Yade

issue about irregular shape generation

Asked by De zhang

Sir, I am working on a project about granulars with irregular shapes----ballasts which used on train track ballast bed. The shape has great influence on the mechanical behavior of ballast bed. So I want to simulate the irregular shape of ballast precisely. As common methods using finite number of spheres bonded up to generate irregular shape granular like PFC3D, but it still can't accurate describe the contact relation between ballasts as it still relies on the Hertz contact theory between ball to ball.
So I have a question that does YADE can generate the polyhedrons instead of cluster of balls bonded up?
As different from spheres, the contact detection and calculation between polyhedrons have to redifined. So does YADE have the contact algorithm between polyhedrons? or new contact algorithm could the be writen into the procedure of YADE(the algorithm may take the non smooth contact method)?

Question information

Language:
English Edit question
Status:
Solved
For:
Yade Edit question
Assignee:
No assignee Edit question
Solved by:
De zhang
Solved:
Last query:
Last reply:
Revision history for this message
Jan Stránský (honzik) said : 		#1

Hello,
there are polyhedrons and contact between them implemented in Yade. have a
look at examples/polyhedra [1]. Also have a look at publications using this
implementation [2,3].

From its nature, the contact detection and evaluation is more time
consuming than sphere-sphere contacts.

I am not sure if I got last part of your question, but since Yade is open
source, you can redefine or write whatever you want.

cheers
Jan

[1] https://github.com/yade/trunk/tree/master/examples/polyhedra
[2] http://www.sciencedirect.com/science/article/pii/S0032591014005191
[3] http://congress.cimne.com/particles2013/proceedings/full/p103.pdf

2016-10-05 11:27 GMT+02:00 张德 <email address hidden>:

> New question #402779 on Yade:
> https://answers.launchpad.net/yade/+question/402779
>
> Sir, I am working on a project about granulars with irregular
> shapes----ballasts which used on train track ballast bed. The shape has
> great influence on the mechanical behavior of ballast bed. So I want to
> simulate the irregular shape of ballast precisely. As common methods using
> finite number of spheres bonded up to generate irregular shape granular
> like PFC3D, but it still can't accurate describe the contact relation
> between ballasts as it still relies on the Hertz contact theory between
> ball to ball.
> So I have a question that does YADE can generate the polyhedrons instead
> of cluster of balls bonded up?
> As different from spheres, the contact detection and calculation between
> polyhedrons have to redifined. So does YADE have the contact algorithm
> between polyhedrons? or new contact algorithm could the be writen into the
> procedure of YADE(the algorithm may take the non smooth contact method)?
>
>
> --
> You received this question notification because your team yade-users is
> an answer contact for Yade.
>
> _______________________________________________
> Mailing list: https://launchpad.net/~yade-users
> Post to : <email address hidden>
> Unsubscribe : https://launchpad.net/~yade-users
> More help : https://help.launchpad.net/ListHelp
>

Revision history for this message
De zhang (dzlearnyade) said : 		#2

great thanks for you!!!
I will learn detail from what you supplied~ thank you again~