[spk]

Hi guys,

I need help!!!
I'm not familiar with UDF. I compiled the Udf of cavitation rate which is found at udf manual. I add the last line (Message...) and everything is ok.
I can see the values of cavitation mass transfer rate at fluent window. But i want to save these values in a .txt file. How can i do this?

Thanks a lot!

#include"udf.h"
#define c_evap 1.0
#define c_con 0.1
DEFINE_CAVITATION_RATE(user_cav_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;
Message("Cavitation Mass Transfer Rate: %g\n",m_dot);
}

[dmoroian]

#include"udf.h"
#define c_evap 1.0
#define c_con 0.1
DEFINE_CAVITATION_RATE(user_cav_rate, c, t, p, rhoV, rhoL, mafV, p_v, cigma, f_gas, m_dot)
{
   FILE *pf;
   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;

   Message("Cavitation Mass Transfer Rate: %g\n",m_dot);
   
   if(NULL == (pf = fopen("bubu.txt","a")))
      Error("Could not open file for append!\n");
   
   fprintf(pf,"%e\n",m_dot);
   fclose(pf);
}

[spk]

Thanks friend!!!
It works!!!