Transient and Particle Tracking

The first time to do this case.

And i confused why i set the final simulation time(3650 days), but the particle trace time will come to '166371'(bigger than my simulation time).

Thanks!

Streamlines follow the flow field at the current time in the dac file, as if the velocity field would a steady-state field. If you want to trace the flow over a time period, you can use pathlines. See https://en.wikipedia.org/wiki/Streamlines,_streaklines,_and_pathlines for the respective definitions.