Reply To: Fluent DNB simulation

[Kinjal]

 

#include “udf.h”

 

DEFINE_PROFILE(dynamic_heat_flux, thread, position)

{

    int n = N_ITER;         // Get the current iteration number

    real q0 = 0.5e6;        // Initial heat flux (W/m^2)

    real q;                 // Heat flux at the current iteration

    real chf = 3e6;      // CHF value (W/m^2)

 

    // Determine the heat flux based on the iteration number

    if (n <= 500)

    {

        q = q0;

    }

    else 

    {

        int i;

        q = q0;

        for (i = 500; i <= n; i += 300) 

        {

 

            // Check if q approaches 75% of chf

            if (q >= 0.75 * chf) 

            {

                q += 0.1e6; // Increment by an additional 10% step

            }

            else

            {

                q += 0.5e6; // Increment the heat flux by 0.5e6

            }

        }

    }

 

    // Print the heat flux value after every 300 iterations

    if (n % 300 == 0)

    {

        Message(“Iteration %d: Heat Flux = %g W/m^2\n”, n, q);

    }

 

    face_t f;

    begin_f_loop(f, thread)

    {

        F_PROFILE(f, thread, position) = q; // Apply the heat flux

    }

    end_f_loop(f, thread)

}

this is how heat flux is applied