction menu. It says "No user-defined functions have been loaded", but I have really compiled and loaded it.
I am highly professional in UDF writing but couldn't solve this problem yet.

[godspeedsam]

Originally Posted by msaeedsadeghi

Are you running in licensed version of Fluent?
Our problem is that the compiled UDF can not be hooked in interaction menu. It says "No user-defined functions have been loaded", but I have really compiled and loaded it.
I am highly professional in UDF writing but couldn't solve this problem yet.

Does anyone solve the problem?
I have the same problem running in licensed version of Fluent.

[coglione]

UDF-Manual 2.4.6. DEFINE_MASS_TRANSFER:

By default, FLUENT will attempt to hook mass transfer UDFs defined using DEFINE_LINEARIZED_MASS_TRANSFER. In order to hook a DEFINE_MASS_TRANSFER UDF to FLUENT, you must first issue the TUI command solve/set/expert and enter no at the Linearized Mass Transfer UDF? prompt.

cheers

[godspeedsam]

Originally Posted by coglione

UDF-Manual 2.4.6. DEFINE_MASS_TRANSFER:

By default, FLUENT will attempt to hook mass transfer UDFs defined using DEFINE_LINEARIZED_MASS_TRANSFER. In order to hook a DEFINE_MASS_TRANSFER UDF to FLUENT, you must first issue the TUI command solve/set/expert and enter no at the Linearized Mass Transfer UDF? prompt.

cheers

Thank you. It works.

[cheersend]

I created a new .cs file in the VS, and saved it as x.c (C program file). Then I copied the udf code into the programming text frame and deleted some of the spaces in the udf (maybe actually they are not all real space). Amazingly, the x.c works.

I don't know which step is the key, but it can be a bit of help.