Reply To: Fluent DNB simulation

[Kinjal]

Hello the above problem is solved. Now I have got a recalibrated model for nucleation site density, udf for which is given below

 #include "udf.h"

 #define C 42.27

 #define n 4.67

 #define delta_T_ref 1

 

 DEFINE_BOILING_PROPERTY(nucleation_site_density, f, t, c0, t0, from_index, from_species_index, to_index, to_species_index)

{

   real nuc_d, subcool;

   real T_w=F_T(f,t);

   real T_SAT = C_STORAGE_R(c0,t0,SV_SAT_TEMPERATURE);

 

    

    /* Subcooling calculation: T_w - T_l */

   subcool = T_w - T_SAT;

 

    /* Calculate nucleation site density using the formula */

   nuc_d = pow(C,n) * pow((subcool / delta_T_ref), n);

 

   return nuc_d;

} This seems correct but why is fluent crashing while predicting wall temperature and printing on console bisection method cannot find wall temperature. How can I resolve this issue, Please help