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[Chareyre <674000@xxxxxxxxxxxxxxxxxx>]

> I don't think it makes a difference whether Cundall+Thornton use
> absolute or normalized space, since they only update positions from
> velGrad. Particles' velocities always represent only the fluctuation
> term, and that is true also for relative velocities.
>
>    
I feel uneasy when speaking about Cundall/Thornton since none of us 
really know the details of how they implemented periodicity, but clearly 
they got to account for velGrad in incident velocities somehow (be it 
with particles in the same or in different periods), because they used 
incremental algorithms. Updating positions is not enough.

-- 
homoDeform=1 does not handle the periodic case correctly.
https://bugs.launchpad.net/bugs/674000
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Status in Yet Another Dynamic Engine: Invalid

Bug description:
Currently, in the periodic case, if homoDeform=1 (alias Cundall way) we do not adjust the values of the relative velocities as according to the velocity gradient. This should be done, since, in such a case, we only update particle positions and not particle velocities.