LIGGGHTS® - User Forum

Hi everyone,

I was tried to install the superquadric model using the "make serial" command. The makefile has been modified to add the superquadric model. However, when compiling the executable file, it appeared the following error:

I have created a container that contains particles in Liggghts using the sph-method. This container should move in an axial direction via the “wiggle” command.

So I want to let move a surface that is defined as a wall with fix wall/region/sph with the command “wiggle”.

These two commands do not work:

fix wall all wall/region/sph myWall 0.01 2.5 wiggle amplitude 2. 0. 0. period 0.5

fix wall all wall/region/sph myWall 0.01 2.5 wiggle 2. 0. 0. 0.5 units box

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