LIGGGHTS® - User Forum

I'm trying to investigate how the different rolling friction models in LIGGGHTS effect my simulations. My initial simulation used the cdt model for the particles and walls, and I wrote restart files to prevent me from having to run multiple simulations from the very beginning.

However, when I change the rolling_friction model on the wall/gran fixes, I get an error:

ERROR: Fix contacthistory/mesh (id tracker_mesh1): saved simulation state used different contact history model - can not restart (../fix_contact_history.cpp:528)

Hi,

I wondered if there exists a way of coupling a solid model created in OpenFOAM, which solves the wave equation to a DEM model created in LIGGGHTS? The physical situation is a pipe filled with powder and the solid pipe is vibrated to fluidize the powder. The particle phase is dry (no effect of interstitial fluid) but the powder is affected by the vibrations of the solid model through the motion of the boundary, which changes throughout the solid part and depends on the frequency of vibration.

Kind regards,

Andrew

Can I compile liggghts on a Windows-7 ?
Can somebody provide the procedure for the same?

Thanks,
GAJ

I see the new release has an additional flag that applies to the rolling friction models, the "torsionTorque" flag. I'm having trouble trying to visualize what the "normal torsion" actually is. Could you provide a more in-depth explanation (pictures are helpful!) or provide an article that explains it?

Hi everyone

what are different shapes available other than sphere and cluster of sphere?
how can we define in liggghts?
if it is possible to create a quadric surface or superquadric surface in public version?,if possible please tell the command...

with regards
DINESH KUMAR

Hello,

I wondered if anyone can give me the instructions to install the latest version of LIGGGHTS on Ubuntu 16.04 LTS?

Kind regards,

Andrew

How do you use the fflag and tflag options in fix particletemplate/multisphere? I'm getting an "unknown keyword" error when I use it as follows:

fix particle_template all particletemplate/multisphere 608519 atom_type 1 density constant 1 nspheres 1000 ntry 100000 spheres file template_file.multisphere scale 1.0 type 1 mass 10 inertia_tensor 100 0. 0. 100 0. 100 use_volume fflag off on on tflag on off off

hi every one

i have a clarification in walls
how to assign wall property like density,friction etc....
some detail about fix wall/gran command

with regards
dinesh kumar

hello everyone
I met a problem when trying to add package molecule, a similar thread was post last year but with no answers, as below:

i am very new to this software and also very new in the field of particle simulation. I am planing to do the Nanoindentation simulation through LIGGGHTS. Therefore i need to create a bond model, which is only possible through the MOLECULE package.

I have tried to install this package but it is showing some error. I have tried to do it in two steps, as mentioned in LIGGGHTS online document.

I noticed that atom_style bond/gran cant be recognized. The online documentation says "Note that bond/gran is an experimental code which is may not be available in your release of LIGGGHTS. An example for the sytnax is given below". I am wondering when it will be available to the public version user. Is this new atom_style for membrane boundary?