LIGGGHTS® - User Forum

I try to visualize the speed of a running solver. To do this I want to dump into a CSV file for example the elapsed time since the first run and the current time steps. This CSV file can be visualized and periodically updated (e.g. with gnuplot or LiveGraph) to estimate the required time to finalize the simulation and to see the change of the simulation speed.

Hej guys.

I need to use the "move/mesh mesh cad rotate/variable" command because I can spezifiy angular velocity.

My problem:
A)
variable omega equal 2
fix bewegung all move/mesh mesh cad rotate/variable origin 0 0 0 axis 0 1 0 omega ${omega}

B)
variable omega equal 2
fix bewegung all move/mesh mesh cad rotate/variable origin 0 0 0 axis 0 1 0 omega omega

C)
fix bewegung all move/mesh mesh cad rotate/variable origin 0 0 0 axis 0 1 0 omega 2

Hi everyone,

We are attempting to install LIGGGHTS in ALTIX ICE 8400 EX SUPERCOMPUTER

Hi,

has someone an idea how to fix this problem?

My challenge is it to move a wall/gran/hertz/history (complex geometry) through a region full of particles to compute the resulting force onto the wall.
I need the force for further calculations in MatLab.

Some ideas?

Regards
hansmannb

hi,
i am working on finding the porosity of soil , in that
my volume of the atom or grain changes at certain
timestep. i want to know how to compute the changing
volume in liggghts ?
thanks in advance,
Dixon

I am experimenting with Amazon EC2 to see if I can get some significant wins in LIGGGHTS running time. I've tried a variety of datasets, and I seem to be encountering some sort of slow down beyond 24 CPUs.

My bigger test dataset I'm running is conveyor a simulation. At the end of the 10 second run, there are around 200k particles. The path the particles travel is quite narrow, but oblique, meaning the simulation is highly sensitive to processor partitioning because there are large empty spaces in the simulation box

hi,
i am working on porosity of the soil sample. i have attached the input script with this .
Please help me with this error ERROR: Fix insert/pack (id ins): unknown keyword (fix_insert_pack.cpp:106).

Hi,
I faced a weird problem in my simulation and it is that when I use "gran/hertz/history" as a pair_style my simulation work precisely, but when change the pair_style to "gran/hertz/history cohesion sjkr" my simulation does not work and it leads to the following messages repeatedly.

"touching neighbour atoms found, growing contact history"

I would appreciate it if anyone help me to solve this problem.

Sincerely,
Rasoul

Dears,
I can compile liggghts with gpu packages and I think it works but I can't compile it with user-cuda.
After the compiling of liblammpscuda.a in lib directory, if I try "make machine" I obtain this error:

pair_gran_hooke_cuda.cpp: In member function ‘void LAMMPS_NS::PairGranHookeCuda::allocate()’:
pair_gran_hooke_cuda.cpp:95:39: error: ‘kn’ was not declared in this scope
pair_gran_hooke_cuda.cpp:96:39: error: ‘kt’ was not declared in this scope
pair_gran_hooke_cuda.cpp:97:39: error: ‘gamman’ was not declared in this scope