[Kuntalika]

Hi, I am using fluent discrete phase model for particle-laden jet flow modelling.
For steady particle tracking, there is an option of specifying step length factor/length scale to specify the time step that will be used for Lagrangian particle equation solutions.
However, when switching on the unsteady particle tracking, I can see particle time step size and number of time step options open, along with the step length factor/length scale options.
q1. What I understand is the number of time steps would specify the number of steps in which the particle equation will be solved (or the particle will advance in the flow) before the particle tracking is paused and flow calculations are done (for unsteady flow). next the particle calculations will be done integrating the updated flow info. is this correct?
q2. if the particle time step is already there, what is the role of the length scale factor? do we need to worry about the length scale factor if we have specifier the particle time step?