LIGGGHTS® - User Forum

Hi,

Dear all,

I am trying to define cylindrical walls in LIGGGHTS directly in order to circumvent imported meshes with lots of triangles. I am not using primitive types in the fix wall/gran command because so defined cylinders are not limited in axial direction which does not fit to my geometry.

So this is what I did:

I defined the region with the region command:
region region_furnace_tube_A cylinder z 0.1 0 0.025 0 0.412

Hi,

I'm using 3.8.0 version of LIGGGHTS and when I tried the same input file in another machine it worked

but not in this machine. I really want to find out the reason for this error.

I got errors like "ERROR on proc 6: Fix insert: Region volume calculation with MC failed (../fix_insert_pack.cpp:210)".

I attached the files so you can see the errors.

Can someone help me?

hello,

i am having difficulty dumping the stress on each element on a mesh.

In the link (https://www.cfdem.com/media/DEM/docu/dump.html) an example command is given:
"dump dmpAllMeshes mesh/vtk 100 mesh*.vtk stress wear"

This seems to be different to the syntax in that the group ID is missing, (dump ID group-ID style N file args), and I do in fact get the error message stating 'ERROR: Could not find fix group ID (../modify.cpp:780)'.

Hello Community,

I am quite new to LIGGGHTS but I'll give it a trial.

I am going to simulate particles (metal particles or sand) in a rotating drum with DEM and ontop there should be the heat transfer and conduction from particle-particle and particale-wall. These particles are bulk materials and have a temperature from 1000-1400 °C. The aim is cool down the particles to approx. 150 °C.
The rotating drum is cooled indirect with water from the outside

Hi,

I am looking for advice on how to implement deformable particle behavior in LIGGGHTS.

I have already read the forum posts here:
https://www.cfdem.com/forums/using-separate-contact-behavior-unloading-v...
https://www.cfdem.com/forums/which-atomstyle-choose

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: