Re: [Yade-users] [Question #295158]: Can we create a rigid body using only particles, rather than importing a gts surface.

[A Dinesh]

Question #295158 on Yade changed:
https://answers.launchpad.net/yade/+question/295158

Status: Answered => Solved

A Dinesh confirmed that the question is solved:
Thanks Anton Gladky, that solved my question.

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Re: [Yade-users] [Question #295218]: Can't load the Launchpad of Yade

[Henry]

Question #295218 on Yade changed:
https://answers.launchpad.net/yade/+question/295218

Status: Answered => Solved

Henry confirmed that the question is solved:
Every this i ok.
Thanks a lot!

Henry

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Re: [Yade-users] [Question #295158]: Can we create a rigid body using only particles, rather than importing a gts surface.

[Anton Gladky]

Question #295158 on Yade changed:
https://answers.launchpad.net/yade/+question/295158

Anton Gladky proposed the following answer:
2016-06-13 19:22 GMT+02:00 A Dinesh :
> As I am trying to write my own code to implement DEM, please suggest me which 
> visualization tool kit should I use to visualize the spheres, Box, and rigid 
> bodies as they move with time? Thank you sir.

That is what that I would strongly not recommend to do. There are many
open source DEM codes, which you can use as a basis, if YADE is not
suitable for your needs (just google it). Many thousands of man-hours were
spent by many people polishing programs, trying to do them bug-free.
Writing the new code from the scratch is not always a good idea.

Regards

Anton

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Re: [Yade-users] [Question #295158]: Can we create a rigid body using only particles, rather than importing a gts surface.

[Marcus Moravia]

Question #295158 on Yade changed:
https://answers.launchpad.net/yade/+question/295158

Marcus Moravia proposed the following answer:
Dear Dinesh,

I suggest open a new topic for new questions (https://yade-
dem.org/wiki/Howtoask). In spite of that, I answered your questions
below.

1) "As Jérôme Duriez explained that we could create a model using spheres. 
After such creation, should we apply the force law between sand particles and 
hopper's spherical particles?"
You should handle sphere+sphere collisions. Thus, you will need to set 
collision geometry, collision physics and contact law to apply forces.

2) "This is another question:
As I am trying to write my own code to implement DEM, please suggest me which 
visualization tool kit should I use to visualize the spheres, Box, and rigid 
bodies as they move with time? Thank you sir."
You may use the Primary View directly from Yade.

Cheers,
Marcus.

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Re: [Yade-users] [Question #295158]: Can we create a rigid body using only particles, rather than importing a gts surface.

[A Dinesh]

Question #295158 on Yade changed:
https://answers.launchpad.net/yade/+question/295158

A Dinesh posted a new comment:
Sir, I want to create a hopper. Then visualize the sand falling  through
it.  In YADE hopper is made of facets, and the force interaction law,
insertion sort collider, and many things are different  if we create the
same hopper with particles.

1) As jérôme Duriez  explained that we could create a model using
spheres. After such creation, Should we apply the force law between sand
particles and hopper's  spherical particles?


This is another question:
As I am trying to write my own code to implement DEM, please suggest me which 
visualization tool kit should I use to visualize the spheres, Box, and rigid 
bodies as they move with time? Thank you sir.

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Re: [Yade-users] [Question #295218]: Can't load the Launchpad of Yade

[Bruno Chareyre]

Question #295218 on Yade changed:
https://answers.launchpad.net/yade/+question/295218

Bruno Chareyre proposed the following answer:
It was down for a few hours indeed, then fixed before Jérôme tested it.
B

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Re: [Yade-users] [Question #295158]: Can we create a rigid body using only particles, rather than importing a gts surface.

[Bruno Chareyre]

Question #295158 on Yade changed:
https://answers.launchpad.net/yade/+question/295158

Bruno Chareyre proposed the following answer:
> A ball made up of spheres, bouncing in a box, which is also made of
spheres. Bullet made up of spheres hitting a concrete wall composed of spheres.

Yes of course, you can dot that. Why not?
Could you clarify your question?
Bruno

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Re: [Yade-users] [Question #295225]: Cohesion Distribution

[Jérôme Duriez]

Question #295225 on Yade changed:
https://answers.launchpad.net/yade/+question/295225

Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hello,

The doc of "CohFrict.." related classes should help, here (assuming
you're using such contact model, which would probably be a good idea)

1. See [1], together with [2], to understand how the interaction
strength ("normalAdhesion" and "shearAdhesion" of "CohFrictPhys") is
computed from grains with possibly different strength material
properties ("normalCohesion" and "shearCohesion" from CohFrictMat)

2. It is the default behaviour of the "CohFrict.." model to define purely 
frictional interactions (without cohesion), see setCohesionNow and 
setCohesionOnNewContacts in [1]
In particular keeping setCohesionOnNewContacts to False will do exactly what 
you want.

3. I'm not sure I understood your question. All contact models in Yade
consider a "fmin" threshold for the normal force fn (I'm considering
here compression as positive). This "fmin" threshold in Newton is
usually never directly set, though (see previous answers for the
"CohFrict.." model)

As for a maximum compressive force threshold "fmax" I'm not aware any
contact law in Yade considers such thing. If this is what you want, you
will probably have to write your own contact law.


Jerome


[1] 
https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Ip2_CohFrictMat_CohFrictMat_CohFrictPhys
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.CohFrictPhys

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Re: [Yade-users] [Question #295158]: Can we create a rigid body using only particles, rather than importing a gts surface.

[Jérôme Duriez]

Question #295158 on Yade changed:
https://answers.launchpad.net/yade/+question/295158

Status: Open => Answered

Jérôme Duriez proposed the following answer:
As for your first example, getting a box made of spheres should be quite easy 
using "predicates", see for instance
https://yade-dem.org/doc/user.html#boolean-operations-on-predicates
and the previous paragraphs.

This predicate method should allow you to get particles assemblies
conforming a wide variety of shapes and address hopefully any situation
you want.

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Re: [Yade-users] [Question #295218]: Can't load the Launchpad of Yade

[Jérôme Duriez]

Question #295218 on Yade changed:
https://answers.launchpad.net/yade/+question/295218

Status: Open => Answered

Jérôme Duriez proposed the following answer:
Me, I currently do not have any problem accessing the pages you
mentioned. Do you still face these problems ?

(These web pages are rebuilt on a regular basis and may be from time to
time--not often--down for a short time period, for various reasons.
Usually the best is to wait a little..)

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[Yade-users] [Question #295225]: Cohesion Distribution

[Seti]

New question #295225 on Yade:
https://answers.launchpad.net/yade/+question/295225

Hi All,

Would you please let me know, how can can model a cemented - 100% bonded - 
sample with three different material which have different level of cohesion. 

 In other words  if all of the grains connected to each other - very dense 
sample - how the force/strength/cohesion (?) between neighbourhood grains with 
different material properties  will be calculated on YADE.

2- If contacts between some spheres during the compression test re-appeared. 
how can I write the script to prevent  taking into account  the cohesion 
between these particular spheres. 

3- How can I introduce limitation for implying force, I mean, implying fn on 
sample, where fmin

Re: [Yade-users] [Question #295170]: Problem with MatchMaker

[Jonathan Pergoli]

Question #295170 on Yade changed:
https://answers.launchpad.net/yade/+question/295170

Jonathan Pergoli posted a new comment:
Thank you!

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Re: [Yade-users] [Question #295170]: Problem with MatchMaker

[Anton Gladky]

Question #295170 on Yade changed:
https://answers.launchpad.net/yade/+question/295170

Status: Open => Answered

Anton Gladky proposed the following answer:
Hi,

I caused this bug during MatchMaker refactoring, sorry. It was fixed yesterday 
[1].
Yadedaily will be updated tonight.

[1]
https://github.com/yade/trunk/commit/e2e5a4cfbcf8bdd62d17c30637c299804a1b02af

Regards

Anton

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