[Walderdbeere]

I try to implement UDF:

DEFINE_CAVITATION_RATE

The udf:

/************************************************** *********************
UDF that is an example of a cavitation model different from default.
Can be interpreted or compiled.
************************************************** **********************/
#include "udf.h"
#define c_evap 1.0
#define c_con 0.1

DEFINE_CAVITATION_RATE(c_rate,c,t,p,rhoV,rhoL,mafV ,p_v,cigma,f_gas, m_dot)
{
real p_vapor = *p_v;
real dp, dp0, source;
p_vapor += MIN(0.195*C_R(c,t)*C_K(c,t), 5.0*p_vapor);
dp = p_vapor - ABS_P(p[c], op_pres);
dp0 = MAX(0.1, ABS(dp));
source = sqrt(2.0/3.0*rhoL[c])*dp0;
if(dp > 0.0)
*m_dot = c_evap*rhoV[c]*source;
else
*m_dot = -c_con*rhoL[c]*source;
}

After compilation I see announcement:

Creating user_nt.udf file for 3d ...
(system "copy "C:\PROGRA~1\ANSYSI~1\v145\fluent"\fluent14.5.0\sr c\makefile_nt.udf "libudf\ntx86\3d\makefile" ")
Liczba skopiowanych plik˘w: 1.
(chdir "libudf")()
(chdir "ntx86\3d")()
# Generating ud_io1.h
c_rate1.c
# Generating udf_names.c because of makefile c_rate1.obj
udf_names.c
# Linking libudf.dll because of makefile user_nt.udf udf_names.obj c_rate1.obj
Microsoft (R) Incremental Linker Version 9.00.30729.01
Copyright (C) Microsoft Corporation. All rights reserved.

Creating library libudf.lib and object libudf.exp

Done.

During calculation:

Error: chip-exec: function "mass_source_init::libudf" not found.
Error: chip-exec: function "singhal_fluent::libudf" not found.

iter continuity x-velocity y-velocity z-velocity k epsilon vf-water-vap time/iter
Error: chip-exec: function "mass_source_adjust::libudf" not found.
Error: chip-exec: function "singhal_fluent::libudf" not found.


Where is the problem?

[ghost82]

I have no problem with your compiled udf.
Turn on the Singhal et al cavitation model (in fluent command window, solve-->set-->expert), retain all defaults and change to yes to use the Singhal model.
Then compile the udf and hook the udf in function hooks in cavitation mass rate.

Daniele

[Walderdbeere]

Thank you very much, now it's working, but I don't have the results, that I expected. Nothing has happend, there is no vapour in my model and I don't know why. I compared with the Zwart model, which is in Fluent and in this solutions I see vapour.