Different particle shapes

I saw some interesting commits from Jan a couple of weeks ago [1],
[2]. He (or his student) has implemented polyhedrons. You can have
a look there.

[1] https://github.com/yade/trunk/commit/eec1c9995b5d31549b872354c127b9526f4649a5
[2] https://github.com/yade/trunk/commit/edb5e0d185f8389ba808db9314ecd9d6afa3a3b5

Anton

Hello,

Just to clarify the situation, Jan Elias (the author of polyhedra
implementation) is my collegue and member of Brno University of Technology.
If I studied there, I could be his student, not vice versa :-)

Back to the question, another option is to use clumps composed of spheres
[1]. The suitable approach depends on what you want to simulate and what
you expect from the simulations.

cheers
Jan

[1] yade/examples/clumps directory

2013/10/29 Anton Gladky <email address hidden>

> Question #238270 on Yade changed:
> https://answers.launchpad.net/yade/+question/238270
>
> Status: Open => Answered
>
> Anton Gladky proposed the following answer:
> I saw some interesting commits from Jan a couple of weeks ago [1],
> [2]. He (or his student) has implemented polyhedrons. You can have
> a look there.
>
> [1]
> https://github.com/yade/trunk/commit/eec1c9995b5d31549b872354c127b9526f4649a5
> [2]
> https://github.com/yade/trunk/commit/edb5e0d185f8389ba808db9314ecd9d6afa3a3b5
>
> Anton
>
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> You received this question notification because you are a member of
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I want to make some number of particles(like 3 spheres and the center one having a radius R and the other two spheres having radiuses equal and less than R) inside a container and perform compression on it.

the 3 spheres are joint that is their centers pass through a straight line and it as a whole behaves as a single particle

Hi,

by "as a single particle" do you mean perfecly rigid, or deformable
particle? In case of rigid particle, clump (se my previous answer) is what
you are looking for, in case of deformable particle you can use some
cohesive contact laws.
cheers
Jan

2013/10/29 Abhineet Agarwal <email address hidden>

> Question #238270 on Yade changed:
> https://answers.launchpad.net/yade/+question/238270
>
> Abhineet Agarwal gave more information on the question:
> the 3 spheres are joint that is their centers pass through a straight
> line and it as a whole behaves as a single particle
>
> --
> You received this question notification because you are a member of
> yade-users, which is an answer contact for Yade.
>
> _______________________________________________
> Mailing list: https://launchpad.net/~yade-users
> Post to : <email address hidden>
> Unsubscribe : https://launchpad.net/~yade-users
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It is a normal particle just rather than individual particle the three spheres together form a particle that is they remain joint throughout the experiment but can be deformed. And for ellipsoid it can be deformed and can move.

If someone wants to port the code to Yade, there are true ellipsoids in Woo (http://woodem.eu) -- http://www.youtube.com/watch?v=cBnz4el4qX8 .

@Vaclav
Beautiful, and good to know. Are they arbitrary ellipsoids with 3
different semi-axes lengths? or axial-symmetric ellipsoids?
B

@Bruno (sorry for late answer) - their semiAxes can be arbitrary (not negative, though - to have other particles inside ;) ).