Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Bruno Chareyre posted a new comment:
@Jérôme: the workaround is to not have interactions with the large body
at step 0
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Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Jérôme Duriez posted a new comment:
Does this mean, we have a solution (or at least a good work around) for
the related long-lasting bug ? If yes, it would be great to include it
in the bug report.
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Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Status: Answered => Solved
VG confirmed that the question is solved:
Thanks Jan Stránský, that solved my question.
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Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Bettina Suhr posted a new comment:
Hi Varun,
your last MWE script worked for me, using yade-1.20.0. No spheres
crossed the boxes and nothing dissapeared. If you continue to face
problems, you could try to
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Jan Stránský proposed the following answer:
Hello,
by default this would work on newer versions of Yade. In your case, you
have to set mass and inertia manually
O.bodies[top_id].state.mass =
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
VG posted a new comment:
I am using version 1.07.0
The output of the two commands are as follows:
O.bodies[top_id].state.mass
0.0
O.bodies[top_id].state.inertia
Vector3(nan,nan,nan)
Thanks
Varun
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Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Jan Stránský proposed the following answer:
The script works fine for me (at least nothing disappears).
What version of Yade do you use?
What is the output of "O.bodies[top_id].state.mass" and
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
VG posted a new comment:
Thanks Jan!
I modified the generation of top and bottom boxes as you suggested. The boxes
seem to be generated the way they should be. However, as soon as the simulation
starts, those
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Jan Stránský proposed the following answer:
Hi Varun,
change the creation of your top box in the following way. To be sure it
works, I would modify also the bottom in the same way.
to get a force reaction,
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
VG posted a new comment:
Hello Jan,
Thanks for your response. I tried what you suggested, i.e. one small box
(1/3 of the periodic cell), but it still seems to have the same problem
and the top box is just
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Jan Stránský proposed the following answer:
Just reformulating Bruno's and Jerome's answers. Instead of one big box,
try to use e.g. clump of 3x3 boxes, each with dimensions 1/3 of cell size.
The simulation is
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
VG posted a new comment:
Hi Bruno,
Thanks for your response.
I tried to incorporate the changes you suggested, but the problem still
doesn't seem to go away. Also, another perplexing thing I notice from
the
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Linked to bug: #1112763
https://bugs.launchpad.net/bugs/1112763
"interaction not detected in a VERY specific (body size = period size) case"
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Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Status: Open => Answered
Bruno Chareyre proposed the following answer:
You found a known bug for large objects in periodic simulations.
The bug seems to show up especially when some interactions exist at
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Status: Answered => Open
VG is still having a problem:
Below is one minimal working example which shows such problem. I am trying to
compress an assembly of particles between the two plates. The top plate
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
VG posted a new comment:
Hello Bettina,
Thanks for your note. Yes, the problem seems similar.
Also, on taking a closer look, I notice that after some simulation time
some particles seem to be overlapping. Does
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Bettina Suhr posted a new comment:
Hi Varun,
maybe I have the same problem as you have. Yesterday, I posted a
question (290933). There is a minimal working example (with a typo,
please change the definition of
Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
VG posted a new comment:
Thanks for your response, Jan!
I will get the MWE and post it here.
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Question #290950 on Yade changed:
https://answers.launchpad.net/yade/+question/290950
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
please read [1], especially the MWE part (there might be other problems
than stiffness)
> Can I solve this problem by
New question #290950 on Yade:
https://answers.launchpad.net/yade/+question/290950
I intend to create a cloud of spheres in a box which has:
- periodic boundary conditions for all vertical walls
- and rigid floor & ceiling
I am applying compression from the ceiling. Now, what I observe is that
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