LIGGGHTS® - User Forum

Hi all,

I found that the simulations become very slow when the input particle size ratio is very high (Rlarge/Rsmall = 30).
How do I improve computational efficiency?
Did anyone successfully apply "neighbor skin multi" ? and comm multi ?

Best
Che

I've been trying to use the superquadric example in LIGGGHTS. I get the following errors:

Hello, I am trying to install LIGGGHTS in Ubuntu 16.04LS. Please help, I have been trying to install it for over 5 weeks. Autoinstall VTK did not work so I manually installed VTK 8.1 with MPI on. I can see the vtk include files and the several vtk library files in my computer. However when I try to compile LIGGGHTS, it gives me the following error -
```
Creating list of contact models completed.
make[1]: Entering directory '/home/toral/LIGGGHTS-PUBLIC/src/Obj_auto'
Warning: MPICXX compiler is g++-5 but CXX=g++. Thus, setting OMPI_CXX to g++.

Hey,
I'm supposed to optimize an existing simulation. I noticed that Reading STL comes an "error/warning" that.

Reading STL file 'Meshes/MitAussen.stl' (mesh processing step 1/3)

Appologies for posting such qestion here.

Has any one applied LEBC or done equivalent simulation in LIGGGHTS?
If yes, could I get some hint about applying such condition?

I checked about deform and triclin box applications but still stuck in their implementaion.
If anyone has such example and it is okay to share, Could you kindly provide link here?

Thank you

Please help, the installation guide asks me to contact a "local expert" but I've looked on my classifieds and there tragically is no LIGGGHTS expert in town. I'm trying to install and compile (make auto) LIGGGHTS on my MacOS 12.1 and receive this error -
"""
sed: illegal option -- -
usage: sed script [-Ealnru] [-i extension] [file ...]
sed [-Ealnu] [-i extension] [-e script] ... [-f script_file] ... [file ...]
Creating list of contact models completed.

Hi,

I want guidance related to setting up plane poiseuille flow with LIGGGHTS.

I've added "fix 9 all addforce 0.1 0.0 0.0"
Can anyone give me some guidance to proceed furthur ?

I'm attaching my input file here

"
atom_style granular
atom_modify map array
communicate single vel yes

boundary p f f
newton off

units si

region reg block 0 0.4 0 0.1 0 0.1 units box
create_box 1 reg

neighbor 0.001 bin
neigh_modify delay 0

Hello All

I am wondering if it is possible to restrict the motion of one particle type and seconds not?

Hello,
Need small help here.

I am trying to do simulation in Silo.
I am trying to insert 2 types of particles with fraction 0.5 and 0.5. But particle 1 is inserted more than particle 2. It seems particle 1 is inserted almost 80%.

Can I get hint what did I miss here ?

My script file is attach here.

Hoping for some help.

Thank you.

Hello all,
While compiling the src in LIGGGHTS-Public, I am getting the following error.

/usr/bin/ld: warning: libmpi.so.12, needed by /usr/lib/x86_64-linux-gnu//libvtkParallelMPI-6.2.so, not found (try using -rpath or -rpath-link)
size ../lmp_auto

Can anybody please help me with this issue?
Thanks in advance.

Regards,
Tarun