LIGGGHTS® - User Forum

Hi all,

I have the objective to modify the neighbor class in order to load a neighbor list via a text file. I need your opinion to do this in compliance with the previous developments in LIGGGHTS. The interest is to extend LIGGGHTS to perform lattice beam simulations.

Therefore:
I am thinking to add a new style : enum{NSQ,BIN,MULTI,TXT} in the files : neighbor.cpp and neigh_list.cpp

I am thinking to add a new request: int latthistory in the file neigh_request.cpp

Hi,

I am creating spheres so that they initially intersect with walls. I get the following message

WARNING: Dangerous build in triangle neighbor list.

What is the consequence of this? I am getting a memory error I don't understand and I wonder if this is the reason...

Thanks for all the help,
George

Hi all,

I want to simulate a granular flow in a shear cell. Therefore I have a axis-symmetric geometry. To save computing time I want to simulate only a quarter of the ringshaped geometry by using quarter periodic boundary conditions in angular direction. Is there a possibility to use such a boundary condition in the current build?

Thanks
Yansan

Dear LIGGGHTS developers,

I looked several times under the download section for the git address of LIGGGHTS download, but, could not find it. Could you please tell me where I find the git address? Thanks!

Pei-Ying

Hi all,

I wonder if it is possible to introduce a directional bond between particles. Unlike cohesion, Im looking for some kind of bonding which is effective when there are contacts only in specific directions of the particles.

Thanks,

Ozgur

question:

fix 1
run 1000 upto

unfix 1
fix 2
run 2000 upto

unfix 2
fix 1
run 3000 upto

unfix 1
fix 2
run 4000 upto

unfix 2
fix 1
run 5000 upto

repeat ..

I want to know what command or skills may use for the alternate cycle as above example. Welcome any suggestion or advise.

thank you in advance.

best regards,
xinze

Hi all,

I have a question- Am I correct in assuming that there can only be one meshgran wall in a simulation?
If yes I have a slightly complex situation- I have a cube bounded by 6 flat surfaces in which I have my granular sample. I want to move the top surface only AND measure separately forces on the top, bottom and side surfaces.

Hello Christoph!

I ran into a problem using three atom_types -- two for particles and one for the walls -- which leads to my question:

Hello Christoph,

I wonder which commands can complete the reduction of particle diameter over time in a specified region just as you have gived example lammps_particleReduction_.wmv in this web. I think it is maybe lammps's some command or tips, Could you kindly give me help or instruction?

Thank you.

best regards,

leexz

Hi,

When I use
pair_style peri/lps for the pair style, I get this error:
ERROR: Invalid atom style

I wonder if it is possible to use this pair style with LIGGGHTS or not.

Thanks,

Ozgur Keles