LIGGGHTS® - User Forum

Hello,

I have a cylindrical mold and wish to simulate isostatic compaction of a powder within the mold. Is it possible to use the mesh/surface/stress/servo command to apply a force in a radial direction, such that the force is applied to the center of the mold?

Thanks

Dear Ladies and Gentlemen,

is it possible to create cubic or cylindrical particles and to assign to them the hertzian contact model with friction?

I would like to model the movement of a block or cylinder along a defined way and to analyze the velocity during this movement.

Best regards and thank you

Mateus Kostka

I'm trying to simulate a powder scraper to analyze the effects of moisture content by using the easo/capillary/viscous model. When I want to have a liquid content of 2% should I input 0.02 or 2.0? Another question: will my output files output forces as Newtons or dynes if I am using cgs units?

Hi

I was doing am impact simulation with multi-sphere particle(see figure below). I wanted a plot of Kinetic energy for each multi-sphere particle and for that I have used the following command

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compute ke_clump all ke/multisphere
dump dmp all custom/vtk ${nstep} post/particle_*.vtk id type mol x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius c_overlap c_ke_clump
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Dear Ladies and Gentlemen,

I plan to consider diffusion processes in Liggghts public to simulate sintering processes.

My idea is to modify the hertzian contact model. Is it possible to adjust this model with diffusion equations.

Does already exist a open source code to consider diffusion in Liggghts Public?

Best regards an thank you

Mateus Kostka

I am trying to simulate an ultrasound vibration effect on stuck particles on wall by using "fix move all move/mesh mesh cad1 wiggle" command. I know this line is not creating a wave vibration but still I would like to see if "wiggle" command can remove the particles from the wall if I use low amplitude with very high frequency. I use cohesion model to stick particles on the wall.

Hi all:
I want to calculate the friction mobilization index, which equals ft/ufn. I calculate it from the Interparticle contact information file, but I find that some contacts' index is larger than 1,this seems unreasonable. Can anyone help me ? Thanks a lot.
Best regards
Southeast

Hello all!

I'm writing my own code in 'C' for DEM modelling of granular flows.

How does the energy minimization work? Can someone please explain?

Regards.

Hello liggghts forum,

Is it possible to set timing while dropping particles? I mean I want to drop particle A1, and after few seconds I want to drop particle A2 and so on.

Right now I am using this command,
fix ins nve_group insert/pack seed 32452867 distributiontemplate pdd1 insert_every 1 overlapcheck yes all_in yes particles_in_region 1 region bc

Hi

I want to simulate bonded granular material. But LIGGGHTS-public version 3.8 does not support bonded contact. Is there any way by which I can use LIGGGHTS-public version 3.8 for simulating bonded material