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[Chareyre <674000@xxxxxxxxxxxxxxxxxx>]

> Hence incident velocity (computed from difference of velocities)
> will always correspond to the fluctuation velocity, regardless of
> positions in absolute space -- the meanfield velocity only acts at
> positions, and does not affect velocities.
>
>    
So incident velocity will be wrong I think.
It can't be define from fluctuations. Imagine 1 sphere per period, 
without fluctuational velocity, and you shear the period.
The incident velocity will always be zero, while there is obviously a 
relative displacement between the sphere and its sisters in the other 
periods.
> Yes, meaning of the number is shifted, but if you assign the old
> parameter to NewtonIntegrator, it will shift it before assigning to
> Cell.homoDeform (and gives a very clear warning about that). The
> ordering is according to the increasing smoothness of the adjustment
> (none, positions, velocities, velocities+convection).
>    

Ok, good to know. The ordering is clear.

Bruno

-- 
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.