Question #697432 on Yade changed:
https://answers.launchpad.net/yade/+question/697432
Status: Open => Answered
Jan Stránský proposed the following answer:
a) "modifying the position directly is likely to break Yade’s algorithms" [2].
O.cell.trsf is similar as setting position directly.
b) Some values are "propagated" to correct values during the iteration.
PeriTriaxController.strain is only updated inside the engine's action [3,4]. So
you can:
a) try to run one more step to let triax be updated
b) set cell.velGrad to get trsf=I in the next step
Cheers
Jan
[2] https://yade-dem.org/doc/user.html#imposed-velocity
[3]
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/PeriIsoCompressor.cpp#L126
[4]
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/PeriIsoCompressor.cpp#L195
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