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[Bug 399963] Re: TriaxialTest gives different results with ScGeom and Dem3DofGeom, cause is not known

To: yade-dev@xxxxxxxxxxxxxxxxxxx
From: Chiara Modenese <c.modenese@xxxxxxxxx>
Date: Fri, 10 Sep 2010 13:47:44 -0000
Reply-to: Bug 399963 <399963@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Ratcheting could explain different results between ScGeom and Dem3Dof in
PBC. In fact, if one tries the PBC with ScGeom and bool
avoidGranularRatcheting=false (it would be true by default) would see
that, when the packing reaches a relatively compacted state, kinetic
energy would badly increase and unbalanced force as well, due to very
high particles rotation. The same situation occurs once using other
contact laws in PBC (e.g. HM no-slip) and, again, only if ratcheting is
NOT avoided.

Chiara

-- 
TriaxialTest gives different results with ScGeom and Dem3DofGeom, cause is not known
https://bugs.launchpad.net/bugs/399963
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Status in Yet Another Dynamic Engine: In Progress

Bug description:
Seems that there is too much friction with the walls, but inspecting the XML file gives nothing suspicious. UnbalancedForce sits constantly at 1.1407 after a small while, without going down.