I have a transient flow and solute transport simulation running using a fortran code. The final solution time is 1 day. I need the output of hydraulic head for the output time of 0.5 day. I want to know what is going to change in my output data (0.5 day) if I run the same simulation for a longer time, e.g., 1000 days?
I know the system will get closer to steady state, but how will it affect the data for the output time that I want (0.5 day)?