LIGGGHTS® - User Forum

Hi friends & colleagues.
In my simulation: boundaries are periodic. I want to (isotropic) compress the box until reaches 100,000 Pa using fix box/relax.
However, when I ran the code, there was no warning or error, but the box volume and pressure did not change. I have read the documentation LIGGGHTS but I can not fix it.
I am not sure whether I missed something. So, do you have any comments and advice to fix this point? Thanks

#The part of my script is:
fix integr nve_group nve/sphere

Hello everyone,

For past few weeks I have been trying to compile out my LIGGGHTS executable "lmp_auto" into a HPC cluster.

I have been using the following modules from software stack of the cluster:

1. module load compiler/openmpi/4.1.4 (For MPI based parallelization)
I am not using any version of GCC compiler as I assume that OpenMPI already has a parallel version of GCC wrapped inside itself.
2. module load compiler/cmake/3.22.5 (For configuring the downloaded VTK).

variable dia_NMC_1 equal 20
variable dia_NMC_2 equal .1
variable rad_NMC_1 equal ${dia_NMC_1}/2

# Create a big particle
create_atoms 1 single 10.05 10.05 10.05 # The coordination of the first particle

set atom 1 diameter ${dia_NMC_1}

# group for big particle
group big_particle type 1

# Create small particles on the surface of the big particle
variable num_small_particles equal 400000 # Adjust the number of small particles as needed

variable dia_NMC_1 equal 20
variable dia_NMC_2 equal .1
variable rad_NMC_1 equal ${dia_NMC_1}/2

# Create a big particle
create_atoms 1 single 10.05 10.05 10.05 # The coordination of the first particle

set atom 1 diameter ${dia_NMC_1}

# group for big particle
group big_particle type 1

Hello every body,

I'm new to this DEM field & I'm self learning . I want to simulate granular particle mass flow onto milling table of Vertical Roller Mill...So I want to know whether it is possible to simulate the mass flow rate & measure the variables. Thank you in advance.

Hello everyone,

For past few weeks I have been trying to compile out my LIGGGHTS executable "lmp_auto" into a HPC cluster.

I have been using the following modules from software stack of the cluster:

1. module load compiler/openmpi/4.1.4 (For MPI based parallelization)
I am not using any version of GCC compiler as I assume that OpenMPI already has a parallel version of GCC wrapped inside itself.
2. module load compiler/cmake/3.22.5 (For configuring the downloaded VTK).

Hello everyone,

For past few weeks I have been trying to compile out my LIGGGHTS executable "lmp_auto" into a HPC cluster.

I have been using the following modules from software stack of the cluster:

1. module load compiler/openmpi/4.1.4 (For MPI based parallelization)
I am not using any version of GCC compiler as I assume that OpenMPI already has a parallel version of GCC wrapped inside itself.
2. module load compiler/cmake/3.22.5 (For configuring the downloaded VTK).

dump dmp all custom/vtk 1000 post2/particle_*.vtk id type x y z vx vy vz
dump_modify dmp every 1000 format "%d %d %.16g %.16g %.16g %.16g %.16g %.16g"
This modify command not working. I want to modify my dump file precision value.

Hi everyone,
I am working on separating magnetic particles from nonmagnetic particles on a vibrating screen. I want to set up magnetic force in LIGGGHTS and see how the particles will behave under the influence of magnetic force. Can anyone suggest how can I develop magnetic field? Please note that I will be using non-spherical dry particles and I will not use any coupling technique.

Hi,
I am working on separating magnetic particles from non-magnetic particles in a vibrating screen. I want to simulate the influence of external magnetic field. Can anyone tell me how to add magnetic force command in LIGGGHTS? My simulation will deal with dry non-spherical particles and I wont use any coupling technique.

Best regards,
Nihal