LIGGGHTS® - User Forum

I perform a simulation with big moving meshes and about 200000 particles and write out restart files regularly at the end of a simulation run. The files have more than 100 MB. LIGGGHTS is called from a bash script and sometimes the simulation crashes with the error

"SIGINT/SIGTERM caught - Writing restart on next occasion and quitting after that."

Hello,

I am running a code using the following contact model:

pair_style gran model hertz tangential history rolling_friction epsd2

Hi all,

I have a simulation to run for 1 minute of real time in H.P.C. A simulation runs for only 2 days in H.P.C.
In two days 58.9 seconds of simulation completed and cpu time left for remaining seconds was around 36000 seconds (10hrs). Expecting the simulation to be completed in 10 more hours I restarted simulation from 58.9 and I see cpu time left getting doubled.
Is there any mistake in my restart file (inhopperhpc2) attached below.
I am using LIGGGHTS 3.7.0.

Hi,

I'm compiling using LIGGGHTS using cfdemCompLiggghts. I have a custom installation of VTK-6.3.0 and I edited the VTK_INC_USR and VTK_LIB_USR in the Makefile.user to point to the location.

All compilation process goes well, but at the last step, when creating the lmp_auto.o file, I am getting the following errors:

Hey everybody,

Hello users,

Hi,

I now have output the vtk file for my liggghts code's results. In my code, I have two types of particles with different size, i.e. d=1mm and 2mm. Because I want to see the movement of the particle with d=1mm. Does anyone know how to visulize only particles with d=1mm in PARAVIEW while the other one is invisible? Thanks ahead.

Best,
Rachel

I have to simulate particles with size less than or equal to 1 micron. When I give radius in input script file as 0.000001, I get run time error i.e. volume_limit is exceeded , change the limit. I change the volume_limit in fix_template_sphere .cpp file and build the liggghts again. But it doesn't work out properly while running the script with new volume limit as expected.

Is there any specific for this much particle size?

Govind

Hi there, LIGGGHTS forum. I've been learning to use LIGGGHTS, and I'd like to run a simulation where moving parts stay still and move at specific intervals. Maybe somewhat like the 'pulsed' behavior that's possible by using the duration keyword with the insert_every keyword of the insert/stream fix.

I imagine I could accomplish this by using a repeating pattern of commands like:

run ... upto
fix all spinner move/mesh ...
run ... upto
unfix spinner

Hello,

I have seen similar questions posted from quite a while back (https://www.cfdem.com/forums/restart-heat-transfer-simulation) but still I can't see how to do this successfully.

In the first .in file I use heat/gran to run a heat conduction simulation, with this:

fix heattransfer temp_group heat/gran initial_temperature 200