LIGGGHTS® - User Forum

Hello, although tbe vtk superquadric visualizer is available , it shows the soft ellipsoids as interpenetrated, while maintaining their shape. Is there away to visualize the deformed the ellipsoid at the point of contact?

Hi.

Hello,
I am facing one grave problem. The values of coordination number and energy values per atom is not correct. It is showing very very less values.
Kindly see the code once and help me with this problem as early as possible.

atom_style granular
atom_modify map array
boundary f f f
newton off

communicate single vel yes
processors * * *

units si

region reg block -0.01 0.35 -0.01 0.1 -0.01 0.15 units box
create_box 2 reg

I'm writing the command: write_dump all mesh/vtk meshfile*.vtk stress vel stresscomponents area

This command worked in previous versions when it was mesh/gran/VTK and I've corrected it to mesh/vtk, but I'm still getting errors with this command that are indicating the keywords are wrong. What is the correct way to do this in version 3.8?

Hello Mschramm,

As we discussed in the previous forum about particles repeated id, I found that particles id are repeated in my SIlo silulation.

I still didn't check the LIGGGHTS examples.

I converted all dump files in a csv file by using python. I tried to plot particles after 400000 or 500000 steps(rowsin csv) which is almost at the end of simulation. I was expecting all the particles will be on the floor but I found that some of the particles are still hanging on the top of the silo.

Is it because I didn't use delete atoms comand?

Hello,
Please find my code below. I am simulating a problem in which particles are allowed to enter in a column and then of the column's gate is removed to create a flow. I am losing atoms after certain trials of insertions. This is reflected in the post processing (Paraview) as particles vanish from the column during insertion.
#Simple granular column collapse

atom_style granular
atom_modify map array
boundary f f f
newton off

communicate single vel yes
processors * * *

units si

Hello Mschramm,

Apologies for many questions.

I have been doing simulation in Silo with liggghts. I have one more question about particles filling.

This is how I have been generating particles and inserting :
```
###################################Generation and Insertion of the particles#########################################

#distributions for insertion

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++.