LIGGGHTS® - User Forum

I am studying the granular flow on inclined plane with different angels. In my simulation, x is flow direction and z is perpendicular to the plane. On achieving the steady state, profile for velocity, volume fraction, shear rate, shear stress and pressure seems fine. But when profile for shear stress in direction perpendicular to the plane (in my case it is zz) and shear stress in xz direction are not in accordance with the profile obtained from the momentum balance equation.

As I am still trying to figure out why is this happening? Can anyone suggest to make it right?

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.