LIGGGHTS® - User Forum

I am working on building irregular particle mixtures and then importing the geometry to a finite element software.

I ran the "multisphere_stone_restitution" example, but the result is two particle clusters rather than two surfaces wrapping the clusters.

How to generate a surface which can wrap the cluster?

I attached my expected results which are generated from PFC.

Hi,

While running simulations on HPC with multiple nodes, simulations are taking around 12hrs for 2crore time steps loop. Tried with 1024 cores , 640 cores etc.,
Each node has 16 cores and 64 gb ram.
Is there any command needs to be added in script file or any module missing in PBS file?

Please have a look at the attached files.

Dears,

Would you please inform me

what is the command for vibrating screen media?

Thanks in advance

Hi everyone. I'm attempting to simulate some granular problems (1~10M number of particles) , mostly silo storage kind-of.

So, I have some questions about the server (or compute node) that I should use for that amount of particles.

Which specs should I use in my compute node?

* Memory (seems not so important, so I think 64 GB could be OK.)
* Processors (Intel Gold 10 cores dual socket?)
* Storage (10 TB?)
* GPU?

Thanks in advance, any advice would be really helpful!

Juan.

Hi

I was wondering whether there is a list of all the coefficients and their characteristics we can use with the command "fix property/global" because I haven't been able to find it in the Online Documentation. Such as:

youngsModulus
poissonsRatio
coefficientRestitution
coefficientFriction
k_finnie
cohesionEnergyDensity
FluidViscosity
CriticalStokes

Thanks

Hi,

Running a job with single node (16 cores) was successful but when I am using more than one node, job is running but only with 16 cores the load on the rest of cores was 0.
Module loaded was openmpi-1.6.4 .This module was used while installing LIGGGHTS along with FFTW & HDF5.
I don't know whether the reason for this could be with my script file or with module or etc,
Can you please help me in this regard. I am attaching my PBS script file below.

Regards,
Shiva

Hi,

I am recently seeking for how to exert periodic boundaries using LIGGGHTS, but I cannot find anything in the online documentation. As I know, this function can severely reduce the calculation time and improve our simulation efficiency. Could anyone familiar with this function give us some clues? Thanks ahead!

Best regards,
Rachel

Hi everyone,
I am new user of LIGGGHTS and have less knowledge about this tool.
I need help for my MS project.
I want to melt down the solid particles (spherical particles) in bucket or while flowing in pipe and then pour this molted material into dye to form required shape solid particle by cooling.
Means phase change occurs from solid to liquid and then to solid from liquid.
Is it possible in LIGGGHTS or not? If yes, than please help me that how can I proceed it?
Thanking you in anticipation.

When running a simulation using LIGGGHTS-WITH-BONDS the bonds break and I don't know how to fix it. I am trying to simulate the indentation of a bonded granular material. I would like to have a purely linear model where bonds don't break at all so I set the breakage tension to a very high value (this worked in the bondspackage/sphere example)

Hello,

Is it possible to create a multiple face wall without using stl CAD file?

Thanks.