Question #701438 on Yade changed:
https://answers.launchpad.net/yade/+question/701438
Status: Needs information => Answered
Jan Stránský proposed the following answer:
Hello,
please read [3], section "Please, no external links!".
MWE can be put directly in the question (assuming satisfying M=minimal
condition).
> even dt is small enough compared to the dt obtained from PWaveTimeStep()
> If I understood correctly, when dt is small enough, different dt should not
> affect the results. Do you have any ideas about it?
Straightforward answer could be that it is not small enough to neglect
the effect of its value
But, more importantly:
You are examining a few "random" particle's velocities in a simulation with
"many" particles.
Such DEM simulation is "chaotic", i.e. a small change in input may lead to big
changes for such quantities like velocity or position of one individual
particle.
You can try running exactly the same simulation (same O.dt, same initial
configuration, everything the same) in parallel, let's say with "-j 4" option
and you should get different result for each run [4].
So what you are experiencing with different velocities is the feature of DEM
and its computer solution.
So you should be interested in some "overall" quantities, like average
velocity of some band or region of particles
Concerning premature exit, I have no idea.
The log files of those simulations does not contain the line "Running
finished". But it has status: 0 (OK) result. So it must have been stopped
somehow differently than by stopSimulation() function..
Cheers
Jan
[3] https://www.yade-dem.org/wiki/Howtoask
[4] https://yade-dem.org/doc/formulation.html#result-indeterminism
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