Problem: How can I create particle paths in steady state flow? With unsteady flow?
Solution: In Tecplot creating streamtraces will show you massless particles with steady state flow. With CFDA the default condition for creating particle paths is steady-state. If you want to specify unsteady flow then you need to identify the time levels in the Unsteady Flow Options dialog. Also CFDA allows you to perform a particle path calculation with steady-state or unsteady-state with particles with mass. It also allows the creation of Streaklines which are the lines created by periodic (frequent) releases of mass-less particles at the same location. For steady flow Tecplots streamtraces massless particle paths and streaklines are all the same.