LIGGGHTS® - User Forum

I am a beginner and trying to figure my way around liggghts. I am using 3x materials (1x big particle, 1xsmall particle, 1xbin). As the particles are of difference sizes which command do I use to define the different particle sizes and how would this affect the neighbour lists.

thanks in advance for your help.

Hi,

I am trying to download and install liggghts. I went to the download page and it was written that we need to register/login to have access to download. But even the, I am unable to find a download section.

Please help me out.

Thank You,
Yesaswi

Hi every one....!
i am trying to simulate a mixer that contain glass beads with impeller in the middle.I am a new user of LIGGGHTS, i don't know how to make geometries for this setup.I means which components to be made in CAD?? which CAD software is to be used ???currently i made a vessel and impeller in PRO E and saved in STL format.when i use this then vessel geometry does'nt import nd i get problem with this.

I attached my input file also here,please any who have idea about this,kindly help me

Hi All,

I just want to have clarity on this one.

We have 2 materials say m1 & m2 (peaches and oranges) and they are conveyed on conveyor belt which is boundary material, b1. We have 5 possible interactions here i.e (m1-m1), , (m2-m2), (m1-m2=m2-m1), (b1-m1) and (b1-m2).

Hi,

Good morning,

I am writing because I have a little doubt.

Can you guarantee that the results of a LIGGGHTS simulation are INDEPENDENT FROM THE NUMBER OF CORES used for its parallelization?
This should be at the basis of every code.

Hi All,

I want to tilt the geometry as initially shown on 1 in the attached file with first fix command.

fix d_feed all mesh/surface file meshes/drop_feed.stl type 1 move 0.0 0.0 0.0 rotate axis 0.0 0.0 -1.0 angle 0.0 curvature 1e-6

After doing the below command to rotate the geometry, it positions as 2 yet I just want it to tilt at its centroid in position 1.

fix d_feed all mesh/surface file meshes/drop_feed.stl type 1 move 0.0 0.0 0.0 rotate axis 0.0 0.0 -1.0 angle 45.0 curvature 1e-6

Kindly help on how I can do this.

Im working for the simulation of metal hydride particles in a container. The particle size is of the order 100 micron and the cylindrical container has a radius of 12mm and 20mm height. Can u suggest a proper insert/rate/region command, velocity etc.. for this particular situation. I need to find the container wall stresses. Please help me to prepare the syntax. Im a beginner in liggghts.

Hi,

I am using glued-spheres particles to do my simulations and I want to calculate the contact forces between these glued-sphere particles.

I know I can get the contact forces between individual spheres using 'compute 1 all pair/gran/local' command but I want to treat one glued-sphere particle as a single entity and when two glued-spheres will be in contact there will be multiple spheres from both the glued-spheres in contact. I want the summation all the forces acting on the individual spheres for that contact pair.

Hi all,