[visitor]

Is there an example of a UDF which reads CO at an outlet boundary? Looking for a way to read CO at two different time intervals, starting with something below, and if I can use these macros;

Initially inlet_1 = 10, inlet _2 = 0.

If (C_YI(c,t,i) > C_YI_M2(c,t,i))
(Increment inlet_1 by 1e-3) && ( decrement inlet_2 by 1e-3)

Just for starters, code below needs to read outlet via an a boundary ID, and then increment/decrement mass flows at inlet_1 and inlet_2. Thanks.

int main ()
{
real inlet_1, inlet_2; //the two inlets.
Inlet_1=10 //starting with a value of 10.
Inlet_2=0 //starting with a value of 0.
begin_f_loop(f, t) //start looping
{
If(C_YI(c,t,i) > C_YI_M2(c,t,i)) //the two 1st macro reads at current time, 2nd reads at 2 time steps behind. BUT I don't know how to get C_YI(c,t,i) macro to get CO (carbon monoxide)at the outlet.//
Inlet_1 +=1; //increment by 1 based on if condition.
Inlet_2 -=1; //decrement by 1 based on if condition.
Else if(C_YI(c,t,i) < C_YI_M2(c,t,i)) //this does the opposite to the above 'if' condition.
Inlet_1 -=1;
Inlet_2 +=1;
//if either way changes in CO value are within 5% (0.05), then leave & print inlets as they are.
Else ( ((C_YI(c,t,i))/( C_YI_M2(c,t,i)))<0.05 || ((C_YI_M2(c,t,i))/( C_YI (c,t,i)))<0.05 )
Message("RECOMMENDED value for inlet_1 within +/- 0.05 is: %g\n", inlet_1);
Message("RECOMMENDED value for inlet_1 within +/- 0.05 is: %g\n", inlet_2);
}
end_f_loop(f,t)
}