LIGGGHTS® - User Forum

Hi

Can someone assist me on how I can insert particles into a fixed volume so that I achieve a desired bulk density. Are there any insertion related variables that I can play around with?

Regards

I think this is issue is related to the previous post by Zhenli, but I don't want to hijack that forum post with my own issue. I am trying to simulate a direct shear test with mesh walls and 11700 multisphere particles (log file attached). The multisphere particles are actually spherical consisting of one sphere of smaller diameter within another sphere since multisphere templates of only one sphere are not allowed. The simulation runs to completion without an error being thrown, but partway through the simulation the total number of particles suddenly drops.

Dear all,

I am just by testing the multisphere method in LIGGGHTS3.6.0. The case was very simple, the multisphere particle consists only two particles.
some thousands of multispheres were simulated. A moving stl wall was available in the simulation.
What I found was, the single simulation went no problem, but the parallel simulation has a "explosion" of particles after 3-5 timesteps first at the boundary of each sub-domain.

Is this problem known and are there some methods to overcome this problem?

Thanks a lot!

best regards

Zhen

Dear All, I've running binflow simulation available at LIGGGHTS Tutorial and couldn't understand the meaning of insert_every option of insert/rate/region fix.

I have to run a few simulations quite similar to this one implemented in the binflow example, and then went through the input file reviewing the documentation of each command used (by the way, this and other examples are very illustrative, congratulations).

This is the command I have in the input file:

Has the "info" command been removed? I keep getting errors saying unknown command whenever I try to call this, even when I just use the examples for this command shown in the documentation.

Well, this is a basic test.
But, it does not work.
Here is the in file:

#particle distributions and insertion
fix pts1 all particletemplate/sphere 15485863 atom_type 1 density constant 8000 radius constant 0.005
fix pts2 all particletemplate/sphere 15485867 atom_type 1 density constant 8000 radius constant 0.0025
fix pts3 all particletemplate/sphere 15485867 atom_type 1 density constant 8000 radius constant 0.001

fix pdd1 all particledistribution/discrete/numberbased 32452843 3 pts1 0.3 pts2 0.5 pts3 0.2

Hi all,

I have some problems when trying to set a following symbolic link for LIGGGHTS as mentioned in the installation guideline. After running the "make fedora" command, I got "Obj_fedora" as a return in the /Home/LIGGGHTS-PUBLIC/src directory instead of "lmp_fedora. Can anyone help me with this? Appreciated for your help.

Hi

I am facing a challeng in visualising my simulation results properly in Paraview. I am only seing point particles instead of the full spherical shapes. As such all particles sizes visually look the same since they are points. May someone assist on how i can visualise the particles such that they are not points.

Thanks

I am trying to simulate a direct shear test that has 12 mesh walls each with 2 triangles. The upper and lower walls are used to compact the specimen, so their position and velocity change. I have two fix mesh/surface/stress/servo commands and ten fix mesh/surface/stress commands. I am trying to use a write_restart command after the compaction stage so I can restart more simulations without having to repeat the compaction process. How do I save the particle configuration as well as the mesh configuration and then load both of them into a new simulation?

hallo everyone,

Can anyone explain to me, why Fix heat/gran/conduction is maybe not valid for pair style hybrid/overlay?

"Fix heat/gran/conduction implementation may not be valid for pair style hybrid/overlay"

Best wishes

Johannes