Issue with Flow Time Step choise
 

Hi all,

I'm simulating with DEM dropping of particles to mesure the variation of the Reposal Angle due to other parameters.

But I have a problem in choosing the correct Flow Time Step.

I'm simulating ONLY the discrate phase, whose equation are integrated using a Particle Time Step, that is much smaller than the Flow one, so the Flow Time Step last shouldn't affect the results, couse it is not used.

Unfortunately it does.:mad:

So, some of you knows if the Flow Time Step is definetely not affecting the results, and i can choose it freely? (it wuold mean that i have some other mistkes somewhere)

And in general, do you know if changing the Flow Time Step, in the middle of a simulation, and continue the simulation with a different FTS can affect the results?

I attached the picture of an heap of particles obtained by tracking particles with Particle Time Step and a "flat one" obtained by tracking particles with Flow Time Step