LIGGGHTS® - User Forum

Is there a way to increase the precision in my dumped files? When I use the write_dump command, it only outputs data up to 6 significant figures. I have a simulation with over 1 million clumps, and I need to know the id's of each clump. So after the 1 millionth clump, the id number rounds to the nearest 10. I am dumping .txt files, so maybe there's a better file format I could use? Or is it a LIGGGHTS issue?

Hi All,

Is there a way to collect and dump the collision energy loss between different contact types in LIGGGHTS? I am simulating a grinding mill, and intend to calculate the energy loss between the particle and the CAD geometry after they collide

Thanks for your help.

Will

Hi
I am new user if LIGGGHTS and I am trying to do simulation but I am getting error. I am using the given error

fix cad1 all mesh/surface/stress file meshes/isgec1.stl type 1 scale 0.001 curvature 1e-05 wear finnie

Dear all,

Now, I have settled down all particles on the surface (large size distribution and shape distribution) and begin to start the simulation from the restart file.

I set the gravity as the Y direction and want to make particles only move in x-y plane. But I do not know how to let particles do not do any motion in z direction. It seems that fix/setforce does not work.

Are there any suggestions?

Looking forward to your kind help. Thank you very much in advance.

Best wishes,
Solient

With LIGGGHTS 3.8.0 the script below returns the error

"ERROR on proc 0: Random number generation: It is required that the random seed value is > 10000 and a prime number.
The random seed used was 38914"

What's happening? The random seed provided is not 38914, that's the number of particles! Is it a bug?

Hi there,
I was trying to run one of the LIGGGHTS examples: LIGGGHTS/Tutorials_public/ParScale/heatTransferBed_paScale/.
I installed the ParScale following the instructions and no error appears .
When i trying to run LIGGGHTS/Tutorials_public/ParScale/heatTransferBed_paScale/Allrun_convective, the following error apppears:

Total # of neighbors = 73
Ave neighs/atom = 0.09125
Neighbor list builds = 1
Dangerous builds = 0
ERROR: Invalid fix style: "couple/pascal" (../modify.cpp:850)
data2Plot = heat.json

Hi,

Hi all,

Just wondering if there is a way to directly specify values for normal and tangential elastic constants and viscous damping constants in an input script. If there is could someone direct me to the documentation where this is explained or an example script showing how someone has done this would be awesome.

Regards,

Alex.

Hi all,

I am a little confused about one issue: In liggghts, we can output the stress of the an atom using command "compute stress/atom". If we introduce the seepage force into the simulation using CFDEM engine, e.g. drag force, buoyant force. Does the calculated stress of atom include these seepage force, or it only includes the particle-particle and particle-wall interaction force?

Thank you very much.
Zheng

Hello all,

I would like to ask whether LIGGGHTS can be used for modelling continuous materials ? For example, modelling tensile test of aluminium specimen, then compare the stress-strain diagram with experimental data. Has anybody had experience with it ?

Thank you.
Vinh