LIGGGHTS® - User Forum

We seem to have developed a segmentation fault on our CENTOS 8 system. Everything was working fine, then all of a sudden we started getting seg faults on our scripts. I've tried downloading a fresh copy of LIGGGHTS and recompiling with $make auto, and I've reinstalled openmpi and openmpi-devel, but we're still getting the same faults. I'm unable to even run the examples. Has anyone had a similar problem?

output from running cohesion :

Hi
I am doing triaxial test simulation. I want to use radius expansion method to prepare initial configuration of particle. Is there any such command in LIGGGHTS.
I am using LIGGGHTS 3.7.0 version

Hi Everyone,

Is there anyway to get ONLY the pair contact stresses without considering the kinetic energy contribution and others ?

I have used the compute stress/atom , but this includes the other contribution of stresses as well as mentioned in the doc.

Thanks

Khan

Hello,

I am trying to read a dump file to start a new simulation using the atom locations and velocities from a previous simulation.

I am using the compute cluster/atom with a distance of 10 times the radius of my atoms. However, I am getting an error because my cluster/atom cutoff is longer than my pairwise cutoff distance.

I have two questions:
1) How do I increase the pairwise cutoff distance?

2) Will I run into potential errors by increasing the pairwise cutoff distance to a much larger value?

Dear all
I am using the following command to dump the particle information. I am interested total force acting on the particle including weight of particle and all interaction forces. For this I am using the following command.

------------------
dump dmp all custom/vtk ${nstep} post/two_wall/particle_*.vtk id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
----------------

The above command dumps the value of forces as zero for most of the time. I am NOT sure about what LIGGGHTS is dumping as fx fy fz

I am trying to fill the annular zone but unable to do. i have followed the instructions given but unable to do. please help me to resolve the issue.

Hi,

Dear all,
I am doing triaxial test and I want to know average force on the wall. The average force must be result of vector addition. For this I am using the following command.

------------------------------------------------
fix force1 all ave/time 1 1000 1000 f_twall_servo[1] f_twall_servo[2] f_twall_servo[3] file graph_run2/force_twall.dat mode vector
----------------------------------------------------

But it is giving me an error:

Is it possible to assign a different template to a different group of atoms?
And how to create a different set of atoms for the same