[dakaezekoye]

Hello everyone, I got the error below while trying to build the UDF for the Zwart Cavitation Model in FLUENT 2019.

Creating library libudf.lib and object libudf.exp
zgb_model2(3).obj : error LNK2019: unresolved external symbol __imp__op_pres referenced in function _c_rate
C:\PROGRA~1\ANSYSI~1\v194\fluent\fluent19.4.0\mult iport\win64\mpi\shared\mport.lib : warning LNK4272: library machine type 'x64' conflicts with target machine type 'x86'
C:\PROGRA~1\ANSYSI~1\v194\fluent\fluent19.4.0\win6 4\3ddp_node\fl_mpi1940.lib : warning LNK4272: library machine type 'x64' conflicts with target machine type 'x86'
libudf.dll : fatal error LNK1120: 1 unresolved externals


This is the UDF code;

#include "udf.h"
#define c_evap 5.0
#define c_con 0.01
#define alfa_n 0.0005
#define Rb 0.000001
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*3.0*alfa_n*(1-mafV[c])/Rb*rhoV[c]*source;
else
*m_dot = -c_con*3.0*mafV[c]*rhoV[c]/Rb*source;
}


Please can anyone help?