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Message #11215
Re: [Question #266605]: unbalancedForce nan
Question #266605 on Yade changed:
https://answers.launchpad.net/yade/+question/266605
Jérôme Duriez proposed the following answer:
The numerator of uF is the mean (for all bodies) of "resulting forces"
acting on each body. And I think these resulting forces account in fact
for all contact forces acting on one body, but not gravity forces (when
present)
Then, for simulations with gravity, these "resulting forces" entering uF
computation are not supposed to be equal to (or tend towards) 0 when
bodies are in equilibrium. (But = - gravity force)
In the end, the current unbalancedForce computations (together with the
way gravity forces are implemented in Yade) are not really suited to
analyze the quasi-staticity of simulations involving gravity.....
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