non-spherical granular simulation

Submitted by zamir on Wed, 04/25/2012 - 08:31

Hello,

I was watching the non-spherical pouring movie in the 'features' section. I was wondering where I could find an input file example for that. I don't seem to see it in my examples folder...

Thanks!
Zamir

Forums:

Philippe's picture

Philippe | Wed, 04/25/2012 - 08:46

Hello Zamir,

to my knowledge, the multisphere method is not yet released because it is still in the process of testing and validation.

Philippe

zamir | Wed, 04/25/2012 - 21:48

I may be able to help with testing and validation. I have recently started a phd project and I was going to likely write a class that combines ellipsoidal and granular particle atom and pair styles. If the multisphere approach is available, it would save me a lot of time, as well as provide validation to the multisphere approach. If any developer is reading this and is interested, reply to this post and perhaps we can get in contact.

ckloss's picture

ckloss | Mon, 04/30/2012 - 15:40

Multisphere is not released - as all new features, it will be highlighted in the release notes when the time has come.

Cheers,
Christoph

moosabbad | Tue, 12/04/2012 - 16:32

Hi to All,
I would like to simulate flexible fibers, and I don't know if the mulstisphere option is released or not? Is there any one who is simulation non-spherical particle?

ckloss's picture

ckloss | Wed, 12/05/2012 - 18:43

You could try to extend the existing fix rigid to account for flexible fibers. This is a problem we haven't touched yet, but have plans for this for the future

Christoph

keepfit | Mon, 12/17/2012 - 08:46

Hi Christoph,

I did the similar work with another DEM code by clumping overlapping spheres together.

Since the feature is not yet available, it is possible to bond a group of non-overlapping but contacting spheres together as a rigid body or breakable body using the existing packing generation?

Liggghts packing generation.

keepfit | Tue, 12/18/2012 - 22:19

not the Cogency's code, but the Itasca PFC3D in which clump (group of overlapping spheres acting as rigid body) and cluster (bonding non-overlapping spheres together and can be broken ) are supported.

In Liggghts , is it possible to cluster spheres together as a non-sphere particle by using fix rigid?

MfG

Long

ckloss's picture

ckloss | Tue, 12/25/2012 - 16:15

Hi Long,

>>In Liggghts , is it possible to cluster spheres together as a non-sphere particle by using fix rigid?
yes, but fix rigid does not allow overlapping particles (wrong intertia tensor). At the moment, the multisphere feature in is currently available in a collaboration partner version of LIGGGHTS.

As that question already arose a couple times, we'll announce a list of features with a release schedule in the first term of 2013.

Cheers, Christoph