LIGGGHTS® - User Forum

Hello,

Hi all,

I like to insert continuously multispheres particles into my LIGGGHTS run by defining is as a molecule, but I saw that the commands used by LAMMPS to do so are not the same in LIGGGHTS, so, I was asking myself, if I want the same command as LAMMPS, could it be enough to take the function in LAMMPS and then just change the function in LIGGGHTS (for example for fix pour)? if not how should I do?

Thanks all

Hi everyone,

I'm trying to pour a certain number of particles over different bodies and shapes.

The problem is that when I visualize the results of the simulation in paraview I don't know how paraview sets the origin of coordinates for the .stl body.

I was also trying to figure out where the .stl body is located when I run the simulation in liggghts? Is there a default position?

Thank you for your attention,
Jonathan.

Hi,

I have been working on a project regarding compressing and tensile of a solid material.

I had not any problem in compressing part and I utilize "fix X1 all mesh/surface/stress/servo" to do that and the results is perfect.
My problem is in tensile part. When I utilize the previous commend for tensile in one direction, there is no tensile is observed. I implement "Fix move/mesh" for tensile in that direction, but I could not observe any tensile.

I want to know if it is possible to model tensile using LIGGGHTS.

Hi everybody,

i am trying to parallelize the LIGGGHTS calculation, but it seems that it doesn't work with "mpirun -np 8 liggghts in.script"
In the "in.script" i placed the command "Processors 2 4 1" to divide domain into subdomains.

The error i got is:

Hi everybody,

I met some problems on displaying particle in paraview. In my modeling, I have two types of particles. When I postprocess the vtk data in paraview. In 'Coloring' category, I choose 'type'. But the two type particles display the same color. I check the vtk file and there are two types there. Can anyone help to explain why? Besides, how can display particle in real size? Thanks.

See picture below.
The left port is fed with type 1 particle and the right port is fed with type 2 particle

Hi,
I am trying to perform a simulation with the pair style "hybrid/overlay" combining "hertz/stiffness" with "lj/cut" (see attached script)
However, the simulation crashes as soon as a particle touches a wall (this happens at timestep ~9400 in my simulation).
Does anybody have an idea what I am doing wrong in the script?
Note: The simulation runs fine if one removes the walls!
Thanks in advance!
Best
Eric

Hi all,
I am a new user of LIGGGHTS. I just could install it yesterday. righ now I am studying this program from examples.
My intention of using this program is to simulate dust sucking or powder sucking process from tray using some nozzle which can be moved above tray. I want to know whether this program can do it or not. Which topic or command should I focus on?
The example of the process is:
http://www.youtube.com/watch?v=pCB4zkhuKIU&feature=youtu.be
Thanks,
Krisda

A first time user. Encountered the following compiling problem:
--------------------------
>make serial
make[1]: Entering directory `/home/LIGGGHTS/src/Obj_serial'
g++ -O -DLAMMPS_GZIP -I../STUBS -I/usr/local/include/voro++ -c ../fix_tune_kspace.cpp
../fix_tune_kspace.cpp: In member function ‘void LAMMPS_NS::FixTuneKspace::update_pair_style(char*, double)’:
../fix_tune_kspace.cpp:238:48: error: no matching function for call to ‘LAMMPS_NS::Force::create_pair(char*&, char*&)’
../fix_tune_kspace.cpp:238:48: note: candidate is:

Hej guys,

i need for my further calculation the exact forces that take effect on my mesh cause by the granular.

I use the "dump mesh/vtk face stresscomponents" and get dumpfiles like this example:

>>> ...
CELL_DATA 168
VECTORS stress float
9960.909201 -132.616586 -27273.516696
0.000000 0.000000 0.000000
0.000000 0.000000 0.000000
-24516.993439 -42.767019 -5969.508000
-6635.700348 130.843939 -2145.554848
-4538.977929 415.493448 -1099.923739
... <<<