LIGGGHTS® - User Forum

Hey community,

i would like to insert 3 atom types:

1, material : cylinder surface of a rotating drum material steel

2. material : front and back covered with plexiglas / acrylic glass

3. material: particle zinc oxide

We have values for particle-steel and particle-plexiglas (Jenike Shear cell)

How do I have to set up these parameters, that I can handle these 3 different materials ? Which values are needed to be set up ?

Hello,

I'm trying to compile/install LIGGGHTS latest version but I'm having problem with the MPI.

I've set the following in [...]/LIGGGHTS-PUBLIC/src/MAKE/Makefile.user:
USE_MPI = "ON"
MPICXX_USR=/home/dventuri/intel/compilers_and_libraries_2018.2.199/linux/mpi/intel64/bin/mpicxx
MPI_INC_USR=/home/dventuri/intel/compilers_and_libraries_2018.2.199/linux/mpi/intel64/include/
MPI_LIB_USR=/home/dventuri/intel/compilers_and_libraries_2018.2.199/linux/mpi/intel64/lib/

Hi,

Dear all,

I am trying to define cylindrical walls in LIGGGHTS directly in order to circumvent imported meshes with lots of triangles. I am not using primitive types in the fix wall/gran command because so defined cylinders are not limited in axial direction which does not fit to my geometry.

So this is what I did:

I defined the region with the region command:
region region_furnace_tube_A cylinder z 0.1 0 0.025 0 0.412

Hi,

I'm using 3.8.0 version of LIGGGHTS and when I tried the same input file in another machine it worked

but not in this machine. I really want to find out the reason for this error.

I got errors like "ERROR on proc 6: Fix insert: Region volume calculation with MC failed (../fix_insert_pack.cpp:210)".

I attached the files so you can see the errors.

Can someone help me?

hello,

i am having difficulty dumping the stress on each element on a mesh.

In the link (https://www.cfdem.com/media/DEM/docu/dump.html) an example command is given:
"dump dmpAllMeshes mesh/vtk 100 mesh*.vtk stress wear"

This seems to be different to the syntax in that the group ID is missing, (dump ID group-ID style N file args), and I do in fact get the error message stating 'ERROR: Could not find fix group ID (../modify.cpp:780)'.

Hello Community,

I am quite new to LIGGGHTS but I'll give it a trial.

I am going to simulate particles (metal particles or sand) in a rotating drum with DEM and ontop there should be the heat transfer and conduction from particle-particle and particale-wall. These particles are bulk materials and have a temperature from 1000-1400 °C. The aim is cool down the particles to approx. 150 °C.
The rotating drum is cooled indirect with water from the outside

Hi,

I am looking for advice on how to implement deformable particle behavior in LIGGGHTS.

I have already read the forum posts here:
https://www.cfdem.com/forums/using-separate-contact-behavior-unloading-v...
https://www.cfdem.com/forums/which-atomstyle-choose

I perform a simulation with big moving meshes and about 200000 particles and write out restart files regularly at the end of a simulation run. The files have more than 100 MB. LIGGGHTS is called from a bash script and sometimes the simulation crashes with the error

"SIGINT/SIGTERM caught - Writing restart on next occasion and quitting after that."

Hello,

I am running a code using the following contact model:

pair_style gran model hertz tangential history rolling_friction epsd2