LIGGGHTS® - User Forum

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.

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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.

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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

Lastest version of LIGGGHTS in Windows 10

While doing Triaxial test. I have first applied confining pressure (200k) on all 6 wall and then applied fix modify command to modify the target value for top and bottom wall so that additional deviator stress can be applied.

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fix twall_servo all mesh/surface/stress/servo file meshes/sample_4/topwall.stl type 2 com 1.0 1.0 4.0 ctrlPV force axis 0.0 0.0 1.0 target_val -${f_top} vel_max ${vel} kp ${kp1}

run 500000 # run for confinment

fix_modify twall_servo servo/target_val -${f1_top}

Hi all,

I am new to LIGGGHTS and aspire to learn more about using DEM. I am using Windows 10 and have used various methods to install LIGGGHTS. I have managed to build LIGGGHTS with the instructions from Christian:
https://www.cfdem.com/forums/alternative-cmake-build-environment

I am running Cygwin in Windows and was trying to run this command just now:
$ make -f Makefile.shlib auto

But I get the following error:

Hello every one

I am trying to run bonded particle simulation but I am getting an error

----------------------------------------------------------------------
ERROR: Invalid atom_style command (../atom_vec.cpp:75)
--------------------------------------------------------------------------

#bond

atom_style hybrid granular bond/gran n_bondtypes 1 bonds_per_atom 6
#atom_style granular
atom_modify map array
boundary f f f
newton off

#processors 2 1 1

communicate single vel yes

units si