LIGGGHTS® - User Forum

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,

Dear all,

I am using the servo wall model in version 3.3.

I have a bottom wall and a top wall, the particles are between them.

As the first test, I let the bottom wall far away from the particles, and the condition of it is:

mesh/surface/stress/servo meshes/bottom.stl type 1 stress on com 0 0 0 ctrlPV force axis 0 0 1 target_val 10 vel_max 0.01

because there is no contact between the particles and the bottom_wall, I assume the movement of the bottom wall should be:

Hello all,

I am using compute_stress/atom ke pair. And in Documentation it is mentioned that it doesn't include the contribution of average velocity in kinetic energy contribution. Is there a simple method to include that as well in stress calculation? So right values of stress which will be dumped.

Thanks in advance.

pnkumar

I am learning to use liggghts with tutorial examples.
The example of continuous blending mixer does not go through compiling and always gives an error of:

I am learning to use liggghts with tutorial examples.
The example of continuous blending mixer does not go through compiling and always gives an error of: