Question #264191 on Yade changed:
https://answers.launchpad.net/yade/+question/264191
Bruno Chareyre posted a new comment:
You are absolutely right on the double-contact problem. It is a know issue, see:
https://bugs.launchpad.net/yade/+bug/850864
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Question #264456 on Yade changed:
https://answers.launchpad.net/yade/+question/264456
Bruno Chareyre posted a new comment:
I can't reproduce any explosion with the provided script (with yade
1.12.0-94) . I don't understand the problem, sorry.
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Question #264342 on Yade changed:
https://answers.launchpad.net/yade/+question/264342
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hello,
However, the confining pressure is achieved by by growing particles,
which means I can't control the real particle size...
You
Question #264342 on Yade changed:
https://answers.launchpad.net/yade/+question/264342
Bruno Chareyre proposed the following answer:
Am I getting the concept right?
Yes. The only problem is that the only valid imposed flux is 0. :-/
Non-zero fluxes still have to be implemented and it is no really
Question #264319 on Yade changed:
https://answers.launchpad.net/yade/+question/264319
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi,
This particular algorithm has not been maintained unfortunately. You could
reimplement it or (simpler) use a dynamic growth method
Question #263739 on Yade changed:
https://answers.launchpad.net/yade/+question/263739
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hello,
I don't understand exactly in which sense it is not what you expect. I suggest
to forget max_vel, assign a very large value
Question #263739 on Yade changed:
https://answers.launchpad.net/yade/+question/263739
Status: Open = Answered
Bruno Chareyre proposed the following answer:
coupled with a small max_vel
No need I think. For very smooth evolutions select a large N (10e4 or
so), in which case number can be 1
Question #263564 on Yade changed:
https://answers.launchpad.net/yade/+question/263564
Bruno Chareyre posted a new comment:
Can you please send an example script showing the problem to my
personnal adress?
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Question #262899 on Yade changed:
https://answers.launchpad.net/yade/+question/262899
Bruno Chareyre proposed the following answer:
Another serious candidate for FEM with Python (never coupled with Yade yet):
http://sfepy.org/doc-devel/index.html
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Question #262899 on Yade changed:
https://answers.launchpad.net/yade/+question/262899
Status: Open = Answered
Bruno Chareyre proposed the following answer:
An example with OOFEM (so that Jan will not have to cite himself ;) ):
http://www.engmech.cz/2012/proceedings/pdf/018_Stransky_J-FT.pdf
Question #263634 on Yade changed:
https://answers.launchpad.net/yade/+question/263634
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hello Andy, what you describe sounds like a bug. MatchMakers would be broken?
Did you check some example scripts using matchmakers
Question #263634 on Yade changed:
https://answers.launchpad.net/yade/+question/263634
Bruno Chareyre posted a new comment:
@Anton,
Thanks but I think the OP is still a pending issue.
Ip2_FrictMat_FrictMat_FrictPhys::frictAngle is already a MatchMaker, so the
first attempt of Andy should have
Question #263553 on Yade changed:
https://answers.launchpad.net/yade/+question/263553
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi,
1. Yes it is necessary. Depending on RAM and number of cores you can speedup
compilation with
cmake -DCHUNKSIZE=[N] #with N1
Question #262775 on Yade changed:
https://answers.launchpad.net/yade/+question/262775
Bruno Chareyre proposed the following answer:
You have a special contact law, thus unless special care is taken you can't
rely on GSTimeStepper or PWaveTimestep.
See #3 in [1].
[1] https
Question #262775 on Yade changed:
https://answers.launchpad.net/yade/+question/262775
Bruno Chareyre requested more information:
critical timestep is much bigger than timestep I'm using for my
simulation
How do you know?
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Question #262922 on Yade changed:
https://answers.launchpad.net/yade/+question/262922
Status: Open = Answered
Bruno Chareyre proposed the following answer:
NewtonIntegrator(damping=0.7,...
Erm... do you know what newton damping is?
Did you put 0.7 because it is the default in PFC??
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Question #262775 on Yade changed:
https://answers.launchpad.net/yade/+question/262775
Bruno Chareyre proposed the following answer:
If the problem is not in your contact law, it could be simply the timestep too
large, violating stability condition.
If the problem is in your contact law
Question #262775 on Yade changed:
https://answers.launchpad.net/yade/+question/262775
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hello Hicham, there are only two possibilities IMHO:
1- Something is wrong in your simulation , then particles velocities become
NaN
Question #261724 on Yade changed:
https://answers.launchpad.net/yade/+question/261724
Bruno Chareyre proposed the following answer:
If this is a really really bad issue, maybe handle Frict_Burger as Frict_Frict
in the short term. Or just don't mix Burger and frictional materials.
Isn't
Question #261724 on Yade changed:
https://answers.launchpad.net/yade/+question/261724
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Probably a mistake in goReverse. I can't check details now sorry.
Best way to debug is to not use static_cast's, they hide the problems
Question #261724 on Yade changed:
https://answers.launchpad.net/yade/+question/261724
Bruno Chareyre proposed the following answer:
replacing the static_cast with YADE_CAST didn't change anything.
Just a good practice when trying to solve such problem. You are using a
debug build, yes?
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Question #262286 on Yade changed:
https://answers.launchpad.net/yade/+question/262286
Bruno Chareyre proposed the following answer:
@Jan
Do you also think that QGLView is impossible in this situation (I was expecting
that but I suggested Deepak to ask away)?
Bruno
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Question #261724 on Yade changed:
https://answers.launchpad.net/yade/+question/261724
Status: Open = Answered
Bruno Chareyre proposed the following answer:
I think you need to define Ip2::goReverse for dealing with the failing sequence.
Grep goReverse in the source code, you will find
Question #261779 on Yade changed:
https://answers.launchpad.net/yade/+question/261779
Status: Open = Answered
Bruno Chareyre proposed the following answer:
As discussed:
replace in the first test:
if (phys-unpMax!=0 ...) by
if (phys-unpMax=0 ...)
Don't forget to make the default negative
Question #261610 on Yade changed:
https://answers.launchpad.net/yade/+question/261610
Bruno Chareyre posted a new comment:
Thank you very much for reporting the bug and the bugfix in the same move!!
Let's see when/if it occures.
Bruno
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Question #261610 on Yade changed:
https://answers.launchpad.net/yade/+question/261610
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hello Luc,
Fixing the sources by yourself is not an option I would recommend, and changing
CMake parameters will probably not work
Question #261724 on Yade changed:
https://answers.launchpad.net/yade/+question/261724
Bruno Chareyre proposed the following answer:
Hi,
My first reaction here was where is the hpp?. It is not shown.
It would be helpful to have the two files. Not just pasted in textbox as
indentation and syntax
Question #261272 on Yade changed:
https://answers.launchpad.net/yade/+question/261272
Bruno Chareyre posted a new comment:
Yet another way to browse offline: install yade-doc package (or
yadedaily-doc or any other yadeXXX-doc).
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Question #261447 on Yade changed:
https://answers.launchpad.net/yade/+question/261447
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi Jérôme,
I can't give a really precise estimate but as far as I remember the 15% in
Scholtes 2009 becomes 2-3% after the fix
Question #261272 on Yade changed:
https://answers.launchpad.net/yade/+question/261272
Bruno Chareyre posted a new comment:
The website went down, Remi fixed that after 1 day. Thank you Huaran Wu
(?) for notifying.
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Question #260626 on Yade changed:
https://answers.launchpad.net/yade/+question/260626
Bruno Chareyre posted a new comment:
See the hyperlink in #4
;-)
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Question #260626 on Yade changed:
https://answers.launchpad.net/yade/+question/260626
Bruno Chareyre proposed the following answer:
Hi,
Precision depends on which format you save to. If you save in binary
(filename.yade) it will have the maximum precision.
If you save in xml
Question #260626 on Yade changed:
https://answers.launchpad.net/yade/+question/260626
Bruno Chareyre proposed the following answer:
@Jan
The fact that two floats are converted to the same string with print does not
imply that they are equal. Before printing a number, python is rounding
Question #260503 on Yade changed:
https://answers.launchpad.net/yade/+question/260503
Bruno Chareyre posted a new comment:
Hello Luis,
I don't understand the initial question sorry.
Regarding #2, we don't know what script you refer to, nor the meaning of
doesn't work.
I suggest to elaborate
Question #258401 on Yade changed:
https://answers.launchpad.net/yade/+question/258401
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi,
Reading again, I think the answer is no: you don't seem to have any problem
with units.
As for why you get so high values of forces
Question #258679 on Yade changed:
https://answers.launchpad.net/yade/+question/258679
Bruno Chareyre proposed the following answer:
I also think like Jan. Most likely the dissipated energy is an accumulation
starting from zero after each load().
For consistent plots you need to add the energy
Question #258763 on Yade changed:
https://answers.launchpad.net/yade/+question/258763
Status: Open = Answered
Bruno Chareyre proposed the following answer:
You are facing a numercial instability. Updating the timestep every 100
iterations with a safety factor =0.8 is not enough at some
Question #258782 on Yade changed:
https://answers.launchpad.net/yade/+question/258782
Status: Open = Answered
Bruno Chareyre proposed the following answer:
flow is not a label of the engine in your script maybe?
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Question #258782 on Yade changed:
https://answers.launchpad.net/yade/+question/258782
Status: Open = Answered
Bruno Chareyre proposed the following answer:
I just tried this and I did not find any problem. I don't understand why
it doesn't work for you.
$ yade-trunk oedometer.py
Yade [1
Question #258401 on Yade changed:
https://answers.launchpad.net/yade/+question/258401
Bruno Chareyre proposed the following answer:
Hi Luis,
Tip penetration should occure in a granular layer wich is initially at static
equilibrium, no?
I don't see anything in your script for generating
Question #258445 on Yade changed:
https://answers.launchpad.net/yade/+question/258445
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Dear Fu,
It seems to me than one hour would not be enough to only understand all the
above messages and the corresponding scripts.
Add
Question #258550 on Yade changed:
https://answers.launchpad.net/yade/+question/258550
Bruno Chareyre posted a new comment:
Thanks Jérôme for noticing the version problem.
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Question #258444 on Yade changed:
https://answers.launchpad.net/yade/+question/258444
Bruno Chareyre proposed the following answer:
@Bruno: I am unable to get the desired result by increasing the Young
value.
I see
O.materials.append(FrictMat(density=1000,young=1e4,poisson=0.3,frictionAngle
Question #234513 on Yade changed:
https://answers.launchpad.net/yade/+question/234513
Bruno Chareyre posted a new comment:
Since google likes this page when it comes to importing libraries, it may hide
another important thread regarding imports.
If yade crash when importing something, please see
Question #258336 on Yade changed:
https://answers.launchpad.net/yade/+question/258336
Status: Open = Answered
Bruno Chareyre proposed the following answer:
No.
B
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Question #258336 on Yade changed:
https://answers.launchpad.net/yade/+question/258336
Bruno Chareyre proposed the following answer:
I mean, no without changing the code (of course). I guessed it was the question.
B
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Question #258034 on Yade changed:
https://answers.launchpad.net/yade/+question/258034
Bruno Chareyre proposed the following answer:
The definition of contact parameters is done by the Ip2 functor, this is where
you can find the equations.
See:
https://yade-dem.org/doc/yade.wrapper.html?highlight
Question #257855 on Yade changed:
https://answers.launchpad.net/yade/+question/257855
Bruno Chareyre posted a new comment:
FYI, I started playing with Palabos with exactly the objective in mind...
We should definitely talk to each other!
Back to the question. I think your approach can work
Question #257855 on Yade changed:
https://answers.launchpad.net/yade/+question/257855
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hello,
You could embed python in c++
(https://docs.python.org/2/extending/embedding.html) and hope that no problem
will happen
Question #257388 on Yade changed:
https://answers.launchpad.net/yade/+question/257388
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hello,
IMHO seeking Nc5 for sphere packings is unphysical, hence not possible with
DEM.
There are so many other parameters
Question #257388 on Yade changed:
https://answers.launchpad.net/yade/+question/257388
Bruno Chareyre posted a new comment:
Of course compacting spheres before clumping leads to arbitrary large Nc
depending on the number of spheres per clump, but I'm not really sure that
clumps will give Nc5
Question #257388 on Yade changed:
https://answers.launchpad.net/yade/+question/257388
Bruno Chareyre proposed the following answer:
CohFrictPhys_CohesionMoment (this law is quite similar, mine has the
extra feature of normal inelasticity)
For the sake of accuracy:
I would say
Question #257061 on Yade changed:
https://answers.launchpad.net/yade/+question/257061
Bruno Chareyre posted a new comment:
We need to see that with a script maybe. For the moment I don't
understand the problem.
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Question #257278 on Yade changed:
https://answers.launchpad.net/yade/+question/257278
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Is there a way to apply a periodic boundary conditions to only one of
the boundaries
Do you mean something like the top boundary
Question #257058 on Yade changed:
https://answers.launchpad.net/yade/+question/257058
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi,
There are misunderstandings. Sorry if I was not clear previously.
To quote answer #1 more completely:
they will have very large
Question #257061 on Yade changed:
https://answers.launchpad.net/yade/+question/257061
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi Hicham,
I think it is a feature of uniaxialStrainer to allow lateral deformations, not
a bug.
This behavior actually minimizes
Question #257058 on Yade changed:
https://answers.launchpad.net/yade/+question/257058
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Would there be a way to do this? What would I do with unp?
Again:
i.phys.unp = i.phys.penetrationDepth [...]
to get null forces
Question #257058 on Yade changed:
https://answers.launchpad.net/yade/+question/257058
Bruno Chareyre posted a new comment:
The elastic force is kn*(penetration-unp), that's why.
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Question #256715 on Yade changed:
https://answers.launchpad.net/yade/+question/256715
Bruno Chareyre posted a new comment:
it is difficult to stimulate the earthquake waves
Stationary waves are periodic, propagating waves are not (at least in
the general case). So periodic BCs may or may
Question #256283 on Yade changed:
https://answers.launchpad.net/yade/+question/256283
Bruno Chareyre posted a new comment:
It is easily avoided in most cases by using a corner. A quick fix for
now.
Do you mean that you implemented this fix? I'm curious to know how you
did that.
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Dear all,
For those of you interested, the collection of slideshows from the 1st
YADE Workshop in Grenoble is available at the adress below.
I hope you will enjoy browsing it!
https://www.yade-dem.org/publi/1stWorkshop/booklet.pdf
Best regards.
Bruno Chareyre
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Question #256357 on Yade changed:
https://answers.launchpad.net/yade/+question/256357
Bruno Chareyre proposed the following answer:
PyRunner(command='addForceEver()',iterPeriod=1)
The above makes no sense. If the force is applied forever, why would we
reapply at each iteration? It is only when
Question #256106 on Yade changed:
https://answers.launchpad.net/yade/+question/256106
Bruno Chareyre proposed the following answer:
How good is yade when it comes to coupling it with CFD?
DEM+CFD is partitionned approach where most of the time is spent for
either pure CFD or data exchanges
Question #255725 on Yade changed:
https://answers.launchpad.net/yade/+question/255725
Status: Open = Answered
Bruno Chareyre proposed the following answer:
At least the vtk you attached is well formed.
Paraview - open - apply
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Question #255677 on Yade changed:
https://answers.launchpad.net/yade/+question/255677
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi, the list is in [1] but the website is down at the moment. Hopefully
i will be back today.
Bruno
[1] https://yade-dem.org/wiki
Question #255699 on Yade changed:
https://answers.launchpad.net/yade/+question/255699
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi Anna,
How do your compilation options look like?
What is the output of cmake?
B
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Question #255520 on Yade changed:
https://answers.launchpad.net/yade/+question/255520
Status: Open = Answered
Bruno Chareyre proposed the following answer:
On 09/10/14 03:07, Sebastian Pucilowski wrote:
shows my deviatoric stress overshooting their reported value by 100kPa[5],
Do you have
Question #255199 on Yade changed:
https://answers.launchpad.net/yade/+question/255199
Bruno Chareyre posted a new comment:
On 01/10/14 09:31, Christian Jakob wrote:
afaik you have set both factors to 1.2 (aabbEnlargeFactor and
interactionDetectionFactor) for correct implementation.
Correct.
B
Question #254747 on Yade changed:
https://answers.launchpad.net/yade/+question/254747
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Off-topic (sorry), but... don't save in xml, it kills your HD and it
takes a lot of time.
O.save(test.yade), or in compressed version
Question #254986 on Yade changed:
https://answers.launchpad.net/yade/+question/254986
Status: Open = Answered
Bruno Chareyre proposed the following answer:
On my side I'm trying to understand why top-bottom direction is more
confusing for you than the other directions. ;)
Check the yellow
Question #254953 on Yade changed:
https://answers.launchpad.net/yade/+question/254953
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Every shapes can be used in clumps. I don't see any restriction.
B
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Question #254705 on Yade changed:
https://answers.launchpad.net/yade/+question/254705
Bruno Chareyre proposed the following answer:
Yes.
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Question #254732 on Yade changed:
https://answers.launchpad.net/yade/+question/254732
Status: Open = Answered
Bruno Chareyre proposed the following answer:
No, I don't think so.
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Question #254640 on Yade changed:
https://answers.launchpad.net/yade/+question/254640
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi,
Most of the constitutive relations are described in Bourrier2013 [1].
The law is more general than what you'll find in the paper
Question #254625 on Yade changed:
https://answers.launchpad.net/yade/+question/254625
Bruno Chareyre proposed the following answer:
Hi,
You can get a volume associated to each sphere based on a tesselation
(see e.g. https://yade-dem.org/doc/user.html#micro-stress).
From this volume it is trivial
Question #254528 on Yade changed:
https://answers.launchpad.net/yade/+question/254528
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Dear Ziyi,
What you ask is not possible at the moment, sorry.
Bruno
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Question #247823 on Yade changed:
https://answers.launchpad.net/yade/+question/247823
Status: Open = Needs information
Bruno Chareyre requested more information:
Hello Hicham,
Does yade-daily work?
What if you compile fresh source code without adding your contact law?
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Question #247823 on Yade changed:
https://answers.launchpad.net/yade/+question/247823
Bruno Chareyre posted a new comment:
Why do you checkout sources in version 1.10.0? This is unusual - though
not wrong.
Could you try master?
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Bug #1362090 status changed in Yade:
New = Confirmed
https://bugs.launchpad.net/yade/+bug/1362090
problem with pressure calculation in PFV cells
This bug is linked to #253562.
PFV compressibility in undrained triaxial test
https://answers.launchpad.net/yade/+question/253562
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Question #253483 on Yade changed:
https://answers.launchpad.net/yade/+question/253483
Status: Open = Needs information
Bruno Chareyre requested more information:
So?
Removing those lines solved your problem?
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Question #253483 on Yade changed:
https://answers.launchpad.net/yade/+question/253483
Status: Needs information = Answered
Bruno Chareyre proposed the following answer:
What is that?
b.state.mass=1.0e20*b.state.mass
You don't find this in the example.
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I see, thanks.
Side note: refSize should have larger sizes in x and y, otherwise you
will have an array of mills in contact with each other.
Bruno
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Question #253296 on Yade changed:
https://answers.launchpad.net/yade/+question/253296
Bruno Chareyre posted a new comment:
I see, thanks.
Side note: refSize should have larger sizes in x and y, otherwise you
will have an array of mills in contact with each other.
Bruno
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Question #253425 on Yade changed:
https://answers.launchpad.net/yade/+question/253425
Bruno Chareyre proposed the following answer:
stress recorder averages for each body the normal stress or shear stress of
all interactions associated to this body.
It needs to assign a cross section to each
Question #253425 on Yade changed:
https://answers.launchpad.net/yade/+question/253425
Bruno Chareyre proposed the following answer:
For completeness, the above convolution is not right if particles have
different sizes. In that case the volume of bodies should be used for
weighting the stress
Question #253483 on Yade changed:
https://answers.launchpad.net/yade/+question/253483
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Looking at your script fragment, I don't understand what you are trying
to do.
There is an example of use in examples
Question #253483 on Yade changed:
https://answers.launchpad.net/yade/+question/253483
Status: Open = Needs information
Bruno Chareyre requested more information:
And I write the script according the example
Is that a new script? Because the above is not like in the example.
If it is a new
Question #253577 on Yade changed:
https://answers.launchpad.net/yade/+question/253577
Status: Open = Answered
Bruno Chareyre proposed the following answer:
https://yade-dem.org/doc/user.html#imposed-force
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Question #253399 on Yade changed:
https://answers.launchpad.net/yade/+question/253399
Bruno Chareyre posted a new comment:
So if I understood well, it is not a bug
Right, it is a feature!
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Question #253296 on Yade changed:
https://answers.launchpad.net/yade/+question/253296
Bruno Chareyre posted a new comment:
Hello,
in consequence, the sample has to be translated in function of the
boundary box position
I am still not sure what you mean... The box is just a window in which
you
Question #251218 on Yade changed:
https://answers.launchpad.net/yade/+question/251218
Bruno Chareyre proposed the following answer:
I was away from keyboard. Sorry for slow reply Behzad.
I think you can keep the 3 variables of CohFrictPhys even if you don't need
them. It is harmless
Question #253112 on Yade changed:
https://answers.launchpad.net/yade/+question/253112
Bruno Chareyre proposed the following answer:
Maybe python is just never erasing the vector that you pass from fortran to
c++. I remember it can happen sometimes than python is not releasing memory as
you
Question #253112 on Yade changed:
https://answers.launchpad.net/yade/+question/253112
Bruno Chareyre requested more information:
Now I see this (after [1]):
HydroForceEngine.vxFluct = X
Just a trivial thing: can you check len(HydroForceEngine.vxFluct) and len(X)
just after this line
Question #253112 on Yade changed:
https://answers.launchpad.net/yade/+question/253112
Bruno Chareyre posted a new comment:
This is how to reproduce your bug...
for k in range(1000):
e.ids=range(0,100)
then watch yade eating the RAM...
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Question #253257 on Yade changed:
https://answers.launchpad.net/yade/+question/253257
Bruno Chareyre posted a new comment:
I suspect the problem is in the generator, not in the distribution.
In other words, Box-Muller based on std::default_random_engine would be bad as
well.
I guess you have
Question #251218 on Yade changed:
https://answers.launchpad.net/yade/+question/251218
Bruno Chareyre posted a new comment:
Another thing: it is better and easier to put all classes (Material, Ip2, Ig2,
Law2, etc.) in the same pair of .hpp/.cpp files.
No need to have 10 files for one contact law
Question #251218 on Yade changed:
https://answers.launchpad.net/yade/+question/251218
Bruno Chareyre posted a new comment:
Dear Behzad,
It seems you decided to give the copy/paste method a go (option 3 in #1).
Please keep in mind that it is only a quick hack for testing equations.
If you want
Question #252063 on Yade changed:
https://answers.launchpad.net/yade/+question/252063
Status: Open = Answered
Bruno Chareyre proposed the following answer:
Hi Christian.
Your suggestion is possible. It needs to skip clump members when
building the triangulation, and insert clumps as spheres
Question #251510 on Yade changed:
https://answers.launchpad.net/yade/+question/251510
Bruno Chareyre proposed the following answer:
I would suggest to try a much simpler test case. E.g. try to move just
one spherical particle in a granular bed.
The problems are mostly conceptual it seems
Question #251470 on Yade changed:
https://answers.launchpad.net/yade/+question/251470
Status: Open = Answered
Bruno Chareyre proposed the following answer:
It is not possible currently.
What you want to achieve is very unusual.
What is the physical situation?
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