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[Chien-Cheng Hung <question694379@xxxxxxxxxxxxxxxxxxxxx>]

Question #694379 on Yade changed:
https://answers.launchpad.net/yade/+question/694379

    Status: Answered => Open

Chien-Cheng Hung is still having a problem:
Hi Jan,

Thanks for your reply.

> Basic dualism in mechanics, either you know/prescribe displacement
(rotation,strain,...) or force (moment, stress,...), never both.

I see the reason why... thanks for the explanation.

> Yes, you saved not-stress-free (overlapping) packing, so after
loading, repulsive forces are computed (from the overlaps).

Is it possible that I can save a stress-free packing? Or by any chance
that I could temporarily remove the repulsive forces, do the isotropic
compression, and then recover the initial repulsive forces (just a
thought)?

> What is "their original energy states"?

I just meant the initial repulsive forces. I will try to be careful with
the word I use next time...

> In the second simulation, I see large gap between spherical particles
and walls. Why are there the gaps? They are reason that "all the
particles start to move around in any direction", so maybe reducing the
gap would make the simulation "nicer"?

I've tried that but the simulation does not really get better since the
real problem is that the moving particles would always go through the
boundary walls. I've tried to increase the stiffness of the walls but
still get the same. Do you have any idea about this?

Thanks, again.

Cheers,
Chien-Cheng

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