[suraj9735]

Hello Everyone!

I am trying to write a UDF to heat my plate. When the average temperature of my particular cell thread reach to 453K, I want the source term should OFF for the next 100 seconds and repeat the same logic...

But the plot of average temperature doesn't follow the logic...

Could you please tell me what's wrong with the next 100 seconds OFF logic?


*******my_code**********

/********************/
/* User-Defined Function */
/*******************/
#include "udf.h"
int last_ts = -1; /* Global variable. Time step is never <0 */
real temp_avg = 0.;
real time_heat_flux_zero = 0.;

DEFINE_ADJUST(my_adjust,d)
{
real n = 0.;
real temp_sum = 0.;
int ID=13;
Thread *t=Lookup_Thread(d,ID);
cell_t c;

int curr_ts;
curr_ts = N_TIME;
if (last_ts != curr_ts)
{
last_ts = curr_ts;

/* things to be done only on first iteration of each time step
can be from here....... */

begin_c_loop(c,t)
temp_sum +=C_T(c,t);
n=n+1;

end_c_loop(c,t)

temp_avg=temp_sum/n;

if (temp_avg > 453)
{
time_heat_flux_zero = CURRENT_TIMESTEP + 100.0;

}
if(time_heat_flux_zero > 0.0)
{
time_heat_flux_zero -= CURRENT_TIMESTEP;
}


}
}


DEFINE_SOURCE(my_heat_source, c, t, dS, eqn)


{


real source;
if (time_heat_flux_zero > 0.01)
/* If the temperature is low, Cartridge heater OFF */


{source = 0.;


}
else

{
source = 31830988.62;

/* Otherwise, Cartridge Heater ON */



}
dS[eqn] = 0;
printf("source: %g\n", source);


return source;
}