{"id":390850,"date":"2024-10-22T13:57:27","date_gmt":"2024-10-22T13:57:27","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390850\/"},"modified":"2024-10-22T14:07:51","modified_gmt":"2024-10-22T14:07:51","slug":"390850","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390850\/","title":{"rendered":"Reply To: Fluent DNB simulation"},"content":{"rendered":"

<p> <\/p><div>#include “udf.h”<\/div><div> <\/div><div>DEFINE_PROFILE(dynamic_heat_flux, thread, position)<\/div><div>{<\/div><div>    int n = N_ITER;         \/\/ Get the current iteration number<\/div><div>    real q0 = 0.5e6;        \/\/ Initial heat flux (W\/m^2)<\/div><div>    real q;                 \/\/ Heat flux at the current iteration<\/div><div>    real chf = 3e6;      \/\/ CHF value (W\/m^2)<\/div><div> <\/div><div>    \/\/ Determine the heat flux based on the iteration number<\/div><div>    if (n <= 500)<\/div><div>    {<\/div><div>        q = q0;<\/div><div>    }<\/div><div>    else <\/div><div>    {<\/div><div>        int i;<\/div><div>        q = q0;<\/div><div>        for (i = 500; i <= n; i += 300) <\/div><div>        {<\/div><div> <\/div><div>            \/\/ Check if q approaches 75% of chf<\/div><div>            if (q >= 0.75 * chf) <\/div><div>            {<\/div><div>                q += 0.1e6; \/\/ Increment by an additional 10% step<\/div><div>            }<\/div><div>            else<\/div><div>            {<\/div><div>                q += 0.5e6; \/\/ Increment the heat flux by 0.5e6<\/div><div>            }<\/div><div>        }<\/div><div>    }<\/div><div> <\/div><div>    \/\/ Print the heat flux value after every 300 iterations<\/div><div>    if (n % 300 == 0)<\/div><div>    {<\/div><div>        Message(“Iteration %d: Heat Flux = %g W\/m^2\\n”, n, q);<\/div><div>    }<\/div><div> <\/div><div>    face_t f;<\/div><div>    begin_f_loop(f, thread)<\/div><div>    {<\/div><div>        F_PROFILE(f, thread, position) = q; \/\/ Apply the heat flux<\/div><div>    }<\/div><div>    end_f_loop(f, thread)<\/div><div>}<\/div><p>this is how heat flux is applied<\/p><p> <\/p><p><\/p><\/p>\n","protected":false},"template":"","class_list":["post-390850","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t