LIGGGHTS® - User Forum

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.

I'm trying to compile LIGGGHTS 3.8.0 in CentOS with MPI and without VTK. I used the same process as for Fedora in the documentation, but using yum instead of dnf. Everything seems to be compiling alright, but then when it gets to the end and spits out all the *.o it says

/usr/bin/ld: cannot find : no such file or directory
collect2: error: ld returned 1 exit status

However, when I go to /usr/bin there is an ld there.

Does anyone know what's going on?

Hello everyone

Can anyone suggest a method for inserting particles of range 50-100 micrometer in to a cylindrical container until the container is full.

Thanks in advance
Jyothish

Hello everyone,

If one tries to find official installation instructions for liggghts and goes through the CFDEM website, i.e., LIGGGHTS --> Installation, then this leads to "https://www.cfdem.com/installation". On this website, a link to the official documentation is provided. However, no relevant information can be found in the linked part of the documentation [1].

It would be great, if there was actual, official information about liggghts' installation.

Dear all,
I am doing a research on triaxial test in soils. In my simulation, I have two process, i.e. consolidation and shear process. I want to use the coefficient of friction f=1.0 during consolidation while use f=0.5 during shear process. I haven't found any command about changing this coefficient during simulation. Could anyone please give me a clue about how to realize this function?

Hello all,
I want to replace a large particle with two smaller particles if the contact force exceeds a fixed value (for simulation of particle breakage). Any suggestions how to do it?

I have used the fix break_particle in LIGGGHTS 2.3, but I could not successfully compile that version of LIGGGHTS in CFDEM coupling. So, I decided to find another way to simulate the particle breakage in a CFD-DEM simulation.

Regards,
Shahab

Hello everyone,

I am doing a simulation about triaxial compression test using Liggghts, and I am wondering if there is any command for us to obtain the instant porosity or void ratio so that we can output them into a txt file?

Any suggestion or clue is greatly appreciated!

Best regards,
Rachel