LIGGGHTS® - User Forum

Hallo everyone,

is there a way to identify what the time limiting step in the simulation is? What consumes most of the time (e.g creation neigbour list, etc )?

Cheers

Johannes

Hello

I'm using the following lines to read the coordinates and some properties of different particles.

Atoms # Atom-ID, Atom-type, Diameter, density, x, y, z

1 1 0.025 2500 0. 0. 0.20
2 2 0.005 2500 0. 0. 0.215
3 2 0.01 2500 0.0125 0. 0.225
4 2 0.01 2500 -0.0125 0. 0.225

Although it works well, I don't know how the program knows the order of the properties. ??? Is there a section on the documentation to see the order of the properties?

Thanks

Hello,

Hello everyone,
I'am a beginner in this filed, I need to select a research topic for my one year MS research project on hoppers using DEM on LIGGGHTS. Can anyone help me with some idea to get a start with my research work. Or kindly suggest me some latest research papers which may have some future recommendations regarding DEM studies on hoppers.

Regards: Fabeeha

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