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The following UDF,named inlet_my,adjusts the mass flow rate from 1.00kg/s to 1.35kg/s when the physical time step is greater than 0.2 seconds.
#include "udf.h"
DEFINE_PROFILE(inlet_my,th,i
{
    face_t f;
    begin_f_loop(f,th
       {
        if (CURRENT_TIME<=0.01
            F_PROFILE(f,th,i()=3.0;
        else if (CURRENT_TIME<=0.02&& CURRENT_TIME>0.01()
            F_PROFILE(f,th,i()=4.0;
         else
            F_PROFILE(f,th,i()=5.0;
{}
end_f_loop(f,th();
{}
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